Commit ef526b17 authored by Miaohe Lin's avatar Miaohe Lin Committed by akpm

mm/memory-failure.c: dissolve truncated hugetlb page

If me_huge_page meets a truncated but not yet freed hugepage, it won't be
dissolved even if we hold the last refcnt. It's because the hugepage has
NULL page_mapping while it's not anonymous hugepage too. Thus we lose the
last chance to dissolve it into buddy to save healthy subpages. Remove
PageAnon check to handle these hugepages too.

Link: https://lkml.kernel.org/r/20220414114941.11223-3-linmiaohe@huawei.comSigned-off-by: default avatarMiaohe Lin <linmiaohe@huawei.com>
Acked-by: default avatarNaoya Horiguchi <naoya.horiguchi@nec.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 3f871370
...@@ -1040,11 +1040,10 @@ static int me_huge_page(struct page_state *ps, struct page *p) ...@@ -1040,11 +1040,10 @@ static int me_huge_page(struct page_state *ps, struct page *p)
res = MF_FAILED; res = MF_FAILED;
unlock_page(hpage); unlock_page(hpage);
/* /*
* migration entry prevents later access on error anonymous * migration entry prevents later access on error hugepage,
* hugepage, so we can free and dissolve it into buddy to * so we can free and dissolve it into buddy to save healthy
* save healthy subpages. * subpages.
*/ */
if (PageAnon(hpage))
put_page(hpage); put_page(hpage);
if (__page_handle_poison(p)) { if (__page_handle_poison(p)) {
page_ref_inc(p); page_ref_inc(p);
......
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