[IA64-SGI] sparse cleanups & misc fixes for sn2

This is a big patch mostly because I trimmed shub_mmr.h down from 17M to 11k
or so.  It fixes a number of things sparse discovered and removes some dead
code, fixes up some prototypes, etc.  Of note:
 
o sn_proc_fs.c was directly dereferencing user pointers, fixed
o sn_hwperf.c was missing an include and was using asm-ia64 directly
o the I/O routines were all missing proper sparse annotations
o dead code in prominfo_proc.c has been removed
o fix generic build by putting numionodes into asm/sn/io.h

With this patch applied, the check build is pretty clean.  The sn_console bit
depends on some of the other changes, so it's included here.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/sn/include/pci/pcidev.h

@@ -13,7 +13,7 @@
 extern struct sn_irq_info **sn_irq;
 
 #define SN_PCIDEV_INFO(pci_dev) \
-        ((struct pcidev_info *)((pci_dev)->sysdata))
+        ((struct pcidev_info *)(pci_dev)->sysdata)
 
 /*
  * Given a pci_bus, return the sn pcibus_bussoft struct.  Note that
@@ -48,4 +48,7 @@ struct pcidev_info {
 	struct sn_irq_info	*pdi_sn_irq_info;
 };
 
+extern void sn_irq_fixup(struct pci_dev *pci_dev,
+			 struct sn_irq_info *sn_irq_info);
+
 #endif				/* _ASM_IA64_SN_PCI_PCIDEV_H */

arch/ia64/sn/include/pci/pic.h

@@ -56,7 +56,7 @@
  */
 
 #define PIC_ATE_TARGETID_SHFT           8
-#define PIC_HOST_INTR_ADDR              0x0000FFFFFFFFFFFF
+#define PIC_HOST_INTR_ADDR              0x0000FFFFFFFFFFFFUL
 #define PIC_PCI64_ATTR_TARG_SHFT        60
 
 

arch/ia64/sn/include/pci/tiocp.h

@@ -8,7 +8,7 @@
 #ifndef _ASM_IA64_SN_PCI_TIOCP_H
 #define _ASM_IA64_SN_PCI_TIOCP_H
 
-#define TIOCP_HOST_INTR_ADDR            0x003FFFFFFFFFFFFF
+#define TIOCP_HOST_INTR_ADDR            0x003FFFFFFFFFFFFFUL
 #define TIOCP_PCI64_CMDTYPE_MEM         (0x1ull << 60)
 
 

arch/ia64/sn/include/shub.h

@@ -23,17 +23,17 @@
  *   SH_JUNK_BUS_LED0-3, defined in shub_mmr.h
  *		
  */
-#define SH_REAL_JUNK_BUS_LED0           0x7fed00000
-#define SH_REAL_JUNK_BUS_LED1           0x7fed10000
-#define SH_REAL_JUNK_BUS_LED2           0x7fed20000
-#define SH_REAL_JUNK_BUS_LED3           0x7fed30000
-#define SH_JUNK_BUS_UART0               0x7fed40000
-#define SH_JUNK_BUS_UART1               0x7fed40008
-#define SH_JUNK_BUS_UART2               0x7fed40010
-#define SH_JUNK_BUS_UART3               0x7fed40018
-#define SH_JUNK_BUS_UART4               0x7fed40020
-#define SH_JUNK_BUS_UART5               0x7fed40028
-#define SH_JUNK_BUS_UART6               0x7fed40030
-#define SH_JUNK_BUS_UART7               0x7fed40038
+#define SH_REAL_JUNK_BUS_LED0           0x7fed00000UL
+#define SH_REAL_JUNK_BUS_LED1           0x7fed10000UL
+#define SH_REAL_JUNK_BUS_LED2           0x7fed20000UL
+#define SH_REAL_JUNK_BUS_LED3           0x7fed30000UL
+#define SH_JUNK_BUS_UART0               0x7fed40000UL
+#define SH_JUNK_BUS_UART1               0x7fed40008UL
+#define SH_JUNK_BUS_UART2               0x7fed40010UL
+#define SH_JUNK_BUS_UART3               0x7fed40018UL
+#define SH_JUNK_BUS_UART4               0x7fed40020UL
+#define SH_JUNK_BUS_UART5               0x7fed40028UL
+#define SH_JUNK_BUS_UART6               0x7fed40030UL
+#define SH_JUNK_BUS_UART7               0x7fed40038UL
 
 #endif /* _ASM_IA64_SN_SHUB_H */

arch/ia64/sn/kernel/io_init.c

@@ -200,8 +200,6 @@ static void sn_pci_fixup_slot(struct pci_dev *dev)
 	struct sn_irq_info *sn_irq_info;
 	struct pci_dev *host_pci_dev;
 	int status = 0;
-	extern void sn_irq_fixup(struct pci_dev *pci_dev,
-				 struct sn_irq_info *sn_irq_info);
 
 	SN_PCIDEV_INFO(dev) = kmalloc(sizeof(struct pcidev_info), GFP_KERNEL);
 	if (SN_PCIDEV_INFO(dev) <= 0)

arch/ia64/sn/kernel/iomv.c

@@ -27,7 +27,7 @@ void *sn_io_addr(unsigned long port)
 	if (!IS_RUNNING_ON_SIMULATOR()) {
 		/* On sn2, legacy I/O ports don't point at anything */
 		if (port < (64 * 1024))
-			return 0;
+			return NULL;
 		return ((void *)(port | __IA64_UNCACHED_OFFSET));
 	} else {
 		/* but the simulator uses them... */
@@ -41,8 +41,7 @@ void *sn_io_addr(unsigned long port)
 		 */
 		if ((port >= 0x1f0 && port <= 0x1f7) ||
 		    port == 0x3f6 || port == 0x3f7) {
-			io_base =
-			    (0xc000000fcc000000 |
+			io_base = (0xc000000fcc000000UL |
 				   ((unsigned long)get_nasid() << 38));
 			addr = io_base | ((port >> 2) << 12) | (port & 0xfff);
 		} else {
@@ -69,11 +68,10 @@ EXPORT_SYMBOL(sn_io_addr);
  */
 void sn_mmiob(void)
 {
-	while ((((volatile unsigned long)(*pda->
-					  pio_write_status_addr)) &
+	while ((((volatile unsigned long)(*pda->pio_write_status_addr)) &
 		SH_PIO_WRITE_STATUS_0_PENDING_WRITE_COUNT_MASK) !=
 	       SH_PIO_WRITE_STATUS_0_PENDING_WRITE_COUNT_MASK)
-		udelay(1);
+		cpu_relax();
 }
 
 EXPORT_SYMBOL(sn_mmiob);

arch/ia64/sn/kernel/setup.c

@@ -90,7 +90,7 @@ int numionodes;
  * early_printk won't try to access the UART before
  * master_node_bedrock_address is properly calculated.
  */
-u64 master_node_bedrock_address;
+u64 __iomem *master_node_bedrock_address;
 
 static void sn_init_pdas(char **);
 static void scan_for_ionodes(void);
@@ -196,10 +196,10 @@ void __init early_sn_setup(void)
 	}
 
 	if (IS_RUNNING_ON_SIMULATOR()) {
-		master_node_bedrock_address =
-		    (u64) REMOTE_HUB(get_nasid(), SH_JUNK_BUS_UART0);
-		printk(KERN_DEBUG
-		       "early_sn_setup: setting master_node_bedrock_address to 0x%lx\n",
+		master_node_bedrock_address = (u64 __iomem *)
+			REMOTE_HUB(get_nasid(), SH_JUNK_BUS_UART0);
+		printk(KERN_DEBUG "early_sn_setup: setting "
+		       "master_node_bedrock_address to 0x%p\n",
 		       master_node_bedrock_address);
 	}
 }
@@ -313,10 +313,10 @@ void __init sn_setup(char **cmdline_p)
 	platform_intr_list[ACPI_INTERRUPT_CPEI] = IA64_CPE_VECTOR;
 
 	if (IS_RUNNING_ON_SIMULATOR()) {
-		master_node_bedrock_address =
-		    (u64) REMOTE_HUB(get_nasid(), SH_JUNK_BUS_UART0);
-		printk(KERN_DEBUG
-		       "sn_setup: setting master_node_bedrock_address to 0x%lx\n",
+		master_node_bedrock_address = (u64 __iomem *)
+			REMOTE_HUB(get_nasid(), SH_JUNK_BUS_UART0);
+		printk(KERN_DEBUG "sn_setup: setting "
+		       "master_node_bedrock_address to 0x%p\n",
 		       master_node_bedrock_address);
 	}
 

arch/ia64/sn/kernel/sn2/io.c

@@ -58,42 +58,42 @@ void __sn_outl(unsigned int val, unsigned long port)
 	___sn_outl(val, port);
 }
 
-unsigned char __sn_readb(void *addr)
+unsigned char __sn_readb(void __iomem *addr)
 {
 	return ___sn_readb(addr);
 }
 
-unsigned short __sn_readw(void *addr)
+unsigned short __sn_readw(void __iomem *addr)
 {
 	return ___sn_readw(addr);
 }
 
-unsigned int __sn_readl(void *addr)
+unsigned int __sn_readl(void __iomem *addr)
 {
 	return ___sn_readl(addr);
 }
 
-unsigned long __sn_readq(void *addr)
+unsigned long __sn_readq(void __iomem *addr)
 {
 	return ___sn_readq(addr);
 }
 
-unsigned char __sn_readb_relaxed(void *addr)
+unsigned char __sn_readb_relaxed(void __iomem *addr)
 {
 	return ___sn_readb_relaxed(addr);
 }
 
-unsigned short __sn_readw_relaxed(void *addr)
+unsigned short __sn_readw_relaxed(void __iomem *addr)
 {
 	return ___sn_readw_relaxed(addr);
 }
 
-unsigned int __sn_readl_relaxed(void *addr)
+unsigned int __sn_readl_relaxed(void __iomem *addr)
 {
 	return ___sn_readl_relaxed(addr);
 }
 
-unsigned long __sn_readq_relaxed(void *addr)
+unsigned long __sn_readq_relaxed(void __iomem *addr)
 {
 	return ___sn_readq_relaxed(addr);
 }

arch/ia64/sn/kernel/sn2/prominfo_proc.c

@@ -91,122 +91,11 @@ static const char *fit_type_name(unsigned char type)
 	return "Unknown type";
 }
 
-
-/* ============ BEGIN temp til old PROMs are no longer supported =============
- *
- * The OS should not make direct access to the PROM flash memory. Access to
- * this region must be serialized with a PROM lock. If SAL on one cpu is
- * updating the FLASH error log at the same time another cpu is accessing the
- * PROM, data corruption will occur.
- *
- * To solve the problem, all flash PROM access has been moved to SAL. Because
- * not all systems will have instant PROM updates, we need to support a new OS
- * running on a system with old PROMs.
- *
- * This code should be deleted after 1 OS/PROM release has occurred & the OS
- * no longer supports downrev PROMs. (PROM support should be in the 3.50
- * PROMs).
- */
-#define SUPPORT_OLD_PROMS
-#ifdef SUPPORT_OLD_PROMS
-
-
-#define FIT_SIGNATURE		0x2020205f5449465ful
-
-/* Sub-regions determined by bits in Node Offset */
-#define	LB_PROM_SPACE		0x0000000700000000ul	/* Local LB PROM */
-
-/* Offset of PROM banner pointers in SAL A and SAL B */
-#define SAL_A_BANNER_OFFSET	(1 * 16)
-#define SAL_B_BANNER_OFFSET	(3 * 16)
-
-/* Architected IA64 firmware space */
-#define FW_BASE                 0x00000000FF000000
-#define FW_TOP                  0x0000000100000000
-
-static unsigned long convert_fw_addr(nasid_t nasid, unsigned long addr)
-{
-	/* snag just the node-relative offset */
-	addr &= ~0ul >> (63 - 35);
-	/* the pointer to SAL A is relative to IA-64 compatibility
-	 * space.  However, the PROM is mapped at a different offset
-	 * in MMR space (both local and global)
-	 */
-	addr += 0x700000000;
-	return GLOBAL_MMR_ADDR(nasid, addr);
-}
-
-static int valid_fw_addr(unsigned long addr)
-{
-	addr &= ~(1ul << 63);	/* Clear cached/uncached bit */
-	return (addr >= FW_BASE && addr < FW_TOP);
-}
-
-static unsigned long *
-lookup_fit(int nasid)
-{
-	unsigned long *fitp;
-	unsigned long fit_paddr;
-	unsigned long *fit_vaddr;
-
-	fitp = (void *)GLOBAL_MMR_ADDR(nasid, LB_PROM_SPACE - 32);
-	fit_paddr = readq(fitp);
-	fit_vaddr = (unsigned long *) convert_fw_addr(nasid, fit_paddr);
-	return fit_vaddr;
-}
-#endif /* SUPPORT_OLD_PROMS */
-/* ============ END temp til old PROMs are no longer supported ============= */
-
 static int
 get_fit_entry(unsigned long nasid, int index, unsigned long *fentry,
 	      char *banner, int banlen)
 {
-	int ret;
-
-	ret = ia64_sn_get_fit_compt(nasid, index, fentry, banner, banlen);
-
-#ifdef SUPPORT_OLD_PROMS
-	/* The following is hack is temporary until PROMs are updated */
-	if (ret == SALRET_NOT_IMPLEMENTED) {
-		unsigned long *fitadr = lookup_fit(nasid);
-		int nentries;
-
-		if (readq(fitadr) != FIT_SIGNATURE) {
-			printk(KERN_WARNING "Unrecognized FIT signature");
-			return -2;
-		}
-
-		nentries = (unsigned int) (readq(fitadr + 1) & 0xffffff);
-		if (index >= nentries)
-			return -2;
-
-		fentry[0] = readq(fitadr + 2 * index);
-		fentry[1] = readq(fitadr + 2 * index + 1);
-		ret = 0;
-
-		if (banner && FIT_TYPE(fentry[1]) == FIT_ENTRY_SAL_A) {
-			unsigned long i, qw, *bwp, *qwp;
-
-			banner[0] = '\0';
-			qw = fentry[0];	/* Address of SAL A */
-			if (!valid_fw_addr(qw))
-				return 0;
-
-			qw += SAL_A_BANNER_OFFSET;
-			qw = convert_fw_addr(nasid, qw);
-
-			qw = readq(qw);			/* Address of banner */
-			if (!valid_fw_addr(qw))
-				return 0;
-			qw = convert_fw_addr(nasid, qw);
-			qwp = (unsigned long *) qw;
-			bwp = (unsigned long *) banner;
-			for (i=0; i<banlen/8; i++)
-				bwp[i] = qwp[i];
-		}
-	}
-#endif /* SUPPORT_OLD_PROMS */
-	return ret;
+	return ia64_sn_get_fit_compt(nasid, index, fentry, banner, banlen);
 }
 
 

arch/ia64/sn/kernel/sn2/sn_hwperf.c

@@ -36,18 +36,18 @@
 #include <asm/semaphore.h>
 #include <asm/segment.h>
 #include <asm/uaccess.h>
-#include <asm-ia64/sal.h>
-#include <asm-ia64/sn/sn_sal.h>
+#include <asm/sal.h>
+#include <asm/sn/io.h>
+#include <asm/sn/sn_sal.h>
 #include <asm/sn/module.h>
 #include <asm/sn/geo.h>
-#include <asm-ia64/sn/sn2/sn_hwperf.h>
+#include <asm/sn/sn2/sn_hwperf.h>
 
 static void *sn_hwperf_salheap = NULL;
 static int sn_hwperf_obj_cnt = 0;
 static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
 static int sn_hwperf_init(void);
 static DECLARE_MUTEX(sn_hwperf_init_mutex);
-extern int numionodes;
 
 static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
 {
@@ -407,7 +407,7 @@ sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 		r = -EINVAL;
 		goto error;
 	}
-	r = copy_from_user(&a, (const void *)arg,
+	r = copy_from_user(&a, (const void __user *)arg,
 		sizeof(struct sn_hwperf_ioctl_args));
 	if (r != 0) {
 		r = -EFAULT;
@@ -428,7 +428,7 @@ sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 	}
 
 	if (op & SN_HWPERF_OP_MEM_COPYIN) {
-		r = copy_from_user(p, (const void *)a.ptr, a.sz);
+		r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
 		if (r != 0) {
 			r = -EFAULT;
 			goto error;
@@ -528,7 +528,7 @@ sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 	}
 
 	if (op & SN_HWPERF_OP_MEM_COPYOUT) {
-		r = copy_to_user((void *)a.ptr, p, a.sz);
+		r = copy_to_user((void __user *)a.ptr, p, a.sz);
 		if (r != 0) {
 			r = -EFAULT;
 			goto error;

arch/ia64/sn/kernel/sn2/sn_proc_fs.c

@@ -62,9 +62,14 @@ static int sn_force_interrupt_show(struct seq_file *s, void *p)
 }
 
 static ssize_t sn_force_interrupt_write_proc(struct file *file,
-		const __user char *buffer, size_t count, loff_t *data)
+		const char __user *buffer, size_t count, loff_t *data)
 {
-	sn_force_interrupt_flag = (*buffer == '0') ? 0 : 1;
+	char val;
+
+	if (copy_from_user(&val, buffer, 1))
+		return -EFAULT;
+
+	sn_force_interrupt_flag = (val == '0') ? 0 : 1;
 	return count;
 }
 
@@ -116,7 +121,7 @@ void register_sn_procfs(void)
 	struct proc_dir_entry *e;
 
 	BUG_ON(sgi_proc_dir != NULL);
-	if (!(sgi_proc_dir = proc_mkdir("sgi_sn", 0)))
+	if (!(sgi_proc_dir = proc_mkdir("sgi_sn", NULL)))
 		return;
 
 	sn_procfs_create_entry("partition_id", sgi_proc_dir,

drivers/serial/sn_console.c

@@ -108,7 +108,7 @@ static struct sn_cons_port sal_console_port;
 /* Only used if USE_DYNAMIC_MINOR is set to 1 */
 static struct miscdevice misc;	/* used with misc_register for dynamic */
 
-extern u64 master_node_bedrock_address;
+extern u64 __iomem *master_node_bedrock_address;
 extern void early_sn_setup(void);
 
 #undef DEBUG

include/asm-ia64/machvec.h

@@ -62,14 +62,14 @@ typedef unsigned int ia64_mv_inl_t (unsigned long);
 typedef void ia64_mv_outb_t (unsigned char, unsigned long);
 typedef void ia64_mv_outw_t (unsigned short, unsigned long);
 typedef void ia64_mv_outl_t (unsigned int, unsigned long);
-typedef unsigned char ia64_mv_readb_t (void *);
-typedef unsigned short ia64_mv_readw_t (void *);
-typedef unsigned int ia64_mv_readl_t (void *);
-typedef unsigned long ia64_mv_readq_t (void *);
-typedef unsigned char ia64_mv_readb_relaxed_t (void *);
-typedef unsigned short ia64_mv_readw_relaxed_t (void *);
-typedef unsigned int ia64_mv_readl_relaxed_t (void *);
-typedef unsigned long ia64_mv_readq_relaxed_t (void *);
+typedef unsigned char ia64_mv_readb_t (void __iomem *);
+typedef unsigned short ia64_mv_readw_t (void __iomem *);
+typedef unsigned int ia64_mv_readl_t (void __iomem *);
+typedef unsigned long ia64_mv_readq_t (void __iomem *);
+typedef unsigned char ia64_mv_readb_relaxed_t (void __iomem *);
+typedef unsigned short ia64_mv_readw_relaxed_t (void __iomem *);
+typedef unsigned int ia64_mv_readl_relaxed_t (void __iomem *);
+typedef unsigned long ia64_mv_readq_relaxed_t (void __iomem *);
 
 static inline void
 machvec_noop (void)

include/asm-ia64/sn/addrs.h

@@ -69,27 +69,27 @@ typedef union ia64_sn2_pa {
 } ia64_sn2_pa_t;
 #endif
 
-#define TO_PHYS_MASK		0x0001ffcfffffffff	/* Note - clear AS bits */
+#define TO_PHYS_MASK		0x0001ffcfffffffffUL	/* Note - clear AS bits */
 
 
 /* Regions determined by AS */
-#define LOCAL_MMR_SPACE		0xc000008000000000	/* Local MMR space */
-#define LOCAL_PHYS_MMR_SPACE	0x8000008000000000	/* Local PhysicalMMR space */
-#define LOCAL_MEM_SPACE		0xc000010000000000	/* Local Memory space */
+#define LOCAL_MMR_SPACE		0xc000008000000000UL	/* Local MMR space */
+#define LOCAL_PHYS_MMR_SPACE	0x8000008000000000UL	/* Local PhysicalMMR space */
+#define LOCAL_MEM_SPACE		0xc000010000000000UL	/* Local Memory space */
 /* It so happens that setting bit 35 indicates a reference to the SHUB or TIO
  * MMR space.  
  */
-#define GLOBAL_MMR_SPACE	0xc000000800000000	/* Global MMR space */
-#define TIO_MMR_SPACE		0xc000000800000000	/* TIO MMR space */
-#define ICE_MMR_SPACE		0xc000000000000000	/* ICE MMR space */
-#define GLOBAL_PHYS_MMR_SPACE	0x0000000800000000	/* Global Physical MMR space */
-#define GET_SPACE		0xe000001000000000	/* GET space */
-#define AMO_SPACE		0xc000002000000000	/* AMO space */
-#define CACHEABLE_MEM_SPACE	0xe000003000000000	/* Cacheable memory space */
-#define UNCACHED                0xc000000000000000      /* UnCacheable memory space */
-#define UNCACHED_PHYS           0x8000000000000000      /* UnCacheable physical memory space */
-
-#define PHYS_MEM_SPACE		0x0000003000000000	/* physical memory space */
+#define GLOBAL_MMR_SPACE	0xc000000800000000UL	/* Global MMR space */
+#define TIO_MMR_SPACE		0xc000000800000000UL	/* TIO MMR space */
+#define ICE_MMR_SPACE		0xc000000000000000UL	/* ICE MMR space */
+#define GLOBAL_PHYS_MMR_SPACE	0x0000000800000000UL	/* Global Physical MMR space */
+#define GET_SPACE		0xe000001000000000UL	/* GET space */
+#define AMO_SPACE		0xc000002000000000UL	/* AMO space */
+#define CACHEABLE_MEM_SPACE	0xe000003000000000UL	/* Cacheable memory space */
+#define UNCACHED                0xc000000000000000UL	/* UnCacheable memory space */
+#define UNCACHED_PHYS           0x8000000000000000UL	/* UnCacheable physical memory space */
+
+#define PHYS_MEM_SPACE		0x0000003000000000UL	/* physical memory space */
 
 /* SN2 address macros */
 /* NID_SHFT has the right value for both SHUB and TIO addresses.*/
@@ -105,7 +105,7 @@ typedef union ia64_sn2_pa {
 #define GLOBAL_MEM_ADDR(n,a)	(CACHEABLE_MEM_SPACE | REMOTE_ADDR(n,a))
 
 /* non-II mmr's start at top of big window space (4G) */
-#define BWIN_TOP		0x0000000100000000
+#define BWIN_TOP		0x0000000100000000UL
 
 /*
  * general address defines - for code common to SN0/SN1/SN2
@@ -256,7 +256,7 @@ typedef union ia64_sn2_pa {
         (((~(_x)) & BWIN_TOP)>>9)    | (_x))
 
 #define REMOTE_HUB(_n, _x)						\
-	((volatile uint64_t *)(REMOTE_HUB_BASE(_x) | ((((long)(_n))<<NASID_SHFT))))
+	((uint64_t *)(REMOTE_HUB_BASE(_x) | ((((long)(_n))<<NASID_SHFT))))
 
 
 /*

include/asm-ia64/sn/io.h

@@ -129,44 +129,44 @@ ___sn_outl (unsigned int val, unsigned long port)
  */
 
 static inline unsigned char
-___sn_readb (void *addr)
+___sn_readb (void __iomem *addr)
 {
 	unsigned char val;
 
-	val = *(volatile unsigned char *)addr;
+	val = *(volatile unsigned char __force *)addr;
 	__sn_mf_a();
 	sn_dma_flush((unsigned long)addr);
         return val;
 }
 
 static inline unsigned short
-___sn_readw (void *addr)
+___sn_readw (void __iomem *addr)
 {
 	unsigned short val;
 
-	val = *(volatile unsigned short *)addr;
+	val = *(volatile unsigned short __force *)addr;
 	__sn_mf_a();
 	sn_dma_flush((unsigned long)addr);
         return val;
 }
 
 static inline unsigned int
-___sn_readl (void *addr)
+___sn_readl (void __iomem *addr)
 {
 	unsigned int val;
 
-	val = *(volatile unsigned int *) addr;
+	val = *(volatile unsigned int __force *)addr;
 	__sn_mf_a();
 	sn_dma_flush((unsigned long)addr);
         return val;
 }
 
 static inline unsigned long
-___sn_readq (void *addr)
+___sn_readq (void __iomem *addr)
 {
 	unsigned long val;
 
-	val = *(volatile unsigned long *) addr;
+	val = *(volatile unsigned long __force *)addr;
 	__sn_mf_a();
 	sn_dma_flush((unsigned long)addr);
         return val;