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>

diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
index fa1a30d..87f5722 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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