[PATCHv9-rebased2 17/37] thp: prepare change_huge_pmd() for file thp
From: Kirill A. Shutemov <hidden>
Date: 2016-06-15 20:07:09
Also in:
linux-fsdevel, lkml
Subsystem:
memory management, memory management - thp (transparent huge page), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Linus Torvalds
change_huge_pmd() has assert which is not relvant for file page. For shared mapping it's perfectly fine to have page table entry writable, without explicit mkwrite. Signed-off-by: Kirill A. Shutemov <redacted> --- mm/huge_memory.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 8866f87bd011..0bc92cb18f0e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c@@ -1792,7 +1792,8 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, entry = pmd_mkwrite(entry); ret = HPAGE_PMD_NR; set_pmd_at(mm, addr, pmd, entry); - BUG_ON(!preserve_write && pmd_write(entry)); + BUG_ON(vma_is_anonymous(vma) && !preserve_write && + pmd_write(entry)); } spin_unlock(ptl); }
--
2.8.1
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