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| author | Andi Kleen <andi@firstfloor.org> | 2009-09-16 11:50:03 +0200 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2009-09-16 11:50:03 +0200 |
| commit | d466f2fcb32cd97fd586bfa33f5dba3ac78aadb0 (patch) | |
| tree | 3e8d7f89f08e6b2340adebb4ebdbfb7329902607 | |
| parent | 0cb583fd2862f19ea88b02eb307d11c09e51e2f8 (diff) | |
| download | linux-d466f2fcb32cd97fd586bfa33f5dba3ac78aadb0.tar.gz | |
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: Christoph Lameter <cl@linux.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
| -rw-r--r-- | include/linux/page-flags.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 2b87acfc5f87..9bc5fd9fdbf6 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -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! */ /* @@ -102,6 +105,9 @@ enum pageflags { #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, /* Filesystems */ @@ -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. |