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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2015-04-11 22:27:19 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-11 22:27:19 -0400 |
| commit | 39c853ebfe169f187a760b34f9cbf54751bfce00 (patch) | |
| tree | 2a5a741d0cff7d4f90998b31b32ff80cfccd0369 /mm/mprotect.c | |
| parent | sg_start_req(): use import_iovec() (diff) | |
| parent | new helper: msg_data_left() (diff) | |
| download | linux-dev-39c853ebfe169f187a760b34f9cbf54751bfce00.tar.xz linux-dev-39c853ebfe169f187a760b34f9cbf54751bfce00.zip | |
Merge branch 'for-davem' into for-next
Diffstat (limited to 'mm/mprotect.c')
| -rw-r--r-- | mm/mprotect.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index 44727811bf4c..88584838e704 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -75,6 +75,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, oldpte = *pte; if (pte_present(oldpte)) { pte_t ptent; + bool preserve_write = prot_numa && pte_write(oldpte); /* * Avoid trapping faults against the zero or KSM @@ -94,6 +95,8 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, ptent = ptep_modify_prot_start(mm, addr, pte); ptent = pte_modify(ptent, newprot); + if (preserve_write) + ptent = pte_mkwrite(ptent); /* Avoid taking write faults for known dirty pages */ if (dirty_accountable && pte_dirty(ptent) && |