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Diffstat (limited to 'mm/mprotect.c')
-rw-r--r--mm/mprotect.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index ef5be8eaab00..8eb7bb40dc40 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -149,7 +149,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
unsigned long this_pages;
next = pmd_addr_end(addr, end);
- if (!pmd_trans_huge(*pmd) && pmd_none_or_clear_bad(pmd))
+ if (!pmd_trans_huge(*pmd) && !pmd_devmap(*pmd)
+ && pmd_none_or_clear_bad(pmd))
continue;
/* invoke the mmu notifier if the pmd is populated */
@@ -158,9 +159,9 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
mmu_notifier_invalidate_range_start(mm, mni_start, end);
}
- if (pmd_trans_huge(*pmd)) {
+ if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) {
if (next - addr != HPAGE_PMD_SIZE)
- split_huge_page_pmd(vma, addr, pmd);
+ split_huge_pmd(vma, pmd, addr);
else {
int nr_ptes = change_huge_pmd(vma, pmd, addr,
newprot, prot_numa);
@@ -278,6 +279,10 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
* even if read-only so there is no need to account for them here
*/
if (newflags & VM_WRITE) {
+ /* Check space limits when area turns into data. */
+ if (!may_expand_vm(mm, newflags, nrpages) &&
+ may_expand_vm(mm, oldflags, nrpages))
+ return -ENOMEM;
if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_HUGETLB|
VM_SHARED|VM_NORESERVE))) {
charged = nrpages;
@@ -334,8 +339,8 @@ success:
populate_vma_page_range(vma, start, end, NULL);
}
- vm_stat_account(mm, oldflags, vma->vm_file, -nrpages);
- vm_stat_account(mm, newflags, vma->vm_file, nrpages);
+ vm_stat_account(mm, oldflags, -nrpages);
+ vm_stat_account(mm, newflags, nrpages);
perf_event_mmap(vma);
return 0;