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 Signed-off-by: Wu Fengguang --- Documentation/vm/pagemap.txt | 4 ++++ fs/proc/page.c | 5 +++++ tools/vm/page-types.c | 2 ++ 3 files changed, 11 insertions(+) --- linux-mm.orig/fs/proc/page.c 2009-08-31 13:58:19.000000000 +0800 +++ linux-mm/fs/proc/page.c 2009-08-31 14:59:08.000000000 +0800 @@ -94,6 +94,7 @@ 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 #define KPF_KSM 21 @@ -180,6 +181,10 @@ static u64 get_uflags(struct page *page) u |= kpf_copy_bit(k, KPF_UNEVICTABLE, PG_unevictable); u |= kpf_copy_bit(k, KPF_MLOCKED, PG_mlocked); +#ifdef CONFIG_MEMORY_FAILURE + u |= kpf_copy_bit(k, KPF_HWPOISON, PG_hwpoison); +#endif + #ifdef CONFIG_IA64_UNCACHED_ALLOCATOR u |= kpf_copy_bit(k, KPF_UNCACHED, PG_uncached); #endif --- linux-mm.orig/tools/vm/page-types.c 2009-08-31 13:58:19.000000000 +0800 +++ linux-mm/tools/vm/page-types.c 2009-08-31 14:59:08.000000000 +0800 @@ -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-mm.orig/Documentation/vm/pagemap.txt 2009-08-31 13:58:19.000000000 +0800 +++ linux-mm/Documentation/vm/pagemap.txt 2009-08-31 14:59:08.000000000 +0800 @@ -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 -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/