diff --git a/mm/memory-failure.c b/mm/memory-failure.c index dd110d3c82db891d3b664dd7f1eea8d07319bbb7..11ae0dacaae70ebf9c4dd84d08e0c2cc43ebb94a 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1345,7 +1345,6 @@ int memory_failure(unsigned long pfn, int flags) { struct page *p; struct page *hpage; - struct page *orig_head; struct dev_pagemap *pgmap; int res = 0; unsigned long page_flags; @@ -1383,7 +1382,7 @@ int memory_failure(unsigned long pfn, int flags) goto unlock_mutex; } - orig_head = hpage = compound_head(p); + hpage = compound_head(p); num_poisoned_pages_inc(); /* @@ -1443,10 +1442,21 @@ int memory_failure(unsigned long pfn, int flags) lock_page(p); /* - * The page could have changed compound pages during the locking. - * If this happens just bail out. + * We're only intended to deal with the non-Compound page here. + * However, the page could have changed compound pages due to + * race window. If this happens, we could try again to hopefully + * handle the page next round. */ - if (PageCompound(p) && compound_head(p) != orig_head) { + if (PageCompound(p)) { + if (retry) { + if (TestClearPageHWPoison(p)) + num_poisoned_pages_dec(); + unlock_page(p); + put_page(p); + flags &= ~MF_COUNT_INCREASED; + retry = false; + goto try_again; + } action_result(pfn, MF_MSG_DIFFERENT_COMPOUND, MF_IGNORED); res = -EBUSY; goto unlock_page;