Merge branch 'akpm' (incoming from Andrew Morton)

Merge fixes from Andrew Morton:
 "A bunch of fixes and one simple fbdev driver which missed the merge
  window because people will still talking about it (to no great
  effect)."

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (30 commits)
  aio: fix kioctx not being freed after cancellation at exit time
  mm/pagewalk.c: walk_page_range should avoid VM_PFNMAP areas
  drivers/rtc/rtc-max8998.c: check for pdata presence before dereferencing
  ocfs2: goto out_unlock if ocfs2_get_clusters_nocache() failed in ocfs2_fiemap()
  random: fix accounting race condition with lockless irq entropy_count update
  drivers/char/random.c: fix priming of last_data
  mm/memory_hotplug.c: fix printk format warnings
  nilfs2: fix issue of nilfs_set_page_dirty() for page at EOF boundary
  drivers/block/brd.c: fix brd_lookup_page() race
  fbdev: FB_GOLDFISH should depend on HAS_DMA
  drivers/rtc/rtc-pl031.c: pass correct pointer to free_irq()
  auditfilter.c: fix kernel-doc warnings
  aio: fix io_getevents documentation
  revert "selftest: add simple test for soft-dirty bit"
  drivers/leds/leds-ot200.c: fix error caused by shifted mask
  mm/THP: use pmd_populate() to update the pmd with pgtable_t pointer
  linux/kernel.h: fix kernel-doc warning
  mm compaction: fix of improper cache flush in migration code
  rapidio/tsi721: fix bug in MSI interrupt handling
  hfs: avoid crash in hfs_bnode_create
  ...

Documentation/devicetree/bindings/video/simple-framebuffer.txt

+Simple Framebuffer
+
+A simple frame-buffer describes a raw memory region that may be rendered to,
+with the assumption that the display hardware has already been set up to scan
+out from that buffer.
+
+Required properties:
+- compatible: "simple-framebuffer"
+- reg: Should contain the location and size of the framebuffer memory.
+- width: The width of the framebuffer in pixels.
+- height: The height of the framebuffer in pixels.
+- stride: The number of bytes in each line of the framebuffer.
+- format: The format of the framebuffer surface. Valid values are:
+  - r5g6b5 (16-bit pixels, d[15:11]=r, d[10:5]=g, d[4:0]=b).
+
+Example:
+
+	framebuffer {
+		compatible = "simple-framebuffer";
+		reg = <0x1d385000 (1600 * 1200 * 2)>;
+		width = <1600>;
+		height = <1200>;
+		stride = <(1600 * 2)>;
+		format = "r5g6b5";
+	};

Documentation/rapidio/rapidio.txt

@@ -79,20 +79,63 @@ master port that is used to communicate with devices within the network.
 In order to initialize the RapidIO subsystem, a platform must initialize and
 register at least one master port within the RapidIO network. To register mport
 within the subsystem controller driver initialization code calls function
-rio_register_mport() for each available master port. After all active master
-ports are registered with a RapidIO subsystem, the rio_init_mports() routine
-is called to perform enumeration and discovery.
+rio_register_mport() for each available master port.
 
-In the current PowerPC-based implementation a subsys_initcall() is specified to
-perform controller initialization and mport registration. At the end it directly
-calls rio_init_mports() to execute RapidIO enumeration and discovery.
+RapidIO subsystem uses subsys_initcall() or device_initcall() to perform
+controller initialization (depending on controller device type).
+
+After all active master ports are registered with a RapidIO subsystem,
+an enumeration and/or discovery routine may be called automatically or
+by user-space command.
 
 4. Enumeration and Discovery
 ----------------------------
 
-When rio_init_mports() is called it scans a list of registered master ports and
-calls an enumeration or discovery routine depending on the configured role of a
-master port: host or agent.
+4.1 Overview
+------------
+
+RapidIO subsystem configuration options allow users to specify enumeration and
+discovery methods as statically linked components or loadable modules.
+An enumeration/discovery method implementation and available input parameters
+define how any given method can be attached to available RapidIO mports:
+simply to all available mports OR individually to the specified mport device.
+
+Depending on selected enumeration/discovery build configuration, there are
+several methods to initiate an enumeration and/or discovery process:
+
+  (a) Statically linked enumeration and discovery process can be started
+  automatically during kernel initialization time using corresponding module
+  parameters. This was the original method used since introduction of RapidIO
+  subsystem. Now this method relies on enumerator module parameter which is
+  'rio-scan.scan' for existing basic enumeration/discovery method.
+  When automatic start of enumeration/discovery is used a user has to ensure
+  that all discovering endpoints are started before the enumerating endpoint
+  and are waiting for enumeration to be completed.
+  Configuration option CONFIG_RAPIDIO_DISC_TIMEOUT defines time that discovering
+  endpoint waits for enumeration to be completed. If the specified timeout
+  expires the discovery process is terminated without obtaining RapidIO network
+  information. NOTE: a timed out discovery process may be restarted later using
+  a user-space command as it is described later if the given endpoint was
+  enumerated successfully.
+
+  (b) Statically linked enumeration and discovery process can be started by
+  a command from user space. This initiation method provides more flexibility
+  for a system startup compared to the option (a) above. After all participating
+  endpoints have been successfully booted, an enumeration process shall be
+  started first by issuing a user-space command, after an enumeration is
+  completed a discovery process can be started on all remaining endpoints.
+
+  (c) Modular enumeration and discovery process can be started by a command from
+  user space. After an enumeration/discovery module is loaded, a network scan
+  process can be started by issuing a user-space command.
+  Similar to the option (b) above, an enumerator has to be started first.
+
+  (d) Modular enumeration and discovery process can be started by a module
+  initialization routine. In this case an enumerating module shall be loaded
+  first.
+
+When a network scan process is started it calls an enumeration or discovery
+routine depending on the configured role of a master port: host or agent.
 
 Enumeration is performed by a master port if it is configured as a host port by
 assigning a host device ID greater than or equal to zero. A host device ID is
@@ -104,8 +147,58 @@ for it.
 The enumeration and discovery routines use RapidIO maintenance transactions
 to access the configuration space of devices.
 
-The enumeration process is implemented according to the enumeration algorithm
-outlined in the RapidIO Interconnect Specification: Annex I [1].
+4.2 Automatic Start of Enumeration and Discovery
+------------------------------------------------
+
+Automatic enumeration/discovery start method is applicable only to built-in
+enumeration/discovery RapidIO configuration selection. To enable automatic
+enumeration/discovery start by existing basic enumerator method set use boot
+command line parameter "rio-scan.scan=1".
+
+This configuration requires synchronized start of all RapidIO endpoints that
+form a network which will be enumerated/discovered. Discovering endpoints have
+to be started before an enumeration starts to ensure that all RapidIO
+controllers have been initialized and are ready to be discovered. Configuration
+parameter CONFIG_RAPIDIO_DISC_TIMEOUT defines time (in seconds) which
+a discovering endpoint will wait for enumeration to be completed.
+
+When automatic enumeration/discovery start is selected, basic method's
+initialization routine calls rio_init_mports() to perform enumeration or
+discovery for all known mport devices.
+
+Depending on RapidIO network size and configuration this automatic
+enumeration/discovery start method may be difficult to use due to the
+requirement for synchronized start of all endpoints.
+
+4.3 User-space Start of Enumeration and Discovery
+-------------------------------------------------
+
+User-space start of enumeration and discovery can be used with built-in and
+modular build configurations. For user-space controlled start RapidIO subsystem
+creates the sysfs write-only attribute file '/sys/bus/rapidio/scan'. To initiate
+an enumeration or discovery process on specific mport device, a user needs to
+write mport_ID (not RapidIO destination ID) into that file. The mport_ID is a
+sequential number (0 ... RIO_MAX_MPORTS) assigned during mport device
+registration. For example for machine with single RapidIO controller, mport_ID
+for that controller always will be 0.
+
+To initiate RapidIO enumeration/discovery on all available mports a user may
+write '-1' (or RIO_MPORT_ANY) into the scan attribute file.
+
+4.4 Basic Enumeration Method
+----------------------------
+
+This is an original enumeration/discovery method which is available since
+first release of RapidIO subsystem code. The enumeration process is
+implemented according to the enumeration algorithm outlined in the RapidIO
+Interconnect Specification: Annex I [1].
+
+This method can be configured as statically linked or loadable module.
+The method's single parameter "scan" allows to trigger the enumeration/discovery
+process from module initialization routine.
+
+This enumeration/discovery method can be started only once and does not support
+unloading if it is built as a module.
 
 The enumeration process traverses the network using a recursive depth-first
 algorithm. When a new device is found, the enumerator takes ownership of that
@@ -160,6 +253,19 @@ time period. If this wait time period expires before enumeration is completed,
 an agent skips RapidIO discovery and continues with remaining kernel
 initialization.
 
+4.5 Adding New Enumeration/Discovery Method
+-------------------------------------------
+
+RapidIO subsystem code organization allows addition of new enumeration/discovery
+methods as new configuration options without significant impact to to the core
+RapidIO code.
+
+A new enumeration/discovery method has to be attached to one or more mport
+devices before an enumeration/discovery process can be started. Normally,
+method's module initialization routine calls rio_register_scan() to attach
+an enumerator to a specified mport device (or devices). The basic enumerator
+implementation demonstrates this process.
+
 5. References
 -------------
 

Documentation/rapidio/sysfs.txt

@@ -88,3 +88,20 @@ that exports additional attributes.
 
 IDT_GEN2:
  errlog - reads contents of device error log until it is empty.
+
+
+5. RapidIO Bus Attributes
+-------------------------
+
+RapidIO bus subdirectory /sys/bus/rapidio implements the following bus-specific
+attribute:
+
+  scan - allows to trigger enumeration discovery process from user space. This
+	 is a write-only attribute. To initiate an enumeration or discovery
+	 process on specific mport device, a user needs to write mport_ID (not
+	 RapidIO destination ID) into this file. The mport_ID is a sequential
+	 number (0 ... RIO_MAX_MPORTS) assigned to the mport device.
+	 For example, for a machine with a single RapidIO controller, mport_ID
+	 for that controller always will be 0.
+	 To initiate RapidIO enumeration/discovery on all available mports
+	 a user must write '-1' (or RIO_MPORT_ANY) into this attribute file.

drivers/block/brd.c

@@ -117,13 +117,13 @@ static struct page *brd_insert_page(struct brd_device *brd, sector_t sector)
 
 	spin_lock(&brd->brd_lock);
 	idx = sector >> PAGE_SECTORS_SHIFT;
+	page->index = idx;
 	if (radix_tree_insert(&brd->brd_pages, idx, page)) {
 		__free_page(page);
 		page = radix_tree_lookup(&brd->brd_pages, idx);
 		BUG_ON(!page);
 		BUG_ON(page->index != idx);
-	} else
-		page->index = idx;
+	}
 	spin_unlock(&brd->brd_lock);
 
 	radix_tree_preload_end();

drivers/block/xsysace.c

@@ -1160,8 +1160,7 @@ static int ace_probe(struct platform_device *dev)
 	dev_dbg(&dev->dev, "ace_probe(%p)\n", dev);
 
 	/* device id and bus width */
-	of_property_read_u32(dev->dev.of_node, "port-number", &id);
-	if (id < 0)
+	if (of_property_read_u32(dev->dev.of_node, "port-number", &id))
 		id = 0;
 	if (of_find_property(dev->dev.of_node, "8-bit", NULL))
 		bus_width = ACE_BUS_WIDTH_8;

drivers/char/random.c

@@ -865,16 +865,24 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min,
 	if (r->entropy_count / 8 < min + reserved) {
 		nbytes = 0;
 	} else {
+		int entropy_count, orig;
+retry:
+		entropy_count = orig = ACCESS_ONCE(r->entropy_count);
 		/* If limited, never pull more than available */
-		if (r->limit && nbytes + reserved >= r->entropy_count / 8)
-			nbytes = r->entropy_count/8 - reserved;
-
-		if (r->entropy_count / 8 >= nbytes + reserved)
-			r->entropy_count -= nbytes*8;
-		else
-			r->entropy_count = reserved;
+		if (r->limit && nbytes + reserved >= entropy_count / 8)
+			nbytes = entropy_count/8 - reserved;
+
+		if (entropy_count / 8 >= nbytes + reserved) {
+			entropy_count -= nbytes*8;
+			if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
+				goto retry;
+		} else {
+			entropy_count = reserved;
+			if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
+				goto retry;
+		}
 
-		if (r->entropy_count < random_write_wakeup_thresh)
+		if (entropy_count < random_write_wakeup_thresh)
 			wakeup_write = 1;
 	}
 
@@ -957,10 +965,23 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf,
 {
 	ssize_t ret = 0, i;
 	__u8 tmp[EXTRACT_SIZE];
+	unsigned long flags;
 
 	/* if last_data isn't primed, we need EXTRACT_SIZE extra bytes */
-	if (fips_enabled && !r->last_data_init)
-		nbytes += EXTRACT_SIZE;
+	if (fips_enabled) {
+		spin_lock_irqsave(&r->lock, flags);
+		if (!r->last_data_init) {
+			r->last_data_init = true;
+			spin_unlock_irqrestore(&r->lock, flags);
+			trace_extract_entropy(r->name, EXTRACT_SIZE,
+					      r->entropy_count, _RET_IP_);
+			xfer_secondary_pool(r, EXTRACT_SIZE);
+			extract_buf(r, tmp);
+			spin_lock_irqsave(&r->lock, flags);
+			memcpy(r->last_data, tmp, EXTRACT_SIZE);
+		}
+		spin_unlock_irqrestore(&r->lock, flags);
+	}
 
 	trace_extract_entropy(r->name, nbytes, r->entropy_count, _RET_IP_);
 	xfer_secondary_pool(r, nbytes);
@@ -970,19 +991,6 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf,
 		extract_buf(r, tmp);
 
 		if (fips_enabled) {
-			unsigned long flags;
-
-
-			/* prime last_data value if need be, per fips 140-2 */
-			if (!r->last_data_init) {
-				spin_lock_irqsave(&r->lock, flags);
-				memcpy(r->last_data, tmp, EXTRACT_SIZE);
-				r->last_data_init = true;
-				nbytes -= EXTRACT_SIZE;
-				spin_unlock_irqrestore(&r->lock, flags);
-				extract_buf(r, tmp);
-			}
-
 			spin_lock_irqsave(&r->lock, flags);
 			if (!memcmp(tmp, r->last_data, EXTRACT_SIZE))
 				panic("Hardware RNG duplicated output!\n");

drivers/leds/leds-ot200.c

@@ -47,37 +47,37 @@ static struct ot200_led leds[] = {
 	{
 		.name = "led_1",
 		.port = 0x49,
-		.mask = BIT(7),
+		.mask = BIT(6),
 	},
 	{
 		.name = "led_2",
 		.port = 0x49,
-		.mask = BIT(6),
+		.mask = BIT(5),
 	},
 	{
 		.name = "led_3",
 		.port = 0x49,
-		.mask = BIT(5),
+		.mask = BIT(4),
 	},
 	{
 		.name = "led_4",
 		.port = 0x49,
-		.mask = BIT(4),
+		.mask = BIT(3),
 	},
 	{
 		.name = "led_5",
 		.port = 0x49,
-		.mask = BIT(3),
+		.mask = BIT(2),
 	},
 	{
 		.name = "led_6",
 		.port = 0x49,
-		.mask = BIT(2),
+		.mask = BIT(1),
 	},
 	{
 		.name = "led_7",
 		.port = 0x49,
-		.mask = BIT(1),
+		.mask = BIT(0),
 	}
 };
 

drivers/rapidio/Kconfig

@@ -47,4 +47,24 @@ config RAPIDIO_DEBUG
 
 	  If you are unsure about this, say N here.
 
+choice
+	prompt "Enumeration method"
+	depends on RAPIDIO
+	default RAPIDIO_ENUM_BASIC
+	help
+	  There are different enumeration and discovery mechanisms offered
+	  for RapidIO subsystem. You may select single built-in method or
+	  or any number of methods to be built as modules.
+	  Selecting a built-in method disables use of loadable methods.
+
+	  If unsure, select Basic built-in.
+
+config RAPIDIO_ENUM_BASIC
+	tristate "Basic"
+	help
+	  This option includes basic RapidIO fabric enumeration and discovery
+	  mechanism similar to one described in RapidIO specification Annex 1.
+
+endchoice
+
 source "drivers/rapidio/switches/Kconfig"

drivers/rapidio/Makefile

 #
 # Makefile for RapidIO interconnect services
 #
-obj-y += rio.o rio-access.o rio-driver.o rio-scan.o rio-sysfs.o
+obj-y += rio.o rio-access.o rio-driver.o rio-sysfs.o
+obj-$(CONFIG_RAPIDIO_ENUM_BASIC) += rio-scan.o
 
 obj-$(CONFIG_RAPIDIO)		+= switches/
 obj-$(CONFIG_RAPIDIO)		+= devices/

drivers/rapidio/devices/tsi721.c

@@ -471,6 +471,10 @@ static irqreturn_t tsi721_irqhandler(int irq, void *ptr)
 	u32 intval;
 	u32 ch_inte;
 
+	/* For MSI mode disable all device-level interrupts */
+	if (priv->flags & TSI721_USING_MSI)
+		iowrite32(0, priv->regs + TSI721_DEV_INTE);
+
 	dev_int = ioread32(priv->regs + TSI721_DEV_INT);
 	if (!dev_int)
 		return IRQ_NONE;
@@ -560,6 +564,14 @@ static irqreturn_t tsi721_irqhandler(int irq, void *ptr)
 		}
 	}
 #endif
+
+	/* For MSI mode re-enable device-level interrupts */
+	if (priv->flags & TSI721_USING_MSI) {
+		dev_int = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO |
+			TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH;
+		iowrite32(dev_int, priv->regs + TSI721_DEV_INTE);
+	}
+
 	return IRQ_HANDLED;
 }
 

drivers/rapidio/rio-driver.c

@@ -164,6 +164,13 @@ void rio_unregister_driver(struct rio_driver *rdrv)
 	driver_unregister(&rdrv->driver);
 }
 
+void rio_attach_device(struct rio_dev *rdev)
+{
+	rdev->dev.bus = &rio_bus_type;
+	rdev->dev.parent = &rio_bus;
+}
+EXPORT_SYMBOL_GPL(rio_attach_device);
+
 /**
  *  rio_match_bus - Tell if a RIO device structure has a matching RIO driver device id structure
  *  @dev: the standard device structure to match against
@@ -200,6 +207,7 @@ struct bus_type rio_bus_type = {
 	.name = "rapidio",
 	.match = rio_match_bus,
 	.dev_attrs = rio_dev_attrs,
+	.bus_attrs = rio_bus_attrs,
 	.probe = rio_device_probe,
 	.remove = rio_device_remove,
 };

drivers/rapidio/rio-scan.c

@@ -37,12 +37,8 @@
 
 #include "rio.h"
 
-LIST_HEAD(rio_devices);
-
 static void rio_init_em(struct rio_dev *rdev);
 
-DEFINE_SPINLOCK(rio_global_list_lock);
-
 static int next_destid = 0;
 static int next_comptag = 1;
 
@@ -326,127 +322,6 @@ static int rio_is_switch(struct rio_dev *rdev)
 	return 0;
 }
 
-/**
- * rio_switch_init - Sets switch operations for a particular vendor switch
- * @rdev: RIO device
- * @do_enum: Enumeration/Discovery mode flag
- *
- * Searches the RIO switch ops table for known switch types. If the vid
- * and did match a switch table entry, then call switch initialization
- * routine to setup switch-specific routines.
- */
-static void rio_switch_init(struct rio_dev *rdev, int do_enum)
-{
-	struct rio_switch_ops *cur = __start_rio_switch_ops;
-	struct rio_switch_ops *end = __end_rio_switch_ops;
-
-	while (cur < end) {
-		if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
-			pr_debug("RIO: calling init routine for %s\n",
-				 rio_name(rdev));
-			cur->init_hook(rdev, do_enum);
-			break;
-		}
-		cur++;
-	}
-
-	if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
-		pr_debug("RIO: adding STD routing ops for %s\n",
-			rio_name(rdev));
-		rdev->rswitch->add_entry = rio_std_route_add_entry;
-		rdev->rswitch->get_entry = rio_std_route_get_entry;
-		rdev->rswitch->clr_table = rio_std_route_clr_table;
-	}
-
-	if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
-		printk(KERN_ERR "RIO: missing routing ops for %s\n",
-		       rio_name(rdev));
-}
-
-/**
- * rio_add_device- Adds a RIO device to the device model
- * @rdev: RIO device
- *
- * Adds the RIO device to the global device list and adds the RIO
- * device to the RIO device list.  Creates the generic sysfs nodes
- * for an RIO device.
- */
-static int rio_add_device(struct rio_dev *rdev)
-{
-	int err;
-
-	err = device_add(&rdev->dev);
-	if (err)
-		return err;
-
-	spin_lock(&rio_global_list_lock);
-	list_add_tail(&rdev->global_list, &rio_devices);
-	spin_unlock(&rio_global_list_lock);
-
-	rio_create_sysfs_dev_files(rdev);
-
-	return 0;
-}
-
-/**
- * rio_enable_rx_tx_port - enable input receiver and output transmitter of
- * given port
- * @port: Master port associated with the RIO network
- * @local: local=1 select local port otherwise a far device is reached
- * @destid: Destination ID of the device to check host bit
- * @hopcount: Number of hops to reach the target
- * @port_num: Port (-number on switch) to enable on a far end device
- *
- * Returns 0 or 1 from on General Control Command and Status Register
- * (EXT_PTR+0x3C)
- */
-inline int rio_enable_rx_tx_port(struct rio_mport *port,
-				 int local, u16 destid,
-				 u8 hopcount, u8 port_num) {
-#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
-	u32 regval;
-	u32 ext_ftr_ptr;
-
-	/*
-	* enable rx input tx output port
-	*/
-	pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
-		 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
-
-	ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
-
-	if (local) {
-		rio_local_read_config_32(port, ext_ftr_ptr +
-				RIO_PORT_N_CTL_CSR(0),
-				&regval);
-	} else {
-		if (rio_mport_read_config_32(port, destid, hopcount,
-		ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
-			return -EIO;
-	}
-
-	if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
-		/* serial */
-		regval = regval | RIO_PORT_N_CTL_EN_RX_SER
-				| RIO_PORT_N_CTL_EN_TX_SER;
-	} else {
-		/* parallel */
-		regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
-				| RIO_PORT_N_CTL_EN_TX_PAR;
-	}
-
-	if (local) {
-		rio_local_write_config_32(port, ext_ftr_ptr +
-					  RIO_PORT_N_CTL_CSR(0), regval);
-	} else {
-		if (rio_mport_write_config_32(port, destid, hopcount,
-		    ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
-			return -EIO;
-	}
-#endif
-	return 0;
-}
-
 /**
  * rio_setup_device- Allocates and sets up a RIO device
  * @net: RIO network
@@ -587,8 +462,7 @@ static struct rio_dev *rio_setup_device(struct rio_net *net,
 			     rdev->destid);
 	}
 
-	rdev->dev.bus = &rio_bus_type;
-	rdev->dev.parent = &rio_bus;
+	rio_attach_device(rdev);
 
 	device_initialize(&rdev->dev);
 	rdev->dev.release = rio_release_dev;
@@ -1260,19 +1134,30 @@ static void rio_pw_enable(struct rio_mport *port, int enable)
 /**
  * rio_enum_mport- Start enumeration through a master port
  * @mport: Master port to send transactions
+ * @flags: Enumeration control flags
  *
  * Starts the enumeration process. If somebody has enumerated our
  * master port device, then give up. If not and we have an active
  * link, then start recursive peer enumeration. Returns %0 if
  * enumeration succeeds or %-EBUSY if enumeration fails.
  */
-int rio_enum_mport(struct rio_mport *mport)
+int rio_enum_mport(struct rio_mport *mport, u32 flags)
 {
 	struct rio_net *net = NULL;
 	int rc = 0;
 
 	printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
 	       mport->name);
+
+	/*
+	 * To avoid multiple start requests (repeat enumeration is not supported
+	 * by this method) check if enumeration/discovery was performed for this
+	 * mport: if mport was added into the list of mports for a net exit
+	 * with error.
+	 */
+	if (mport->nnode.next || mport->nnode.prev)
+		return -EBUSY;
+
 	/* If somebody else enumerated our master port device, bail. */
 	if (rio_enum_host(mport) < 0) {
 		printk(KERN_INFO
@@ -1362,14 +1247,16 @@ static void rio_build_route_tables(struct rio_net *net)
 /**
  * rio_disc_mport- Start discovery through a master port
  * @mport: Master port to send transactions
+ * @flags: discovery control flags
  *
  * Starts the discovery process. If we have an active link,
- * then wait for the signal that enumeration is complete.
+ * then wait for the signal that enumeration is complete (if wait
+ * is allowed).
  * When enumeration completion is signaled, start recursive
  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
  * on failure.
  */
-int rio_disc_mport(struct rio_mport *mport)
+int rio_disc_mport(struct rio_mport *mport, u32 flags)
 {
 	struct rio_net *net = NULL;
 	unsigned long to_end;
@@ -1379,6 +1266,11 @@ int rio_disc_mport(struct rio_mport *mport)
 
 	/* If master port has an active link, allocate net and discover peers */
 	if (rio_mport_is_active(mport)) {
+		if (rio_enum_complete(mport))
+			goto enum_done;
+		else if (flags & RIO_SCAN_ENUM_NO_WAIT)
+			return -EAGAIN;
+
 		pr_debug("RIO: wait for enumeration to complete...\n");
 
 		to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
@@ -1421,3 +1313,41 @@ int rio_disc_mport(struct rio_mport *mport)
 bail:
 	return -EBUSY;
 }
+
+static struct rio_scan rio_scan_ops = {
+	.enumerate = rio_enum_mport,
+	.discover = rio_disc_mport,
+};
+
+static bool scan;
+module_param(scan, bool, 0);
+MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
+			"(default = 0)");
+
+/**
+ * rio_basic_attach:
+ *
+ * When this enumeration/discovery method is loaded as a module this function
+ * registers its specific enumeration and discover routines for all available
+ * RapidIO mport devices. The "scan" command line parameter controls ability of
+ * the module to start RapidIO enumeration/discovery automatically.
+ *
+ * Returns 0 for success or -EIO if unable to register itself.
+ *
+ * This enumeration/discovery method cannot be unloaded and therefore does not
+ * provide a matching cleanup_module routine.
+ */
+
+static int __init rio_basic_attach(void)
+{
+	if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
+		return -EIO;
+	if (scan)
+		rio_init_mports();
+	return 0;
+}
+
+late_initcall(rio_basic_attach);
+
+MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
+MODULE_LICENSE("GPL");

drivers/rapidio/rio-sysfs.c

@@ -285,3 +285,48 @@ void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
 			rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_REMOVE);
 	}
 }
+
+static ssize_t bus_scan_store(struct bus_type *bus, const char *buf,
+				size_t count)
+{
+	long val;
+	struct rio_mport *port = NULL;
+	int rc;
+
+	if (kstrtol(buf, 0, &val) < 0)
+		return -EINVAL;
+
+	if (val == RIO_MPORT_ANY) {
+		rc = rio_init_mports();
+		goto exit;
+	}
+
+	if (val < 0 || val >= RIO_MAX_MPORTS)
+		return -EINVAL;
+
+	port = rio_find_mport((int)val);
+
+	if (!port) {
+		pr_debug("RIO: %s: mport_%d not available\n",
+			 __func__, (int)val);
+		return -EINVAL;
+	}
+
+	if (!port->nscan)
+		return -EINVAL;
+
+	if (port->host_deviceid >= 0)
+		rc = port->nscan->enumerate(port, 0);
+	else
+		rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
+exit:
+	if (!rc)
+		rc = count;
+
+	return rc;
+}
+
+struct bus_attribute rio_bus_attrs[] = {
+	__ATTR(scan, (S_IWUSR|S_IWGRP), NULL, bus_scan_store),
+	__ATTR_NULL
+};

drivers/rapidio/rio.c

@@ -31,7 +31,11 @@
 
 #include "rio.h"
 
+static LIST_HEAD(rio_devices);
+static DEFINE_SPINLOCK(rio_global_list_lock);
+
 static LIST_HEAD(rio_mports);
+static DEFINE_MUTEX(rio_mport_list_lock);
 static unsigned char next_portid;
 static DEFINE_SPINLOCK(rio_mmap_lock);
 
@@ -52,6 +56,32 @@ u16 rio_local_get_device_id(struct rio_mport *port)
 	return (RIO_GET_DID(port->sys_size, result));
 }
 
+/**
+ * rio_add_device- Adds a RIO device to the device model
+ * @rdev: RIO device
+ *
+ * Adds the RIO device to the global device list and adds the RIO
+ * device to the RIO device list.  Creates the generic sysfs nodes
+ * for an RIO device.
+ */
+int rio_add_device(struct rio_dev *rdev)
+{
+	int err;
+
+	err = device_add(&rdev->dev);
+	if (err)
+		return err;
+
+	spin_lock(&rio_global_list_lock);
+	list_add_tail(&rdev->global_list, &rio_devices);
+	spin_unlock(&rio_global_list_lock);
+
+	rio_create_sysfs_dev_files(rdev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rio_add_device);
+
 /**
  * rio_request_inb_mbox - request inbound mailbox service
  * @mport: RIO master port from which to allocate the mailbox resource
@@ -489,6 +519,7 @@ rio_mport_get_physefb(struct rio_mport *port, int local,
 
 	return ext_ftr_ptr;
 }
+EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
 
 /**
  * rio_get_comptag - Begin or continue searching for a RIO device by component tag
@@ -521,6 +552,7 @@ struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
 	spin_unlock(&rio_global_list_lock);
 	return rdev;
 }
+EXPORT_SYMBOL_GPL(rio_get_comptag);
 
 /**
  * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
@@ -545,6 +577,107 @@ int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
 				  regval);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(rio_set_port_lockout);
+
+/**
+ * rio_switch_init - Sets switch operations for a particular vendor switch
+ * @rdev: RIO device
+ * @do_enum: Enumeration/Discovery mode flag
+ *
+ * Searches the RIO switch ops table for known switch types. If the vid
+ * and did match a switch table entry, then call switch initialization
+ * routine to setup switch-specific routines.
+ */
+void rio_switch_init(struct rio_dev *rdev, int do_enum)
+{
+	struct rio_switch_ops *cur = __start_rio_switch_ops;
+	struct rio_switch_ops *end = __end_rio_switch_ops;
+
+	while (cur < end) {
+		if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
+			pr_debug("RIO: calling init routine for %s\n",
+				 rio_name(rdev));
+			cur->init_hook(rdev, do_enum);
+			break;
+		}
+		cur++;
+	}
+
+	if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
+		pr_debug("RIO: adding STD routing ops for %s\n",
+			rio_name(rdev));
+		rdev->rswitch->add_entry = rio_std_route_add_entry;
+		rdev->rswitch->get_entry = rio_std_route_get_entry;
+		rdev->rswitch->clr_table = rio_std_route_clr_table;
+	}
+
+	if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
+		printk(KERN_ERR "RIO: missing routing ops for %s\n",
+		       rio_name(rdev));
+}
+EXPORT_SYMBOL_GPL(rio_switch_init);
+
+/**
+ * rio_enable_rx_tx_port - enable input receiver and output transmitter of
+ * given port
+ * @port: Master port associated with the RIO network
+ * @local: local=1 select local port otherwise a far device is reached
+ * @destid: Destination ID of the device to check host bit
+ * @hopcount: Number of hops to reach the target
+ * @port_num: Port (-number on switch) to enable on a far end device
+ *
+ * Returns 0 or 1 from on General Control Command and Status Register
+ * (EXT_PTR+0x3C)
+ */
+int rio_enable_rx_tx_port(struct rio_mport *port,
+			  int local, u16 destid,
+			  u8 hopcount, u8 port_num)
+{
+#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
+	u32 regval;
+	u32 ext_ftr_ptr;
+
+	/*
+	* enable rx input tx output port
+	*/
+	pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
+		 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
+
+	ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
+
+	if (local) {
+		rio_local_read_config_32(port, ext_ftr_ptr +
+				RIO_PORT_N_CTL_CSR(0),
+				&regval);
+	} else {
+		if (rio_mport_read_config_32(port, destid, hopcount,
+		ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
+			return -EIO;
+	}
+
+	if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
+		/* serial */
+		regval = regval | RIO_PORT_N_CTL_EN_RX_SER
+				| RIO_PORT_N_CTL_EN_TX_SER;
+	} else {
+		/* parallel */
+		regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
+				| RIO_PORT_N_CTL_EN_TX_PAR;
+	}
+
+	if (local) {
+		rio_local_write_config_32(port, ext_ftr_ptr +
+					  RIO_PORT_N_CTL_CSR(0), regval);
+	} else {
+		if (rio_mport_write_config_32(port, destid, hopcount,
+		    ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
+			return -EIO;
+	}
+#endif
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
+
 
 /**
  * rio_chk_dev_route - Validate route to the specified device.
@@ -610,6 +743,7 @@ rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
 
 /**
  * rio_chk_dev_access - Validate access to the specified device.
@@ -941,6 +1075,7 @@ rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
 		return RIO_GET_BLOCK_ID(reg_val);
 	}
 }
+EXPORT_SYMBOL_GPL(rio_mport_get_efb);
 
 /**
  * rio_mport_get_feature - query for devices' extended features
@@ -997,6 +1132,7 @@ rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(rio_mport_get_feature);
 
 /**
  * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
@@ -1246,6 +1382,95 @@ EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
 
 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
 
+/**
+ * rio_find_mport - find RIO mport by its ID
+ * @mport_id: number (ID) of mport device
+ *
+ * Given a RIO mport number, the desired mport is located
+ * in the global list of mports. If the mport is found, a pointer to its
+ * data structure is returned.  If no mport is found, %NULL is returned.
+ */
+struct rio_mport *rio_find_mport(int mport_id)
+{
+	struct rio_mport *port;
+
+	mutex_lock(&rio_mport_list_lock);
+	list_for_each_entry(port, &rio_mports, node) {
+		if (port->id == mport_id)
+			goto found;
+	}
+	port = NULL;
+found:
+	mutex_unlock(&rio_mport_list_lock);
+
+	return port;
+}
+
+/**
+ * rio_register_scan - enumeration/discovery method registration interface
+ * @mport_id: mport device ID for which fabric scan routine has to be set
+ *            (RIO_MPORT_ANY = set for all available mports)
+ * @scan_ops: enumeration/discovery control structure
+ *
+ * Assigns enumeration or discovery method to the specified mport device (or all
+ * available mports if RIO_MPORT_ANY is specified).
+ * Returns error if the mport already has an enumerator attached to it.
+ * In case of RIO_MPORT_ANY ignores ports with valid scan routines and returns
+ * an error if was unable to find at least one available mport.
+ */
+int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
+{
+	struct rio_mport *port;
+	int rc = -EBUSY;
+
+	mutex_lock(&rio_mport_list_lock);
+	list_for_each_entry(port, &rio_mports, node) {
+		if (port->id == mport_id || mport_id == RIO_MPORT_ANY) {
+			if (port->nscan && mport_id == RIO_MPORT_ANY)
+				continue;
+			else if (port->nscan)
+				break;
+
+			port->nscan = scan_ops;
+			rc = 0;
+
+			if (mport_id != RIO_MPORT_ANY)
+				break;
+		}
+	}
+	mutex_unlock(&rio_mport_list_lock);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(rio_register_scan);
+
+/**
+ * rio_unregister_scan - removes enumeration/discovery method from mport
+ * @mport_id: mport device ID for which fabric scan routine has to be
+ *            unregistered (RIO_MPORT_ANY = set for all available mports)
+ *
+ * Removes enumeration or discovery method assigned to the specified mport
+ * device (or all available mports if RIO_MPORT_ANY is specified).
+ */
+int rio_unregister_scan(int mport_id)
+{
+	struct rio_mport *port;
+
+	mutex_lock(&rio_mport_list_lock);
+	list_for_each_entry(port, &rio_mports, node) {
+		if (port->id == mport_id || mport_id == RIO_MPORT_ANY) {
+			if (port->nscan)
+				port->nscan = NULL;
+			if (mport_id != RIO_MPORT_ANY)
+				break;
+		}
+	}
+	mutex_unlock(&rio_mport_list_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rio_unregister_scan);
+
 static void rio_fixup_device(struct rio_dev *dev)
 {
 }
@@ -1274,7 +1499,7 @@ static void disc_work_handler(struct work_struct *_work)
 	work = container_of(_work, struct rio_disc_work, work);
 	pr_debug("RIO: discovery work for mport %d %s\n",
 		 work->mport->id, work->mport->name);
-	rio_disc_mport(work->mport);
+	work->mport->nscan->discover(work->mport, 0);
 }
 
 int rio_init_mports(void)
@@ -1290,12 +1515,15 @@ int rio_init_mports(void)
 	 * First, run enumerations and check if we need to perform discovery
 	 * on any of the registered mports.
 	 */
+	mutex_lock(&rio_mport_list_lock);
 	list_for_each_entry(port, &rio_mports, node) {
-		if (port->host_deviceid >= 0)
-			rio_enum_mport(port);
-		else
+		if (port->host_deviceid >= 0) {
+			if (port->nscan)
+				port->nscan->enumerate(port, 0);
+		} else
 			n++;
 	}
+	mutex_unlock(&rio_mport_list_lock);
 
 	if (!n)
 		goto no_disc;
@@ -1322,14 +1550,16 @@ int rio_init_mports(void)
 	}
 
 	n = 0;
+	mutex_lock(&rio_mport_list_lock);
 	list_for_each_entry(port, &rio_mports, node) {
-		if (port->host_deviceid < 0) {
+		if (port->host_deviceid < 0 && port->nscan) {
 			work[n].mport = port;
 			INIT_WORK(&work[n].work, disc_work_handler);
 			queue_work(rio_wq, &work[n].work);
 			n++;
 		}
 	}
+	mutex_unlock(&rio_mport_list_lock);
 
 	flush_workqueue(rio_wq);
 	pr_debug("RIO: destroy discovery workqueue\n");
@@ -1342,8 +1572,6 @@ int rio_init_mports(void)
 	return 0;
 }
 
-device_initcall_sync(rio_init_mports);
-
 static int hdids[RIO_MAX_MPORTS + 1];
 
 static int rio_get_hdid(int index)
@@ -1371,7 +1599,10 @@ int rio_register_mport(struct rio_mport *port)
 
 	port->id = next_portid++;
 	port->host_deviceid = rio_get_hdid(port->id);
+	port->nscan = NULL;
+	mutex_lock(&rio_mport_list_lock);
 	list_add_tail(&port->node, &rio_mports);
+	mutex_unlock(&rio_mport_list_lock);
 	return 0;
 }
 
@@ -1386,3 +1617,4 @@ EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
+EXPORT_SYMBOL_GPL(rio_init_mports);

drivers/rapidio/rio.h

@@ -15,6 +15,7 @@
 #include <linux/rio.h>
 
 #define RIO_MAX_CHK_RETRY	3
+#define RIO_MPORT_ANY		(-1)
 
 /* Functions internal to the RIO core code */
 
@@ -27,8 +28,6 @@ extern u32 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
 extern int rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid,
 				    u8 hopcount);
 extern int rio_create_sysfs_dev_files(struct rio_dev *rdev);
-extern int rio_enum_mport(struct rio_mport *mport);
-extern int rio_disc_mport(struct rio_mport *mport);
 extern int rio_std_route_add_entry(struct rio_mport *mport, u16 destid,
 				   u8 hopcount, u16 table, u16 route_destid,
 				   u8 route_port);
@@ -39,10 +38,18 @@ extern int rio_std_route_clr_table(struct rio_mport *mport, u16 destid,
 				   u8 hopcount, u16 table);
 extern int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock);
 extern struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from);
+extern int rio_add_device(struct rio_dev *rdev);
+extern void rio_switch_init(struct rio_dev *rdev, int do_enum);
+extern int rio_enable_rx_tx_port(struct rio_mport *port, int local, u16 destid,
+				 u8 hopcount, u8 port_num);
+extern int rio_register_scan(int mport_id, struct rio_scan *scan_ops);
+extern int rio_unregister_scan(int mport_id);
+extern void rio_attach_device(struct rio_dev *rdev);
+extern struct rio_mport *rio_find_mport(int mport_id);
 
 /* Structures internal to the RIO core code */
 extern struct device_attribute rio_dev_attrs[];
-extern spinlock_t rio_global_list_lock;
+extern struct bus_attribute rio_bus_attrs[];
 
 extern struct rio_switch_ops __start_rio_switch_ops[];
 extern struct rio_switch_ops __end_rio_switch_ops[];

drivers/rtc/rtc-max8998.c

@@ -285,7 +285,7 @@ static int max8998_rtc_probe(struct platform_device *pdev)
 			info->irq, ret);
 
 	dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name);
-	if (pdata->rtc_delay) {
+	if (pdata && pdata->rtc_delay) {
 		info->lp3974_bug_workaround = true;
 		dev_warn(&pdev->dev, "LP3974 with RTC REGERR option."
 				" RTC updates will be extremely slow.\n");

drivers/rtc/rtc-pl031.c

@@ -306,7 +306,7 @@ static int pl031_remove(struct amba_device *adev)
 	struct pl031_local *ldata = dev_get_drvdata(&adev->dev);
 
 	amba_set_drvdata(adev, NULL);
-	free_irq(adev->irq[0], ldata->rtc);
+	free_irq(adev->irq[0], ldata);
 	rtc_device_unregister(ldata->rtc);
 	iounmap(ldata->base);
 	kfree(ldata);

drivers/video/Kconfig

@@ -2199,7 +2199,7 @@ config FB_XILINX
 
 config FB_GOLDFISH
 	tristate "Goldfish Framebuffer"
-	depends on FB
+	depends on FB && HAS_DMA
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
@@ -2453,6 +2453,23 @@ config FB_HYPERV
 	help
 	  This framebuffer driver supports Microsoft Hyper-V Synthetic Video.
 
+config FB_SIMPLE
+	bool "Simple framebuffer support"
+	depends on (FB = y) && OF
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	help
+	  Say Y if you want support for a simple frame-buffer.
+
+	  This driver assumes that the display hardware has been initialized
+	  before the kernel boots, and the kernel will simply render to the
+	  pre-allocated frame buffer surface.
+
+	  Configuration re: surface address, size, and format must be provided
+	  through device tree, or potentially plain old platform data in the
+	  future.
+
 source "drivers/video/omap/Kconfig"
 source "drivers/video/omap2/Kconfig"
 source "drivers/video/exynos/Kconfig"

drivers/video/Makefile

@@ -166,6 +166,7 @@ obj-$(CONFIG_FB_MX3)		  += mx3fb.o
 obj-$(CONFIG_FB_DA8XX)		  += da8xx-fb.o
 obj-$(CONFIG_FB_MXS)		  += mxsfb.o
 obj-$(CONFIG_FB_SSD1307)	  += ssd1307fb.o
+obj-$(CONFIG_FB_SIMPLE)           += simplefb.o
 
 # the test framebuffer is last
 obj-$(CONFIG_FB_VIRTUAL)          += vfb.o

drivers/video/simplefb.c

+/*
+ * Simplest possible simple frame-buffer driver, as a platform device
+ *
+ * Copyright (c) 2013, Stephen Warren
+ *
+ * Based on q40fb.c, which was:
+ * Copyright (C) 2001 Richard Zidlicky <rz@linux-m68k.org>
+ *
+ * Also based on offb.c, which was:
+ * Copyright (C) 1997 Geert Uytterhoeven
+ * Copyright (C) 1996 Paul Mackerras
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+static struct fb_fix_screeninfo simplefb_fix = {
+	.id		= "simple",
+	.type		= FB_TYPE_PACKED_PIXELS,
+	.visual		= FB_VISUAL_TRUECOLOR,
+	.accel		= FB_ACCEL_NONE,
+};
+
+static struct fb_var_screeninfo simplefb_var = {
+	.height		= -1,
+	.width		= -1,
+	.activate	= FB_ACTIVATE_NOW,
+	.vmode		= FB_VMODE_NONINTERLACED,
+};
+
+static int simplefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			      u_int transp, struct fb_info *info)
+{
+	u32 *pal = info->pseudo_palette;
+	u32 cr = red >> (16 - info->var.red.length);
+	u32 cg = green >> (16 - info->var.green.length);
+	u32 cb = blue >> (16 - info->var.blue.length);
+	u32 value;
+
+	if (regno >= 16)
+		return -EINVAL;
+
+	value = (cr << info->var.red.offset) |
+		(cg << info->var.green.offset) |
+		(cb << info->var.blue.offset);
+	if (info->var.transp.length > 0) {
+		u32 mask = (1 << info->var.transp.length) - 1;
+		mask <<= info->var.transp.offset;
+		value |= mask;
+	}
+	pal[regno] = value;
+
+	return 0;
+}
+
+static struct fb_ops simplefb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_setcolreg	= simplefb_setcolreg,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+};
+
+struct simplefb_format {
+	const char *name;
+	u32 bits_per_pixel;
+	struct fb_bitfield red;
+	struct fb_bitfield green;
+	struct fb_bitfield blue;
+	struct fb_bitfield transp;
+};
+
+static struct simplefb_format simplefb_formats[] = {
+	{ "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0} },
+};
+
+struct simplefb_params {
+	u32 width;
+	u32 height;
+	u32 stride;
+	struct simplefb_format *format;
+};
+
+static int simplefb_parse_dt(struct platform_device *pdev,
+			   struct simplefb_params *params)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+	const char *format;
+	int i;
+
+	ret = of_property_read_u32(np, "width", &params->width);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't parse width property\n");
+		return ret;
+	}
+
+	ret = of_property_read_u32(np, "height", &params->height);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't parse height property\n");
+		return ret;
+	}
+
+	ret = of_property_read_u32(np, "stride", &params->stride);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't parse stride property\n");
+		return ret;
+	}
+
+	ret = of_property_read_string(np, "format", &format);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't parse format property\n");
+		return ret;
+	}
+	params->format = NULL;
+	for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) {
+		if (strcmp(format, simplefb_formats[i].name))
+			continue;
+		params->format = &simplefb_formats[i];
+		break;
+	}
+	if (!params->format) {
+		dev_err(&pdev->dev, "Invalid format value\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int simplefb_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct simplefb_params params;
+	struct fb_info *info;
+	struct resource *mem;
+
+	if (fb_get_options("simplefb", NULL))
+		return -ENODEV;
+
+	ret = simplefb_parse_dt(pdev, &params);
+	if (ret)
+		return ret;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "No memory resource\n");
+		return -EINVAL;
+	}
+
+	info = framebuffer_alloc(sizeof(u32) * 16, &pdev->dev);
+	if (!info)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, info);
+
+	info->fix = simplefb_fix;
+	info->fix.smem_start = mem->start;
+	info->fix.smem_len = resource_size(mem);
+	info->fix.line_length = params.stride;
+
+	info->var = simplefb_var;
+	info->var.xres = params.width;
+	info->var.yres = params.height;
+	info->var.xres_virtual = params.width;
+	info->var.yres_virtual = params.height;
+	info->var.bits_per_pixel = params.format->bits_per_pixel;
+	info->var.red = params.format->red;
+	info->var.green = params.format->green;
+	info->var.blue = params.format->blue;
+	info->var.transp = params.format->transp;
+
+	info->fbops = &simplefb_ops;
+	info->flags = FBINFO_DEFAULT;
+	info->screen_base = devm_ioremap(&pdev->dev, info->fix.smem_start,
+					 info->fix.smem_len);
+	if (!info->screen_base) {
+		framebuffer_release(info);
+		return -ENODEV;
+	}
+	info->pseudo_palette = (void *)(info + 1);
+
+	ret = register_framebuffer(info);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret);
+		framebuffer_release(info);
+		return ret;
+	}
+
+	dev_info(&pdev->dev, "fb%d: simplefb registered!\n", info->node);
+
+	return 0;
+}
+
+static int simplefb_remove(struct platform_device *pdev)
+{
+	struct fb_info *info = platform_get_drvdata(pdev);
+
+	unregister_framebuffer(info);
+	framebuffer_release(info);
+
+	return 0;
+}
+
+static const struct of_device_id simplefb_of_match[] = {
+	{ .compatible = "simple-framebuffer", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, simplefb_of_match);
+
+static struct platform_driver simplefb_driver = {
+	.driver = {
+		.name = "simple-framebuffer",
+		.owner = THIS_MODULE,
+		.of_match_table = simplefb_of_match,
+	},
+	.probe = simplefb_probe,
+	.remove = simplefb_remove,
+};
+module_platform_driver(simplefb_driver);
+
+MODULE_AUTHOR("Stephen Warren <swarren@wwwdotorg.org>");
+MODULE_DESCRIPTION("Simple framebuffer driver");
+MODULE_LICENSE("GPL v2");

fs/aio.c

@@ -307,7 +307,9 @@ static void free_ioctx(struct kioctx *ctx)
 	kunmap_atomic(ring);
 
 	while (atomic_read(&ctx->reqs_active) > 0) {
-		wait_event(ctx->wait, head != ctx->tail);
+		wait_event(ctx->wait,
+				head != ctx->tail ||
+				atomic_read(&ctx->reqs_active) <= 0);
 
 		avail = (head <= ctx->tail ? ctx->tail : ctx->nr_events) - head;
 
@@ -1299,8 +1301,7 @@ SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,
  *	< min_nr if the timeout specified by timeout has elapsed
  *	before sufficient events are available, where timeout == NULL
  *	specifies an infinite timeout. Note that the timeout pointed to by
- *	timeout is relative and will be updated if not NULL and the
- *	operation blocks. Will fail with -ENOSYS if not implemented.
+ *	timeout is relative.  Will fail with -ENOSYS if not implemented.
  */
 SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
 		long, min_nr,

fs/fat/inode.c

@@ -1229,6 +1229,19 @@ static int fat_read_root(struct inode *inode)
 	return 0;
 }
 
+static unsigned long calc_fat_clusters(struct super_block *sb)
+{
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+	/* Divide first to avoid overflow */
+	if (sbi->fat_bits != 12) {
+		unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits;
+		return ent_per_sec * sbi->fat_length;
+	}
+
+	return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
+}
+
 /*
  * Read the super block of an MS-DOS FS.
  */
@@ -1434,7 +1447,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 		sbi->dirty = b->fat16.state & FAT_STATE_DIRTY;
 
 	/* check that FAT table does not overflow */
-	fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
+	fat_clusters = calc_fat_clusters(sb);
 	total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT);
 	if (total_clusters > MAX_FAT(sb)) {
 		if (!silent)

fs/hfs/bnode.c

@@ -415,7 +415,11 @@ struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num)
 	spin_lock(&tree->hash_lock);
 	node = hfs_bnode_findhash(tree, num);
 	spin_unlock(&tree->hash_lock);
-	BUG_ON(node);
+	if (node) {
+		pr_crit("new node %u already hashed?\n", num);
+		WARN_ON(1);
+		return node;
+	}
 	node = __hfs_bnode_create(tree, num);
 	if (!node)
 		return ERR_PTR(-ENOMEM);

fs/nilfs2/inode.c

@@ -219,13 +219,32 @@ static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
 
 static int nilfs_set_page_dirty(struct page *page)
 {
-	int ret = __set_page_dirty_buffers(page);
+	int ret = __set_page_dirty_nobuffers(page);
 
-	if (ret) {
+	if (page_has_buffers(page)) {
 		struct inode *inode = page->mapping->host;
-		unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
+		unsigned nr_dirty = 0;
+		struct buffer_head *bh, *head;
 
-		nilfs_set_file_dirty(inode, nr_dirty);
+		/*
+		 * This page is locked by callers, and no other thread
+		 * concurrently marks its buffers dirty since they are
+		 * only dirtied through routines in fs/buffer.c in
+		 * which call sites of mark_buffer_dirty are protected
+		 * by page lock.
+		 */
+		bh = head = page_buffers(page);
+		do {
+			/* Do not mark hole blocks dirty */
+			if (buffer_dirty(bh) || !buffer_mapped(bh))
+				continue;
+
+			set_buffer_dirty(bh);
+			nr_dirty++;
+		} while (bh = bh->b_this_page, bh != head);
+
+		if (nr_dirty)
+			nilfs_set_file_dirty(inode, nr_dirty);
 	}
 	return ret;
 }

fs/ocfs2/extent_map.c

@@ -790,7 +790,7 @@ int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 						 &hole_size, &rec, &is_last);
 		if (ret) {
 			mlog_errno(ret);
-			goto out;
+			goto out_unlock;
 		}
 
 		if (rec.e_blkno == 0ULL) {

fs/ocfs2/file.c

@@ -2288,7 +2288,7 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
 		ret = ocfs2_inode_lock(inode, NULL, 1);
 		if (ret < 0) {
 			mlog_errno(ret);
-			goto out_sems;
+			goto out;
 		}
 
 		ocfs2_inode_unlock(inode, 1);

include/linux/kernel.h

@@ -562,6 +562,9 @@ int __trace_bprintk(unsigned long ip, const char *fmt, ...);
 extern __printf(2, 3)
 int __trace_printk(unsigned long ip, const char *fmt, ...);
 
+extern int __trace_bputs(unsigned long ip, const char *str);
+extern int __trace_puts(unsigned long ip, const char *str, int size);
+
 /**
  * trace_puts - write a string into the ftrace buffer
  * @str: the string to record
@@ -587,8 +590,6 @@ int __trace_printk(unsigned long ip, const char *fmt, ...);
  *  (1 when __trace_bputs is used, strlen(str) when __trace_puts is used)
  */
 
-extern int __trace_bputs(unsigned long ip, const char *str);
-extern int __trace_puts(unsigned long ip, const char *str, int size);
 #define trace_puts(str) ({						\
 	static const char *trace_printk_fmt				\
 		__attribute__((section("__trace_printk_fmt"))) =	\

include/linux/rio.h

@@ -83,7 +83,6 @@
 
 extern struct bus_type rio_bus_type;
 extern struct device rio_bus;
-extern struct list_head rio_devices;	/* list of all devices */
 
 struct rio_mport;
 struct rio_dev;
@@ -237,6 +236,7 @@ enum rio_phy_type {
  * @name: Port name string
  * @priv: Master port private data
  * @dma: DMA device associated with mport
+ * @nscan: RapidIO network enumeration/discovery operations
  */
 struct rio_mport {
 	struct list_head dbells;	/* list of doorbell events */
@@ -262,8 +262,14 @@ struct rio_mport {
 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 	struct dma_device	dma;
 #endif
+	struct rio_scan *nscan;
 };
 
+/*
+ * Enumeration/discovery control flags
+ */
+#define RIO_SCAN_ENUM_NO_WAIT	0x00000001 /* Do not wait for enum completed */
+
 struct rio_id_table {
 	u16 start;	/* logical minimal id */
 	u32 max;	/* max number of IDs in table */
@@ -460,6 +466,16 @@ static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
 }
 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
 
+/**
+ * struct rio_scan - RIO enumeration and discovery operations
+ * @enumerate: Callback to perform RapidIO fabric enumeration.
+ * @discover: Callback to perform RapidIO fabric discovery.
+ */
+struct rio_scan {
+	int (*enumerate)(struct rio_mport *mport, u32 flags);
+	int (*discover)(struct rio_mport *mport, u32 flags);
+};
+
 /* Architecture and hardware-specific functions */
 extern int rio_register_mport(struct rio_mport *);
 extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);

include/linux/rio_drv.h

@@ -433,5 +433,6 @@ extern u16 rio_local_get_device_id(struct rio_mport *port);
 extern struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from);
 extern struct rio_dev *rio_get_asm(u16 vid, u16 did, u16 asm_vid, u16 asm_did,
 				   struct rio_dev *from);
+extern int rio_init_mports(void);
 
 #endif				/* LINUX_RIO_DRV_H */

include/linux/wait.h

@@ -217,6 +217,8 @@ do {									\
 		if (!ret)						\
 			break;						\
 	}								\
+	if (!ret && (condition))					\
+		ret = 1;						\
 	finish_wait(&wq, &__wait);					\
 } while (0)
 
@@ -233,8 +235,9 @@ do {									\
  * wake_up() has to be called after changing any variable that could
  * change the result of the wait condition.
  *
- * The function returns 0 if the @timeout elapsed, and the remaining
- * jiffies if the condition evaluated to true before the timeout elapsed.
+ * The function returns 0 if the @timeout elapsed, or the remaining
+ * jiffies (at least 1) if the @condition evaluated to %true before
+ * the @timeout elapsed.
  */
 #define wait_event_timeout(wq, condition, timeout)			\
 ({									\
@@ -302,6 +305,8 @@ do {									\
 		ret = -ERESTARTSYS;					\
 		break;							\
 	}								\
+	if (!ret && (condition))					\
+		ret = 1;						\
 	finish_wait(&wq, &__wait);					\
 } while (0)
 
@@ -318,9 +323,10 @@ do {									\
  * wake_up() has to be called after changing any variable that could
  * change the result of the wait condition.
  *
- * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
- * was interrupted by a signal, and the remaining jiffies otherwise
- * if the condition evaluated to true before the timeout elapsed.
+ * Returns:
+ * 0 if the @timeout elapsed, -%ERESTARTSYS if it was interrupted by
+ * a signal, or the remaining jiffies (at least 1) if the @condition
+ * evaluated to %true before the @timeout elapsed.
  */
 #define wait_event_interruptible_timeout(wq, condition, timeout)	\
 ({									\

kernel/auditfilter.c

@@ -1021,9 +1021,6 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
  * @seq: netlink audit message sequence (serial) number
  * @data: payload data
  * @datasz: size of payload data
- * @loginuid: loginuid of sender
- * @sessionid: sessionid for netlink audit message
- * @sid: SE Linux Security ID of sender
  */
 int audit_receive_filter(int type, int pid, int seq, void *data, size_t datasz)
 {

mm/huge_memory.c

@@ -2325,7 +2325,12 @@ static void collapse_huge_page(struct mm_struct *mm,
 		pte_unmap(pte);
 		spin_lock(&mm->page_table_lock);
 		BUG_ON(!pmd_none(*pmd));
-		set_pmd_at(mm, address, pmd, _pmd);
+		/*
+		 * We can only use set_pmd_at when establishing
+		 * hugepmds and never for establishing regular pmds that
+		 * points to regular pagetables. Use pmd_populate for that
+		 */
+		pmd_populate(mm, pmd, pmd_pgtable(_pmd));
 		spin_unlock(&mm->page_table_lock);
 		anon_vma_unlock_write(vma->anon_vma);
 		goto out;

mm/memcontrol.c

@@ -4108,8 +4108,6 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype,
 	if (mem_cgroup_disabled())
 		return NULL;
 
-	VM_BUG_ON(PageSwapCache(page));
-
 	if (PageTransHuge(page)) {
 		nr_pages <<= compound_order(page);
 		VM_BUG_ON(!PageTransHuge(page));
@@ -4205,6 +4203,18 @@ void mem_cgroup_uncharge_page(struct page *page)
 	if (page_mapped(page))
 		return;
 	VM_BUG_ON(page->mapping && !PageAnon(page));
+	/*
+	 * If the page is in swap cache, uncharge should be deferred
+	 * to the swap path, which also properly accounts swap usage
+	 * and handles memcg lifetime.
+	 *
+	 * Note that this check is not stable and reclaim may add the
+	 * page to swap cache at any time after this.  However, if the
+	 * page is not in swap cache by the time page->mapcount hits
+	 * 0, there won't be any page table references to the swap
+	 * slot, and reclaim will free it and not actually write the
+	 * page to disk.
+	 */
 	if (PageSwapCache(page))
 		return;
 	__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_ANON, false);

mm/memory_hotplug.c

@@ -720,9 +720,12 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
 	start = phys_start_pfn << PAGE_SHIFT;
 	size = nr_pages * PAGE_SIZE;
 	ret = release_mem_region_adjustable(&iomem_resource, start, size);
-	if (ret)
-		pr_warn("Unable to release resource <%016llx-%016llx> (%d)\n",
-				start, start + size - 1, ret);
+	if (ret) {
+		resource_size_t endres = start + size - 1;
+
+		pr_warn("Unable to release resource <%pa-%pa> (%d)\n",
+				&start, &endres, ret);
+	}
 
 	sections_to_remove = nr_pages / PAGES_PER_SECTION;
 	for (i = 0; i < sections_to_remove; i++) {

mm/migrate.c

@@ -165,7 +165,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
 		pte = arch_make_huge_pte(pte, vma, new, 0);
 	}
 #endif
-	flush_cache_page(vma, addr, pte_pfn(pte));
+	flush_dcache_page(new);
 	set_pte_at(mm, addr, ptep, pte);
 
 	if (PageHuge(new)) {

mm/mmu_notifier.c

@@ -40,48 +40,44 @@ void __mmu_notifier_release(struct mm_struct *mm)
 	int id;
 
 	/*
-	 * srcu_read_lock() here will block synchronize_srcu() in
-	 * mmu_notifier_unregister() until all registered
-	 * ->release() callouts this function makes have
-	 * returned.
+	 * SRCU here will block mmu_notifier_unregister until
+	 * ->release returns.
 	 */
 	id = srcu_read_lock(&srcu);
+	hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist)
+		/*
+		 * If ->release runs before mmu_notifier_unregister it must be
+		 * handled, as it's the only way for the driver to flush all
+		 * existing sptes and stop the driver from establishing any more
+		 * sptes before all the pages in the mm are freed.
+		 */
+		if (mn->ops->release)
+			mn->ops->release(mn, mm);
+	srcu_read_unlock(&srcu, id);
+
 	spin_lock(&mm->mmu_notifier_mm->lock);
 	while (unlikely(!hlist_empty(&mm->mmu_notifier_mm->list))) {
 		mn = hlist_entry(mm->mmu_notifier_mm->list.first,
 				 struct mmu_notifier,
 				 hlist);
-
 		/*
-		 * Unlink.  This will prevent mmu_notifier_unregister()
-		 * from also making the ->release() callout.
+		 * We arrived before mmu_notifier_unregister so
+		 * mmu_notifier_unregister will do nothing other than to wait
+		 * for ->release to finish and for mmu_notifier_unregister to
+		 * return.
 		 */
 		hlist_del_init_rcu(&mn->hlist);
-		spin_unlock(&mm->mmu_notifier_mm->lock);
-
-		/*
-		 * Clear sptes. (see 'release' description in mmu_notifier.h)
-		 */
-		if (mn->ops->release)
-			mn->ops->release(mn, mm);
-
-		spin_lock(&mm->mmu_notifier_mm->lock);
 	}
 	spin_unlock(&mm->mmu_notifier_mm->lock);
 
 	/*
-	 * All callouts to ->release() which we have done are complete.
-	 * Allow synchronize_srcu() in mmu_notifier_unregister() to complete
-	 */
-	srcu_read_unlock(&srcu, id);
-
-	/*
-	 * mmu_notifier_unregister() may have unlinked a notifier and may
-	 * still be calling out to it.	Additionally, other notifiers
-	 * may have been active via vmtruncate() et. al. Block here
-	 * to ensure that all notifier callouts for this mm have been
-	 * completed and the sptes are really cleaned up before returning
-	 * to exit_mmap().
+	 * synchronize_srcu here prevents mmu_notifier_release from returning to
+	 * exit_mmap (which would proceed with freeing all pages in the mm)
+	 * until the ->release method returns, if it was invoked by
+	 * mmu_notifier_unregister.
+	 *
+	 * The mmu_notifier_mm can't go away from under us because one mm_count
+	 * is held by exit_mmap.
 	 */
 	synchronize_srcu(&srcu);
 }
@@ -292,31 +288,34 @@ void mmu_notifier_unregister(struct mmu_notifier *mn, struct mm_struct *mm)
 {
 	BUG_ON(atomic_read(&mm->mm_count) <= 0);
 
-	spin_lock(&mm->mmu_notifier_mm->lock);
 	if (!hlist_unhashed(&mn->hlist)) {
+		/*
+		 * SRCU here will force exit_mmap to wait for ->release to
+		 * finish before freeing the pages.
+		 */
 		int id;
 
+		id = srcu_read_lock(&srcu);
 		/*
-		 * Ensure we synchronize up with __mmu_notifier_release().
+		 * exit_mmap will block in mmu_notifier_release to guarantee
+		 * that ->release is called before freeing the pages.
 		 */
-		id = srcu_read_lock(&srcu);
-
-		hlist_del_rcu(&mn->hlist);
-		spin_unlock(&mm->mmu_notifier_mm->lock);
-
 		if (mn->ops->release)
 			mn->ops->release(mn, mm);
+		srcu_read_unlock(&srcu, id);
 
+		spin_lock(&mm->mmu_notifier_mm->lock);
 		/*
-		 * Allow __mmu_notifier_release() to complete.
+		 * Can not use list_del_rcu() since __mmu_notifier_release
+		 * can delete it before we hold the lock.
 		 */
-		srcu_read_unlock(&srcu, id);
-	} else
+		hlist_del_init_rcu(&mn->hlist);
 		spin_unlock(&mm->mmu_notifier_mm->lock);
+	}
 
 	/*
-	 * Wait for any running method to finish, including ->release() if it
-	 * was run by __mmu_notifier_release() instead of us.
+	 * Wait for any running method to finish, of course including
+	 * ->release if it was run by mmu_notifier_relase instead of us.
 	 */
 	synchronize_srcu(&srcu);
 

mm/pagewalk.c

@@ -127,28 +127,7 @@ static int walk_hugetlb_range(struct vm_area_struct *vma,
 	return 0;
 }
 
-static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk)
-{
-	struct vm_area_struct *vma;
-
-	/* We don't need vma lookup at all. */
-	if (!walk->hugetlb_entry)
-		return NULL;
-
-	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
-	vma = find_vma(walk->mm, addr);
-	if (vma && vma->vm_start <= addr && is_vm_hugetlb_page(vma))
-		return vma;
-
-	return NULL;
-}
-
 #else /* CONFIG_HUGETLB_PAGE */
-static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk)
-{
-	return NULL;
-}
-
 static int walk_hugetlb_range(struct vm_area_struct *vma,
 			      unsigned long addr, unsigned long end,
 			      struct mm_walk *walk)
@@ -198,30 +177,53 @@ int walk_page_range(unsigned long addr, unsigned long end,
 	if (!walk->mm)
 		return -EINVAL;
 
+	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
+
 	pgd = pgd_offset(walk->mm, addr);
 	do {
-		struct vm_area_struct *vma;
+		struct vm_area_struct *vma = NULL;
 
 		next = pgd_addr_end(addr, end);
 
 		/*
-		 * handle hugetlb vma individually because pagetable walk for
-		 * the hugetlb page is dependent on the architecture and
-		 * we can't handled it in the same manner as non-huge pages.
+		 * This function was not intended to be vma based.
+		 * But there are vma special cases to be handled:
+		 * - hugetlb vma's
+		 * - VM_PFNMAP vma's
 		 */
-		vma = hugetlb_vma(addr, walk);
+		vma = find_vma(walk->mm, addr);
 		if (vma) {
-			if (vma->vm_end < next)
+			/*
+			 * There are no page structures backing a VM_PFNMAP
+			 * range, so do not allow split_huge_page_pmd().
+			 */
+			if ((vma->vm_start <= addr) &&
+			    (vma->vm_flags & VM_PFNMAP)) {
 				next = vma->vm_end;
+				pgd = pgd_offset(walk->mm, next);
+				continue;
+			}
 			/*
-			 * Hugepage is very tightly coupled with vma, so
-			 * walk through hugetlb entries within a given vma.
+			 * Handle hugetlb vma individually because pagetable
+			 * walk for the hugetlb page is dependent on the
+			 * architecture and we can't handled it in the same
+			 * manner as non-huge pages.
 			 */
-			err = walk_hugetlb_range(vma, addr, next, walk);
-			if (err)
-				break;
-			pgd = pgd_offset(walk->mm, next);
-			continue;
+			if (walk->hugetlb_entry && (vma->vm_start <= addr) &&
+			    is_vm_hugetlb_page(vma)) {
+				if (vma->vm_end < next)
+					next = vma->vm_end;
+				/*
+				 * Hugepage is very tightly coupled with vma,
+				 * so walk through hugetlb entries within a
+				 * given vma.
+				 */
+				err = walk_hugetlb_range(vma, addr, next, walk);
+				if (err)
+					break;
+				pgd = pgd_offset(walk->mm, next);
+				continue;
+			}
 		}
 
 		if (pgd_none_or_clear_bad(pgd)) {

tools/testing/selftests/Makefile

@@ -6,7 +6,6 @@ TARGETS += memory-hotplug
 TARGETS += mqueue
 TARGETS += net
 TARGETS += ptrace
-TARGETS += soft-dirty
 TARGETS += vm
 
 all:

tools/testing/selftests/soft-dirty/Makefile

-CFLAGS += -iquote../../../../include/uapi -Wall
-soft-dirty: soft-dirty.c
-
-all: soft-dirty
-
-clean:
-	rm -f soft-dirty
-
-run_tests: all
-	@./soft-dirty || echo "soft-dirty selftests: [FAIL]"

tools/testing/selftests/soft-dirty/soft-dirty.c

-#include <stdlib.h>
-#include <stdio.h>
-#include <sys/mman.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/types.h>
-
-typedef unsigned long long u64;
-
-#define PME_PRESENT	(1ULL << 63)
-#define PME_SOFT_DIRTY	(1Ull << 55)
-
-#define PAGES_TO_TEST	3
-#ifndef PAGE_SIZE
-#define PAGE_SIZE	4096
-#endif
-
-static void get_pagemap2(char *mem, u64 *map)
-{
-	int fd;
-
-	fd = open("/proc/self/pagemap2", O_RDONLY);
-	if (fd < 0) {
-		perror("Can't open pagemap2");
-		exit(1);
-	}
-
-	lseek(fd, (unsigned long)mem / PAGE_SIZE * sizeof(u64), SEEK_SET);
-	read(fd, map, sizeof(u64) * PAGES_TO_TEST);
-	close(fd);
-}
-
-static inline char map_p(u64 map)
-{
-	return map & PME_PRESENT ? 'p' : '-';
-}
-
-static inline char map_sd(u64 map)
-{
-	return map & PME_SOFT_DIRTY ? 'd' : '-';
-}
-
-static int check_pte(int step, int page, u64 *map, u64 want)
-{
-	if ((map[page] & want) != want) {
-		printf("Step %d Page %d has %c%c, want %c%c\n",
-				step, page,
-				map_p(map[page]), map_sd(map[page]),
-				map_p(want), map_sd(want));
-		return 1;
-	}
-
-	return 0;
-}
-
-static void clear_refs(void)
-{
-	int fd;
-	char *v = "4";
-
-	fd = open("/proc/self/clear_refs", O_WRONLY);
-	if (write(fd, v, 3) < 3) {
-		perror("Can't clear soft-dirty bit");
-		exit(1);
-	}
-	close(fd);
-}
-
-int main(void)
-{
-	char *mem, x;
-	u64 map[PAGES_TO_TEST];
-
-	mem = mmap(NULL, PAGES_TO_TEST * PAGE_SIZE,
-			PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0, 0);
-
-	x = mem[0];
-	mem[2 * PAGE_SIZE] = 'c';
-	get_pagemap2(mem, map);
-
-	if (check_pte(1, 0, map, PME_PRESENT))
-		return 1;
-	if (check_pte(1, 1, map, 0))
-		return 1;
-	if (check_pte(1, 2, map, PME_PRESENT | PME_SOFT_DIRTY))
-		return 1;
-
-	clear_refs();
-	get_pagemap2(mem, map);
-
-	if (check_pte(2, 0, map, PME_PRESENT))
-		return 1;
-	if (check_pte(2, 1, map, 0))
-		return 1;
-	if (check_pte(2, 2, map, PME_PRESENT))
-		return 1;
-
-	mem[0] = 'a';
-	mem[PAGE_SIZE] = 'b';
-	x = mem[2 * PAGE_SIZE];
-	get_pagemap2(mem, map);
-
-	if (check_pte(3, 0, map, PME_PRESENT | PME_SOFT_DIRTY))
-		return 1;
-	if (check_pte(3, 1, map, PME_PRESENT | PME_SOFT_DIRTY))
-		return 1;
-	if (check_pte(3, 2, map, PME_PRESENT))
-		return 1;
-
-	(void)x; /* gcc warn */
-
-	printf("PASS\n");
-	return 0;
-}