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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-16 06:05:26 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 21:11:15 +0300 |
| commit | d01ac3c35214ce362f50cada37cb7bab8c801896 (patch) | |
| tree | 6cbc29351244c389a31304d9e503b1360c5aa130 /mm | |
| parent | 887b22c628c615811be3b877e02c9c1fe9d85d6d (diff) | |
| download | linux-d01ac3c35214ce362f50cada37cb7bab8c801896.tar.xz | |
mm/memory: remove page fault assumption of compound page size
A compound page in the page cache will not necessarily be of PMD size,
so check explicitly.
[willy@infradead.org: fix remove page fault assumption of compound page size]
Link: https://lkml.kernel.org/r/20201001152259.14932-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-3-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/memory.c b/mm/memory.c index 2afb01ea1307..589afe45d0b3 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3709,13 +3709,14 @@ static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page) unsigned long haddr = vmf->address & HPAGE_PMD_MASK; pmd_t entry; int i; - vm_fault_t ret; + vm_fault_t ret = VM_FAULT_FALLBACK; if (!transhuge_vma_suitable(vma, haddr)) - return VM_FAULT_FALLBACK; + return ret; - ret = VM_FAULT_FALLBACK; page = compound_head(page); + if (compound_order(page) != HPAGE_PMD_ORDER) + return ret; /* * Archs like ppc64 need additonal space to store information |