Messages in this thread Patch in this message | | | Date | Fri, 08 May 2009 18:53:28 +0800 | From | Wu Fengguang <> | Subject | [PATCH 8/8] pagemap: export PG_hwpoison |
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This flag indicates a hardware detected memory corruption on the page. Any future access of the page data may bring down the machine.
CC: Andi Kleen <andi@firstfloor.org> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> --- Documentation/vm/page-types.c | 2 ++ Documentation/vm/pagemap.txt | 4 ++++ fs/proc/page.c | 5 +++++ 3 files changed, 11 insertions(+)
--- linux.orig/fs/proc/page.c +++ linux/fs/proc/page.c @@ -92,6 +92,7 @@ static const struct file_operations proc #define KPF_COMPOUND_TAIL 16 #define KPF_HUGE 17 #define KPF_UNEVICTABLE 18 +#define KPF_HWPOISON 19 #define KPF_NOPAGE 20 /* kernel hacking assistances @@ -171,6 +172,10 @@ static u64 get_uflags(struct page *page) u |= kpf_copy_bit(k, KPF_SWAPCACHE, PG_swapcache); u |= kpf_copy_bit(k, KPF_SWAPBACKED, PG_swapbacked); +#ifdef CONFIG_MEMORY_FAILURE + u |= kpf_copy_bit(k, KPF_HWPOISON, PG_hwpoison); +#endif + #ifdef CONFIG_UNEVICTABLE_LRU u |= kpf_copy_bit(k, KPF_UNEVICTABLE, PG_unevictable); u |= kpf_copy_bit(k, KPF_MLOCKED, PG_mlocked); --- linux.orig/Documentation/vm/page-types.c +++ linux/Documentation/vm/page-types.c @@ -47,6 +47,7 @@ #define KPF_COMPOUND_TAIL 16 #define KPF_HUGE 17 #define KPF_UNEVICTABLE 18 +#define KPF_HWPOISON 19 #define KPF_NOPAGE 20 /* [32-] kernel hacking assistances */ @@ -94,6 +95,7 @@ static char *page_flag_names[] = { [KPF_COMPOUND_TAIL] = "T:compound_tail", [KPF_HUGE] = "G:huge", [KPF_UNEVICTABLE] = "u:unevictable", + [KPF_HWPOISON] = "X:hwpoison", [KPF_NOPAGE] = "n:nopage", [KPF_RESERVED] = "r:reserved", --- linux.orig/Documentation/vm/pagemap.txt +++ linux/Documentation/vm/pagemap.txt @@ -57,6 +57,7 @@ There are three components to pagemap: 16. COMPOUND_TAIL 16. HUGE 18. UNEVICTABLE + 19. HWPOISON 20. NOPAGE Short descriptions to the page flags: @@ -86,6 +87,9 @@ Short descriptions to the page flags: 17. HUGE this is an integral part of a HugeTLB page +19. HWPOISON + hardware detected memory corruption on this page: don't touch the data! + 20. NOPAGE no page frame exists at the requested address --
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