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    Subject[PATCH] [1/16] HWPOISON: Add page flag for poisoned pages
    Date

    Hardware poisoned pages need special handling in the VM and shouldn't be
    touched again. This requires a new page flag. Define it here.

    The page flags wars seem to be over, so it shouldn't be a problem
    to get a new one.

    v2: Add TestSetHWPoison (suggested by Johannes Weiner)

    Acked-by: Christoph Lameter <cl@linux.com>
    Signed-off-by: Andi Kleen <ak@linux.intel.com>

    ---
    include/linux/page-flags.h | 17 ++++++++++++++++-
    1 file changed, 16 insertions(+), 1 deletion(-)

    Index: linux/include/linux/page-flags.h
    ===================================================================
    --- linux.orig/include/linux/page-flags.h 2009-05-27 21:13:54.000000000 +0200
    +++ linux/include/linux/page-flags.h 2009-05-27 21:14:21.000000000 +0200
    @@ -51,6 +51,9 @@
    * PG_buddy is set to indicate that the page is free and in the buddy system
    * (see mm/page_alloc.c).
    *
    + * PG_hwpoison indicates that a page got corrupted in hardware and contains
    + * data with incorrect ECC bits that triggered a machine check. Accessing is
    + * not safe since it may cause another machine check. Don't touch!
    */

    /*
    @@ -104,6 +107,9 @@
    #ifdef CONFIG_IA64_UNCACHED_ALLOCATOR
    PG_uncached, /* Page has been mapped as uncached */
    #endif
    +#ifdef CONFIG_MEMORY_FAILURE
    + PG_hwpoison, /* hardware poisoned page. Don't touch */
    +#endif
    __NR_PAGEFLAGS,

    /* Filesystems */
    @@ -273,6 +279,15 @@
    PAGEFLAG_FALSE(Uncached)
    #endif

    +#ifdef CONFIG_MEMORY_FAILURE
    +PAGEFLAG(HWPoison, hwpoison)
    +TESTSETFLAG(HWPoison, hwpoison)
    +#define __PG_HWPOISON (1UL << PG_hwpoison)
    +#else
    +PAGEFLAG_FALSE(HWPoison)
    +#define __PG_HWPOISON 0
    +#endif
    +
    static inline int PageUptodate(struct page *page)
    {
    int ret = test_bit(PG_uptodate, &(page)->flags);
    @@ -403,7 +418,7 @@
    1 << PG_private | 1 << PG_private_2 | \
    1 << PG_buddy | 1 << PG_writeback | 1 << PG_reserved | \
    1 << PG_slab | 1 << PG_swapcache | 1 << PG_active | \
    - __PG_UNEVICTABLE | __PG_MLOCKED)
    + __PG_HWPOISON | __PG_UNEVICTABLE | __PG_MLOCKED)

    /*
    * Flags checked when a page is prepped for return by the page allocator.

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