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Commit 253fb02d authored by Wu Fengguang's avatar Wu Fengguang Committed by Linus Torvalds
Browse files

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: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7823da36

Documentation/vm/page-types.c

+2 −0
Original line number Diff line number Diff line
@@ -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",

Documentation/vm/pagemap.txt

+4 −0
Original line number Diff line number Diff line
@@ -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

fs/proc/page.c

+5 −0
Original line number Diff line number Diff line
@@ -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