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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.

#include <linux/linkage.h>
#include <linux/sched.h>

#include <asm/pmon.h>
#include <asm/titan_dep.h>
#include <asm/time.h>

#define LAUNCHSTACK_SIZE 256

static __initdata DEFINE_SPINLOCK(launch_lock);

static unsigned long secondary_sp __initdata;
static unsigned long secondary_gp __initdata;

static unsigned char launchstack[LAUNCHSTACK_SIZE] __initdata
	__attribute__((aligned(2 * sizeof(long))));

static void __init prom_smp_bootstrap(void)
{
	local_irq_disable();

	while (spin_is_locked(&launch_lock));

	__asm__ __volatile__(
	"	move	$sp, %0		\n"
	"	move	$gp, %1		\n"
	"	j	smp_bootstrap	\n"
	:
	: "r" (secondary_sp), "r" (secondary_gp));
}

/*
 * PMON is a fragile beast.  It'll blow up once the mappings it's littering
 * right into the middle of KSEG3 are blown away so we have to grab the slave
 * core early and keep it in a waiting loop.
 */
void __init prom_grab_secondary(void)
{
	spin_lock(&launch_lock);

	pmon_cpustart(1, &prom_smp_bootstrap,
	              launchstack + LAUNCHSTACK_SIZE, 0);
}

/*
 * Detect available CPUs, populate phys_cpu_present_map before smp_init
 *
 * We don't want to start the secondary CPU yet nor do we have a nice probing
 * feature in PMON so we just assume presence of the secondary core.
 */
void __init plat_smp_setup(void)
{
	int i;

	cpus_clear(phys_cpu_present_map);

	for (i = 0; i < 2; i++) {
		cpu_set(i, phys_cpu_present_map);
		__cpu_number_map[i]	= i;
		__cpu_logical_map[i]	= i;
	}
}

void __init plat_prepare_cpus(unsigned int max_cpus)
{
	/*
	 * Be paranoid.  Enable the IPI only if we're really about to go SMP.
	 */
	if (cpus_weight(cpu_possible_map))
		set_c0_status(STATUSF_IP5);
}

/*
 * Firmware CPU startup hook
 * Complicated by PMON's weird interface which tries to minimic the UNIX fork.
 * It launches the next * available CPU and copies some information on the
 * stack so the first thing we do is throw away that stuff and load useful
 * values into the registers ...
 */
void __cpuinit prom_boot_secondary(int cpu, struct task_struct *idle)
{
	unsigned long gp = (unsigned long) task_thread_info(idle);
	unsigned long sp = __KSTK_TOS(idle);

	secondary_sp = sp;
	secondary_gp = gp;

	spin_unlock(&launch_lock);
}

/* Hook for after all CPUs are online */
void prom_cpus_done(void)
{
}

/*
 *  After we've done initial boot, this function is called to allow the
 *  board code to clean up state, if needed
 */
void __cpuinit prom_init_secondary(void)
{
	set_c0_status(ST0_CO | ST0_IE | ST0_IM);
}

void __cpuinit prom_smp_finish(void)
{
}

void titan_mailbox_irq(void)
{
	int cpu = smp_processor_id();
	unsigned long status;

	switch (cpu) {
	case 0:
		status = OCD_READ(RM9000x2_OCD_INTP0STATUS3);
		OCD_WRITE(RM9000x2_OCD_INTP0CLEAR3, status);

		if (status & 0x2)
			smp_call_function_interrupt();
		break;

	case 1:
		status = OCD_READ(RM9000x2_OCD_INTP1STATUS3);
		OCD_WRITE(RM9000x2_OCD_INTP1CLEAR3, status);

		if (status & 0x2)
			smp_call_function_interrupt();
		break;
	}
}

/*
 * Send inter-processor interrupt
 */
void core_send_ipi(int cpu, unsigned int action)
{
	/*
	 * Generate an INTMSG so that it can be sent over to the
	 * destination CPU. The INTMSG will put the STATUS bits
	 * based on the action desired. An alternative strategy
	 * is to write to the Interrupt Set register, read the
	 * Interrupt Status register and clear the Interrupt
	 * Clear register. The latter is preffered.
	 */
	switch (action) {
	case SMP_RESCHEDULE_YOURSELF:
		if (cpu == 1)
			OCD_WRITE(RM9000x2_OCD_INTP1SET3, 4);
		else
			OCD_WRITE(RM9000x2_OCD_INTP0SET3, 4);
		break;

	case SMP_CALL_FUNCTION:
		if (cpu == 1)
			OCD_WRITE(RM9000x2_OCD_INTP1SET3, 2);
		else
			OCD_WRITE(RM9000x2_OCD_INTP0SET3, 2);
		break;
	}
}