5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Liu Shixin liushixin2@huawei.com
When backport commit c79c5a0a00a9 to 5.4-stable, there is a mistake change. The head page instead of tail page should be passed to try_to_unmap(), otherwise unmap will failed as follows.
Memory failure: 0x121c10: failed to unmap page (mapcount=1) Memory failure: 0x121c10: recovery action for unmapping failed page: Ignored
Fixes: 85015a96bc24 ("mm/memory-failure: check the mapcount of the precise page") Signed-off-by: Liu Shixin liushixin2@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/memory-failure.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1030,7 +1030,7 @@ static bool hwpoison_user_mappings(struc if (kill) collect_procs(hpage, &tokill, flags & MF_ACTION_REQUIRED);
- unmap_success = try_to_unmap(p, ttu); + unmap_success = try_to_unmap(hpage, ttu); if (!unmap_success) pr_err("Memory failure: %#lx: failed to unmap page (mapcount=%d)\n", pfn, page_mapcount(p));