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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-07-26 15:25:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commitb237aded41cd68f378650209e8a10c04a25da258 (patch)
treec34746bdbf89173310c216661ba32cf90f91bfc3 /mm/huge_memory.c
parent628d47ce98d50860d4fc1eef250126dd50622a89 (diff)
thp: prepare change_huge_pmd() for file thp
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. Link: http://lkml.kernel.org/r/1466021202-61880-18-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index c11cfce4d9d9..3a20f11248a1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1788,7 +1788,8 @@ 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);
}