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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.

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle
 * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
 */
#ifndef _ASM_IRQ_H
#define _ASM_IRQ_H

#include <linux/linkage.h>

#include <asm/mipsmtregs.h>

#include <irq.h>

#ifdef CONFIG_I8259
static inline int irq_canonicalize(int irq)
{
	return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq);
}
#else
#define irq_canonicalize(irq) (irq)	/* Sane hardware, sane code ... */
#endif

#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
/*
 * Clear interrupt mask handling "backstop" if irq_hwmask
 * entry so indicates. This implies that the ack() or end()
 * functions will take over re-enabling the low-level mask.
 * Otherwise it will be done on return from exception.
 */
#define __DO_IRQ_SMTC_HOOK(irq)						\
do {									\
	if (irq_hwmask[irq] & 0x0000ff00)				\
		write_c0_tccontext(read_c0_tccontext() &		\
		                   ~(irq_hwmask[irq] & 0x0000ff00));	\
} while (0)
#else
#define __DO_IRQ_SMTC_HOOK(irq) do { } while (0)
#endif

/*
 * do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 *
 * Ideally there should be away to get this into kernel/irq/handle.c to
 * avoid the overhead of a call for just a tiny function ...
 */
#define do_IRQ(irq)							\
do {									\
	irq_enter();							\
	__DO_IRQ_SMTC_HOOK(irq);					\
	generic_handle_irq(irq);					\
	irq_exit();							\
} while (0)

extern void arch_init_irq(void);
extern void spurious_interrupt(void);

#ifdef CONFIG_MIPS_MT_SMTC
struct irqaction;

extern unsigned long irq_hwmask[];
extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
                          unsigned long hwmask);
#endif /* CONFIG_MIPS_MT_SMTC */

extern int allocate_irqno(void);
extern void alloc_legacy_irqno(void);
extern void free_irqno(unsigned int irq);

/*
 * Before R2 the timer and performance counter interrupts were both fixed to
 * IE7.  Since R2 their number has to be read from the c0_intctl register.
 */
#define CP0_LEGACY_COMPARE_IRQ 7

extern int cp0_compare_irq;
extern int cp0_perfcount_irq;

#endif /* _ASM_IRQ_H */