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authorWu Fengguang <fengguang.wu@intel.com>2009-10-07 16:32:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-08 07:36:39 -0700
commit253fb02d62571e5455eedc9e39b9d660e86a40f0 (patch)
treef52fc8f0d792148d43e4e38ed48dc3666ef50b75
parent7823da36ce8e42d66941887eb922768d259763f2 (diff)
downloadop-kernel-dev-253fb02d62571e5455eedc9e39b9d660e86a40f0.zip
op-kernel-dev-253fb02d62571e5455eedc9e39b9d660e86a40f0.tar.gz
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 <fengguang.wu@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/vm/page-types.c2
-rw-r--r--Documentation/vm/pagemap.txt4
-rw-r--r--fs/proc/page.c5
3 files changed, 11 insertions, 0 deletions
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
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