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authorZi Yan <ziy@nvidia.com>2022-04-08 13:08:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-04-08 14:20:36 -1000
commita04cd1600b831a16625b45226b90a292c8f6e8d9 (patch)
tree28363aaa3389bd3625ff61f32f58ad5a748a84e8
parentd00c50b35101b862c3db270ffeba53a63a1063d9 (diff)
mm: migrate: use thp_order instead of HPAGE_PMD_ORDER for new page allocation.
Fix a VM_BUG_ON_FOLIO(folio_nr_pages(old) != nr_pages) crash. With folios support, it is possible to have other than HPAGE_PMD_ORDER THPs, in the form of folios, in the system. Use thp_order() to correctly determine the source page order during migration. Link: https://lkml.kernel.org/r/20220404165325.1883267-1-zi.yan@sent.com Link: https://lore.kernel.org/linux-mm/20220404132908.GA785673@u2004/ Fixes: d68eccad3706 ("mm/filemap: Allow large folios to be added to the page cache") Reported-by: Naoya Horiguchi <naoya.horiguchi@linux.dev> Signed-off-by: Zi Yan <ziy@nvidia.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mempolicy.c2
-rw-r--r--mm/migrate.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a2516d31db6c..358b7c11426d 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1209,7 +1209,7 @@ static struct page *new_page(struct page *page, unsigned long start)
struct page *thp;
thp = alloc_hugepage_vma(GFP_TRANSHUGE, vma, address,
- HPAGE_PMD_ORDER);
+ thp_order(page));
if (!thp)
return NULL;
prep_transhuge_page(thp);
diff --git a/mm/migrate.c b/mm/migrate.c
index de175e2fdba5..79e4b36f709a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1547,7 +1547,7 @@ struct page *alloc_migration_target(struct page *page, unsigned long private)
*/
gfp_mask &= ~__GFP_RECLAIM;
gfp_mask |= GFP_TRANSHUGE;
- order = HPAGE_PMD_ORDER;
+ order = thp_order(page);
}
zidx = zone_idx(page_zone(page));
if (is_highmem_idx(zidx) || zidx == ZONE_MOVABLE)