Commit d466f2fc authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
Browse files

HWPOISON: Add page flag for poisoned pages 



Hardware poisoned pages need special handling in the VM and shouldn't be
touched again. This requires a new page flag. Define it here.

The page flags wars seem to be over, so it shouldn't be a problem
to get a new one.

v2: Add TestSetHWPoison (suggested by Johannes Weiner)

Acked-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent 0cb583fd

include/linux/page-flags.h

+16 −1
Original line number Diff line number Diff line
@@ -51,6 +51,9 @@ 
 * PG_buddy is set to indicate that the page is free and in the buddy system

 * (see mm/page_alloc.c).

 *

 * PG_hwpoison indicates that a page got corrupted in hardware and contains

 * data with incorrect ECC bits that triggered a machine check. Accessing is

 * not safe since it may cause another machine check. Don't touch!

 */



/*
@@ -101,6 +104,9 @@ enum pageflags { 
#endif

#ifdef CONFIG_ARCH_USES_PG_UNCACHED

	PG_uncached,		/* Page has been mapped as uncached */

#endif

#ifdef CONFIG_MEMORY_FAILURE

	PG_hwpoison,		/* hardware poisoned page. Don't touch */

#endif

	__NR_PAGEFLAGS,
@@ -263,6 +269,15 @@ PAGEFLAG(Uncached, uncached) 
PAGEFLAG_FALSE(Uncached)

#endif



#ifdef CONFIG_MEMORY_FAILURE

PAGEFLAG(HWPoison, hwpoison)

TESTSETFLAG(HWPoison, hwpoison)

#define __PG_HWPOISON (1UL << PG_hwpoison)

#else

PAGEFLAG_FALSE(HWPoison)

#define __PG_HWPOISON 0

#endif



static inline int PageUptodate(struct page *page)

{

	int ret = test_bit(PG_uptodate, &(page)->flags);
@@ -387,7 +402,7 @@ static inline void __ClearPageTail(struct page *page) 
	 1 << PG_private | 1 << PG_private_2 | \

	 1 << PG_buddy	 | 1 << PG_writeback | 1 << PG_reserved | \

	 1 << PG_slab	 | 1 << PG_swapcache | 1 << PG_active | \

	 1 << PG_unevictable | __PG_MLOCKED)

	 1 << PG_unevictable | __PG_MLOCKED | __PG_HWPOISON)



/*

 * Flags checked when a page is prepped for return by the page allocator.

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