diff options
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index dacc64183874..8aeba5341ccd 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -589,7 +589,6 @@ static struct page_state { { lru|dirty, lru|dirty, "LRU", me_pagecache_dirty }, { lru|dirty, lru, "clean LRU", me_pagecache_clean }, - { swapbacked, swapbacked, "anonymous", me_pagecache_clean }, /* * Catchall entry: must be at end. @@ -638,7 +637,7 @@ static int page_action(struct page_state *ps, struct page *p, * Do all that is necessary to remove user space mappings. Unmap * the pages and send SIGBUS to the processes if the data was dirty. */ -static void hwpoison_user_mappings(struct page *p, unsigned long pfn, +static int hwpoison_user_mappings(struct page *p, unsigned long pfn, int trapno) { enum ttu_flags ttu = TTU_UNMAP | TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS; @@ -648,15 +647,18 @@ static void hwpoison_user_mappings(struct page *p, unsigned long pfn, int i; int kill = 1; - if (PageReserved(p) || PageCompound(p) || PageSlab(p) || PageKsm(p)) - return; + if (PageReserved(p) || PageSlab(p)) + return SWAP_SUCCESS; /* * This check implies we don't kill processes if their pages * are in the swap cache early. Those are always late kills. */ if (!page_mapped(p)) - return; + return SWAP_SUCCESS; + + if (PageCompound(p) || PageKsm(p)) + return SWAP_FAIL; if (PageSwapCache(p)) { printk(KERN_ERR @@ -718,6 +720,8 @@ static void hwpoison_user_mappings(struct page *p, unsigned long pfn, */ kill_procs_ao(&tokill, !!PageDirty(p), trapno, ret != SWAP_SUCCESS, pfn); + + return ret; } int __memory_failure(unsigned long pfn, int trapno, int ref) @@ -787,8 +791,13 @@ int __memory_failure(unsigned long pfn, int trapno, int ref) /* * Now take care of user space mappings. + * Abort on fail: __remove_from_page_cache() assumes unmapped page. */ - hwpoison_user_mappings(p, pfn, trapno); + if (hwpoison_user_mappings(p, pfn, trapno) != SWAP_SUCCESS) { + printk(KERN_ERR "MCE %#lx: cannot unmap page, give up\n", pfn); + res = -EBUSY; + goto out; + } /* * Torn down by someone else? |