Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [1/16] HWPOISON: Add page flag for poisoned pages | Date | Wed, 27 May 2009 22:12:26 +0200 (CEST) |
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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: Christoph Lameter <cl@linux.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
--- include/linux/page-flags.h | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)
Index: linux/include/linux/page-flags.h =================================================================== --- linux.orig/include/linux/page-flags.h 2009-05-27 21:13:54.000000000 +0200 +++ linux/include/linux/page-flags.h 2009-05-27 21:14:21.000000000 +0200 @@ -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! */ /* @@ -104,6 +107,9 @@ #ifdef CONFIG_IA64_UNCACHED_ALLOCATOR PG_uncached, /* Page has been mapped as uncached */ #endif +#ifdef CONFIG_MEMORY_FAILURE + PG_hwpoison, /* hardware poisoned page. Don't touch */ +#endif __NR_PAGEFLAGS, /* Filesystems */ @@ -273,6 +279,15 @@ 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); @@ -403,7 +418,7 @@ 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 | \ - __PG_UNEVICTABLE | __PG_MLOCKED) + __PG_HWPOISON | __PG_UNEVICTABLE | __PG_MLOCKED) /* * Flags checked when a page is prepped for return by the page allocator.
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