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-rw-r--r--mm/mempolicy.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index adc395481813..c3fdbcb17658 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -636,6 +636,7 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
struct vm_area_struct *prev;
struct vm_area_struct *vma;
int err = 0;
+ pgoff_t pgoff;
unsigned long vmstart;
unsigned long vmend;
@@ -643,13 +644,21 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
if (!vma || vma->vm_start > start)
return -EFAULT;
+ if (start > vma->vm_start)
+ prev = vma;
+
for (; vma && vma->vm_start < end; prev = vma, vma = next) {
next = vma->vm_next;
vmstart = max(start, vma->vm_start);
vmend = min(end, vma->vm_end);
+ if (mpol_equal(vma_policy(vma), new_pol))
+ continue;
+
+ pgoff = vma->vm_pgoff +
+ ((vmstart - vma->vm_start) >> PAGE_SHIFT);
prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags,
- vma->anon_vma, vma->vm_file, vma->vm_pgoff,
+ vma->anon_vma, vma->vm_file, pgoff,
new_pol);
if (prev) {
vma = prev;