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    Subject[PATCH] [2/16] HWPOISON: Export poison flag in /proc/kpageflags
    Date

    From: Fengguang Wu <fengguang.wu@intel.com>

    Export the new poison flag in /proc/kpageflags. Poisoned pages are moderately
    interesting even for administrators, so export them here. Also useful
    for debugging.

    AK: I extracted this out of a larger patch from Fengguang Wu.

    Signed-off-by: Andi Kleen <ak@linux.intel.com>

    ---
    fs/proc/page.c | 4 ++++
    1 file changed, 4 insertions(+)

    Index: linux/fs/proc/page.c
    ===================================================================
    --- linux.orig/fs/proc/page.c 2009-05-29 23:32:10.000000000 +0200
    +++ linux/fs/proc/page.c 2009-05-29 23:32:10.000000000 +0200
    @@ -79,6 +79,7 @@
    #define KPF_WRITEBACK 8
    #define KPF_RECLAIM 9
    #define KPF_BUDDY 10
    +#define KPF_HWPOISON 11

    #define kpf_copy_bit(flags, dstpos, srcpos) (((flags >> srcpos) & 1) << dstpos)

    @@ -118,6 +119,9 @@
    kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
    kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
    kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
    +#ifdef CONFIG_MEMORY_FAILURE
    + uflags |= kpf_copy_bit(kflags, KPF_HWPOISON, PG_hwpoison);
    +#endif

    if (put_user(uflags, out++)) {
    ret = -EFAULT;

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