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authorYang Shi <shy828301@gmail.com>2021-10-28 14:36:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-10-28 17:18:55 -0700
commitc7cb42e94473aafe553c0f2a3d8ca904599399ed (patch)
tree2d740328a00a2e068f7c5e4a685b40a91e3cd371 /mm
parent8dcb3060d81dbfa8d954a2ec64ef7ca330f5bb4d (diff)
downloadlinux-c7cb42e94473aafe553c0f2a3d8ca904599399ed.tar.bz2
mm: hwpoison: remove the unnecessary THP check
When handling THP hwpoison checked if the THP is in allocation or free stage since hwpoison may mistreat it as hugetlb page. After commit 415c64c1453a ("mm/memory-failure: split thp earlier in memory error handling") the problem has been fixed, so this check is no longer needed. Remove it. The side effect of the removal is hwpoison may report unsplit THP instead of unknown error for shmem THP. It seems not like a big deal. The following patch "mm: filemap: check if THP has hwpoisoned subpage for PMD page fault" depends on this, which fixes shmem THP with hwpoisoned subpage(s) are mapped PMD wrongly. So this patch needs to be backported to -stable as well. Link: https://lkml.kernel.org/r/20211020210755.23964-2-shy828301@gmail.com Signed-off-by: Yang Shi <shy828301@gmail.com> Suggested-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: Hugh Dickins <hughd@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Peter Xu <peterx@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory-failure.c14
1 files changed, 0 insertions, 14 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 3e6449f2102a..73f68699e7ab 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1147,20 +1147,6 @@ static int __get_hwpoison_page(struct page *page)
if (!HWPoisonHandlable(head))
return -EBUSY;
- if (PageTransHuge(head)) {
- /*
- * Non anonymous thp exists only in allocation/free time. We
- * can't handle such a case correctly, so let's give it up.
- * This should be better than triggering BUG_ON when kernel
- * tries to touch the "partially handled" page.
- */
- if (!PageAnon(head)) {
- pr_err("Memory failure: %#lx: non anonymous thp\n",
- page_to_pfn(page));
- return 0;
- }
- }
-
if (get_page_unless_zero(head)) {
if (head == compound_head(page))
return 1;