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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_MCE_H
#define _ASM_MCE_H 1

#include <asm/ioctls.h>
#include <asm/types.h>

/* 
 * Machine Check support for x86
 */

#define MCG_CTL_P        (1UL<<8)   /* MCG_CAP register available */

#define MCG_STATUS_RIPV  (1UL<<0)   /* restart ip valid */
#define MCG_STATUS_EIPV  (1UL<<1)   /* eip points to correct instruction */
#define MCG_STATUS_MCIP  (1UL<<2)   /* machine check in progress */

#define MCI_STATUS_VAL   (1UL<<63)  /* valid error */
#define MCI_STATUS_OVER  (1UL<<62)  /* previous errors lost */
#define MCI_STATUS_UC    (1UL<<61)  /* uncorrected error */
#define MCI_STATUS_EN    (1UL<<60)  /* error enabled */
#define MCI_STATUS_MISCV (1UL<<59)  /* misc error reg. valid */
#define MCI_STATUS_ADDRV (1UL<<58)  /* addr reg. valid */
#define MCI_STATUS_PCC   (1UL<<57)  /* processor context corrupt */

/* Fields are zero when not available */
struct mce {
	__u64 status;
	__u64 misc;
	__u64 addr;
	__u64 mcgstatus;
	__u64 rip;	
	__u64 tsc;	/* cpu time stamp counter */
	__u64 res1;	/* for future extension */	
	__u64 res2;	/* dito. */
	__u8  cs;		/* code segment */
	__u8  bank;	/* machine check bank */
	__u8  cpu;	/* cpu that raised the error */
	__u8  finished;   /* entry is valid */
	__u32 pad;   
};

/* 
 * This structure contains all data related to the MCE log.
 * Also carries a signature to make it easier to find from external debugging tools.
 * Each entry is only valid when its finished flag is set.
 */

#define MCE_LOG_LEN 32

struct mce_log { 
	char signature[12]; /* "MACHINECHECK" */ 
	unsigned len;  	    /* = MCE_LOG_LEN */ 
	unsigned next;
	unsigned flags;
	unsigned pad0; 
	struct mce entry[MCE_LOG_LEN];
};

#define MCE_OVERFLOW 0		/* bit 0 in flags means overflow */

#define MCE_LOG_SIGNATURE 	"MACHINECHECK"

#define MCE_GET_RECORD_LEN   _IOR('M', 1, int)
#define MCE_GET_LOG_LEN      _IOR('M', 2, int)
#define MCE_GETCLEAR_FLAGS   _IOR('M', 3, int)

/* Software defined banks */
#define MCE_EXTENDED_BANK	128
#define MCE_THERMAL_BANK	MCE_EXTENDED_BANK + 0

#define K8_MCE_THRESHOLD_BASE      (MCE_EXTENDED_BANK + 1)      /* MCE_AMD */
#define K8_MCE_THRESHOLD_BANK_0    (MCE_THRESHOLD_BASE + 0 * 9)
#define K8_MCE_THRESHOLD_BANK_1    (MCE_THRESHOLD_BASE + 1 * 9)
#define K8_MCE_THRESHOLD_BANK_2    (MCE_THRESHOLD_BASE + 2 * 9)
#define K8_MCE_THRESHOLD_BANK_3    (MCE_THRESHOLD_BASE + 3 * 9)
#define K8_MCE_THRESHOLD_BANK_4    (MCE_THRESHOLD_BASE + 4 * 9)
#define K8_MCE_THRESHOLD_BANK_5    (MCE_THRESHOLD_BASE + 5 * 9)
#define K8_MCE_THRESHOLD_DRAM_ECC  (MCE_THRESHOLD_BANK_4 + 0)

#ifdef __KERNEL__
#include <asm/atomic.h>

void mce_log(struct mce *m);
DECLARE_PER_CPU(struct sys_device, device_mce);

#ifdef CONFIG_X86_MCE_INTEL
void mce_intel_feature_init(struct cpuinfo_x86 *c);
#else
static inline void mce_intel_feature_init(struct cpuinfo_x86 *c)
{
}
#endif

#ifdef CONFIG_X86_MCE_AMD
void mce_amd_feature_init(struct cpuinfo_x86 *c);
#else
static inline void mce_amd_feature_init(struct cpuinfo_x86 *c)
{
}
#endif

void mce_log_therm_throt_event(unsigned int cpu, __u64 status);

extern atomic_t mce_entry;

extern void do_machine_check(struct pt_regs *, long);

extern int mce_notify_user(void);

extern void stop_mce(void);
extern void restart_mce(void);

#endif

#endif