diff options
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 41c634f45d45..a96364be8ab4 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -954,7 +954,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn, enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS; struct address_space *mapping; LIST_HEAD(tokill); - bool unmap_success; + bool unmap_success = true; int kill = 1, forcekill; struct page *hpage = *hpagep; bool mlocked = PageMlocked(hpage); @@ -1016,7 +1016,32 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn, if (kill) collect_procs(hpage, &tokill, flags & MF_ACTION_REQUIRED); - unmap_success = try_to_unmap(hpage, ttu); + if (!PageHuge(hpage)) { + unmap_success = try_to_unmap(hpage, ttu); + } else { + /* + * For hugetlb pages, try_to_unmap could potentially call + * huge_pmd_unshare. Because of this, take semaphore in + * write mode here and set TTU_RMAP_LOCKED to indicate we + * have taken the lock at this higer level. + * + * Note that the call to hugetlb_page_mapping_lock_write + * is necessary even if mapping is already set. It handles + * ugliness of potentially having to drop page lock to obtain + * i_mmap_rwsem. + */ + mapping = hugetlb_page_mapping_lock_write(hpage); + + if (mapping) { + unmap_success = try_to_unmap(hpage, + ttu|TTU_RMAP_LOCKED); + i_mmap_unlock_write(mapping); + } else { + pr_info("Memory failure: %#lx: could not find mapping for mapped huge page\n", + pfn); + unmap_success = false; + } + } if (!unmap_success) pr_err("Memory failure: %#lx: failed to unmap page (mapcount=%d)\n", pfn, page_mapcount(hpage)); @@ -1785,7 +1810,7 @@ static int __soft_offline_page(struct page *page, int flags) */ if (!__PageMovable(page)) inc_node_page_state(page, NR_ISOLATED_ANON + - page_is_file_cache(page)); + page_is_file_lru(page)); list_add(&page->lru, &pagelist); ret = migrate_pages(&pagelist, new_page, NULL, MPOL_MF_MOVE_ALL, MIGRATE_SYNC, MR_MEMORY_FAILURE); |