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Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

#ifndef __ASM_APIC_H
#define __ASM_APIC_H

#include <linux/pm.h>
#include <linux/delay.h>
#include <asm/fixmap.h>
#include <asm/apicdef.h>
#include <asm/processor.h>
#include <asm/system.h>

#define Dprintk(x...)

/*
 * Debugging macros
 */
#define APIC_QUIET   0
#define APIC_VERBOSE 1
#define APIC_DEBUG   2

extern int apic_verbosity;

/*
 * Define the default level of output to be very little
 * This can be turned up by using apic=verbose for more
 * information and apic=debug for _lots_ of information.
 * apic_verbosity is defined in apic.c
 */
#define apic_printk(v, s, a...) do {       \
		if ((v) <= apic_verbosity) \
			printk(s, ##a);    \
	} while (0)


extern void generic_apic_probe(void);

#ifdef CONFIG_X86_LOCAL_APIC

/*
 * Basic functions accessing APICs.
 */
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#define apic_write native_apic_write
#define apic_write_atomic native_apic_write_atomic
#define apic_read native_apic_read
#define setup_boot_clock setup_boot_APIC_clock
#define setup_secondary_clock setup_secondary_APIC_clock
#endif

static __inline fastcall void native_apic_write(unsigned long reg,
						unsigned long v)
{
	*((volatile unsigned long *)(APIC_BASE+reg)) = v;
}

static __inline fastcall void native_apic_write_atomic(unsigned long reg,
						       unsigned long v)
{
	xchg((volatile unsigned long *)(APIC_BASE+reg), v);
}

static __inline fastcall unsigned long native_apic_read(unsigned long reg)
{
	return *((volatile unsigned long *)(APIC_BASE+reg));
}

void apic_wait_icr_idle(void);
unsigned long safe_apic_wait_icr_idle(void);
int get_physical_broadcast(void);

#ifdef CONFIG_X86_GOOD_APIC
# define FORCE_READ_AROUND_WRITE 0
# define apic_read_around(x)
# define apic_write_around(x,y) apic_write((x),(y))
#else
# define FORCE_READ_AROUND_WRITE 1
# define apic_read_around(x) apic_read(x)
# define apic_write_around(x,y) apic_write_atomic((x),(y))
#endif

static inline void ack_APIC_irq(void)
{
	/*
	 * ack_APIC_irq() actually gets compiled as a single instruction:
	 * - a single rmw on Pentium/82489DX
	 * - a single write on P6+ cores (CONFIG_X86_GOOD_APIC)
	 * ... yummie.
	 */

	/* Docs say use 0 for future compatibility */
	apic_write_around(APIC_EOI, 0);
}

extern int lapic_get_maxlvt(void);
extern void clear_local_APIC(void);
extern void connect_bsp_APIC (void);
extern void disconnect_bsp_APIC (int virt_wire_setup);
extern void disable_local_APIC (void);
extern void lapic_shutdown (void);
extern int verify_local_APIC (void);
extern void cache_APIC_registers (void);
extern void sync_Arb_IDs (void);
extern void init_bsp_APIC (void);
extern void setup_local_APIC (void);
extern void init_apic_mappings (void);
extern void smp_local_timer_interrupt (void);
extern void setup_boot_APIC_clock (void);
extern void setup_secondary_APIC_clock (void);
extern int APIC_init_uniprocessor (void);

extern void enable_NMI_through_LVT0 (void * dummy);

#define ARCH_APICTIMER_STOPS_ON_C3	1

extern int timer_over_8254;
extern int local_apic_timer_c2_ok;

extern int local_apic_timer_disabled;

#else /* !CONFIG_X86_LOCAL_APIC */
static inline void lapic_shutdown(void) { }

#endif /* !CONFIG_X86_LOCAL_APIC */

#endif /* __ASM_APIC_H */