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    SubjectRe: [PATCH] [1/16] HWPOISON: Add page flag for poisoned pages
    On Fri, 29 May 2009 23:35:26 +0200 (CEST)
    Andi Kleen <andi@firstfloor.org> wrote:

    >
    > 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 2009-05-29 23:32:10.000000000 +0200
    > +++ linux/include/linux/page-flags.h 2009-05-29 23:32:10.000000000 +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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    --
    --
    "Alan, I'm getting a bit worried about you."
    -- Linus Torvalds


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