This patch fixes SMP boot on Apple Xserve G5

From: Stephen Rothwell <sfr@canb.auug.org.au>

It is possible to attach a virtual disk to a logical partition on an iSeries
machine so that it is read only to the partition.  This patch allows Linux to
use such virtual disks.

From: Paul Mackerras <paulus@samba.org>

After I sent the recent patch to include/asm-ppc64/io.h which put stronger
barriers in the I/O accessor macros, Paul McKenney pointed out to me that a
writex/outx could still slide out from inside a spinlocked region.  This patch
makes the barriers a bit stronger so that this can't happen.  It means that we
need to use a sync instruction for wmb (a full "heavyweight" sync), since
drivers rely on wmb for ordering between writes to system memory and writes to
a device.

I have left smb_wmb() as a lighter-weight barrier that orders stores, and
doesn't impose an ordering between cacheable and non-cacheable accesses (the
amusingly-named eieio instruction).  I am assuming here that smp_wmb is only
used for ordering stores to system memory so that another cpu will see them in
order.  It can't be used for enforcing any ordering that a device will see,
because it is just a gcc barrier on UP.

This also changes the spinlock/rwlock unlock code to use lwsync ("light-weight
sync") rather than eieio, since eieio doesn't order loads, and we need to
ensure that loads stay inside the spinlocked region.

From: Paul Mackerras <paulus@samba.org>

When I sent the patch to uninline the spinlocks, I inadvertently left out
the change to arch/ppc64/Kconfig which defines the config symbol for
inlining the locks (CONFIG_SPINLINE now).  This patch adds it.  It also
adds a symbol CONFIG_PPC_SPLPAR which enables the code for calling the
hypervisor on shared-processor logically-partitioned system to yield the
physical processor to the lock holder when spinning.  (The code that
depends on this symbol is already present in arch/ppc64/lib/locks.c.)

From: Anton Blanchard <anton@samba.org>

It turns out we do avoid irq recursion on iseries so remove the workaround.

From: Anton Blanchard <anton@samba.org>

We check nvram_fetch/nvram_store against -1, so better not make these
unsigned.

From: Anton Blanchard <anton@samba.org>

Based on feedback from the hardware guys align jiffies and tb_last_stamp.
We update both regularly and there are other read only, heavily accessed
things that share those cachelines.

From: Anton Blanchard <anton@samba.org>

We need to set MSR_RI in iseries exception prolog.

From: Anton Blanchard <anton@samba.org>

We were allocating radix tree nodes in the interrupt code with GFP_KERNEL
under a spinlock.  Change it to GFP_ATOMIC.

From: Paul Mackerras <paulus@samba.org>

The patch below moves some declarations from C files into the appropriate
header file in include/asm-ppc (and removes an unused local variable in a
function).

From: Paul Mackerras <paulus@samba.org>

Matt Porter's recent changes broke the compile for non-4xx ppc32 systems,
unfortunately.  I get an error that mfdcr is not defined in
include/asm-ppc/ocp.h when compiling for powermac (reasonable, since the
mfdcr instruction only exists on 4xx processors).  The patch below fixes
it.

From: Matt Porter <mporter@kernel.crashing.org>

Merge all current PPC44x ports against new OCP.

From: Matt Porter <mporter@kernel.crashing.org>

Merge all current PPC40x ports against new OCP.

From: Matt Porter <mporter@kernel.crashing.org>

Update all current 4xx defconfigs for new OCP.

From: Matt Porter <mporter@kernel.crashing.org>

Merge misc.  4xx core fixes and support for the new cascade scheme in the
440gx.

From: Matt Porter <mporter@kernel.crashing.org>

Merge PPC4xx-specific OCP support for new OCP core.

From: Matt Porter <mporter@kernel.crashing.org>

Merge PPC44x library support against new OCP.

From: Matt Porter <mporter@kernel.crashing.org>

Merge Bubinga/405EP support against new OCP.

From: Matt Porter <mporter@kernel.crashing.org>

New OCP infrastructure ported from 2.4 along with several enhancements. 
Updated patch with comments from hch and Valdis.

From: Matt Porter <mporter@kernel.crashing.org>

Adds general Book E machine check exception support and PPC44x-specific
machine check exception implementation.

From: Matt Porter <mporter@kernel.crashing.org>

Adds general Book E debug exception support and PPC44x-specific debug
exception implementation.

From: Matt Porter <mporter@kernel.crashing.org>

This patch fixes the condition where prefetching cache lines beyond a
buffer can cause data corruption on non cache coherent PPCs.  It is a port
of the version that went into 2.4.  From Eugene Surovegin
<ebs@ebshome.net>.

From: Matt Porter <mporter@kernel.crashing.org>

This patch implements/uses __flush_dcache_icache_page() which kmaps on a
Book E part, but keeps the existing behavior on other PowerPCs which can
disable the MMU.

From: Olaf Hering <olh@suse.de>

ext3 as module is not possible in 2.6.6, clear_pages, called from clear_page,
is not exported.

Also, unexport clear_page(), which is an inline.

Jorn Engel <joern@wohnheim.fh-wedel.de>

inode->i_flags should never contain fs-specific flags.  In fact, it doesn't;
the checks against it cause "chattr +T" to be useless for ext[23].  Same bug
was in befs as well.

From: "Sergey S. Kostyliov" <rathamahata@php4.ru>

Acked by Will Dyson.

From: "Sergey S. Kostyliov" <rathamahata@php4.ru>

- Reduce stack usage.
- Kill useless duplication of error and warning messages when debug is on. Old
	behaviour was:
...
BeFS(hda1): 

From: "Sergey S. Kostyliov" <rathamahata@php4.ru>

Fix really old typo in config help

From: "Sergey S. Kostyliov" <rathamahata@php4.ru>

Move value initialisation out of the loop body.

From: "Sergey S. Kostyliov" <rathamahata@php4.ru>

We already have block number (inode->i_ino), so there is no need to calculate
it from befs_block_run before sb_bread() call (this is what befs_bread_iaddr()
do).

From: "Sergey S. Kostyliov" <rathamahata@php4.ru>

LBD patch merged long time ago, so it is safe to pass u64 block numbers to
sb_bread() when sector_t is large enough.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Network driver changes:
 - lcs: Add missing irb error checking.
 - lcs: Fix multicasting.
 - lcs: Use a seperate lock (ipm_lock) for multicast list.
 - lcs: Add missing in_dev_put in multicase address list handling.
 - iucv: Set static variables to NULL after kfree.
 - iucv: Do bus_unregister if module initialization fails.
 - netiucv: Convert iucvMagic to EBCDIC in con_action_start.
 - netiucv: Remove administration of ifno-stuff for device name,
 - netiucv: Add attribute to remove a netiucv device.
 - qeth: Add version string that is displayed at driver load time.
 - qeth: Fix memory leak in qeth_arp_query.
 - qeth: Remove duplicate case statements in qeth_do_ioctl.
 - qeth: Fix OSA broadcast filtering.
 - qeth: Increase timeout for purge ARP cache IPA.
 - qeth: Fix hsi device naming.
 - qeth: Add do_QDIO count to qeth performance statistics.
 - qeth: Allow writing to IP address takeover attribute only in
         state DOWN or RECOVER.
 - qeth: Fix hang when removing a vlan device.
 - qeth: Cleanup error messages for ARP commands.
 - qeth: Return EOPNOTSUPP for purge ARP on HiperSockets.
 - qeth: Drop skbs if the net_device of a qeth device is down.
 - qeth: Simplify ip address list processing.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

zfcp host adapter change:
 - Prevent infinite retry of SCSI commands when FCP adapter is unavailable.
 - Always queue error recovery structure to the error recovery running list.
 - Add help text to zfcp config option.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

3270 device driver change:
 - Don't allow activation of views while the initial size sensing is still
   in progress. Replace RAW3270_FLAGS_SHUTDOWN with RAW3270_FLAGS_READY.
 - Make 3270 views loadable as modules.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

dasd driver changes:
 - Do error recovery for error recovery requests.
 - Retry request if the start_IO failed because of a timeout.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Common i/o layer changes:
 - Delay unregister/register of ccw devices reappering on a different
   subchannel. Search for the old ccw_device & subchannel for the
   reattached device and deregister it too to avoid inconsistencies.
 - Fix path grouping for devices that present command reject for
   SetPGID but not for SensePGID.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

s390 core changes:
 - Rename idle_cpu_mask to nohz_cpu_mask as agreed with Dipankar.
 - Refine compiler version check for "Q" constraints in uaccess.h.
 - Store per process ptrace information to the correct place.
 - Fix per cpu data access for 64-bit modules.
 - Add topology_init function for cpu hotplug.
 - Define TASK_SIZE dependent on TIF_31BIT and define MM_VM_SIZE
   to 4TB to get rid of elf_map32 and arch_get_unmapped_area.

From: Geoff Gustafson <geoff@linux.jf.intel.com>,
      "Chen, Kenneth W" <kenneth.w.chen@intel.com>,
      Ingo Molnar <mingo@elte.hu>,
      me.

The big-SMP guys are seeing high CPU load due to del_timer_sync()'s
inefficiencies.  The callers are fs/aio.c and schedule_timeout().

We note that neither of these callers' timer handlers actually re-add the
timer - they are single-shot.

So we don't need all that complexity in del_timer_sync() - we can just run
del_timer() and if that worked we know the timer is dead.

Add del_single_shot_timer(), export it to modules and use it in AIO and
schedule_timeout().


(these numbers are for an earlier patch, but they'll be close)

Before:             32p     4p
     Warm cache   29,000    505
     Cold cache   37,800   1220

After:              32p     4p
     Warm cache       95     88
     Cold cache    1,800    140

[Measurements are CPU cycles spent in a call to del_timer_sync, the average
of 1000 calls. 32p is 16-node NUMA, 4p is SMP.]

(I cleaned up a few things and added some commentary)

From: Yoshinori Sato <ysato@users.sourceforge.jp>

- gcc-3.4 warning fix.
- io access address fix.
- cleanup code.

From: Yoshinori Sato <ysato@users.sourceforge.jp>

- Delete obsolete header files