From 253fb02d62571e5455eedc9e39b9d660e86a40f0 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Wed, 7 Oct 2009 16:32:27 -0700 Subject: [PATCH] pagemap: export KPF_HWPOISON This flag indicates a hardware detected memory corruption on the page. Any future access of the page data may bring down the machine. Signed-off-by: Wu Fengguang Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/vm/page-types.c | 2 ++ Documentation/vm/pagemap.txt | 4 ++++ fs/proc/page.c | 5 +++++ 3 files changed, 11 insertions(+) diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c index fa1a30d..87f5722 100644 --- a/Documentation/vm/page-types.c +++ b/Documentation/vm/page-types.c @@ -69,6 +69,7 @@ #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 */ @@ -116,6 +117,7 @@ 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", diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt index 600a304..2fdd84a 100644 --- a/Documentation/vm/pagemap.txt +++ b/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 diff --git a/fs/proc/page.c b/fs/proc/page.c index 2281c2c..5033ce0 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -94,6 +94,7 @@ static const struct file_operations proc_kpagecount_operations = { #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 -- 1.8.2.3