The patch titled
Subject: Revert "mm: mempolicy: Let vma_merge and vma_split handle vma->vm_policy linkages"
has been added to the -mm tree. Its filename is
revert-mm-mempolicy-let-vma_merge-and-vma_split-handle-vma-vm_policy-linkages.patch
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------------------------------------------------------
From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx>
Subject: Revert "mm: mempolicy: Let vma_merge and vma_split handle vma->vm_policy linkages"
05f144a0 ("mm: mempolicy: Let vma_merge and vma_split handle
vma->vm_policy linkages") removed vma->vm_policy updates code but it is
the purpose of mbind_range(). Now, mbind_range() is virtually a no-op and
while it does not allow memory corruption it is not the right fix. This
patch is a revert.
[mgorman@xxxxxxx: Edited changelog]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 41 ++++++++++++++++++++++++-----------------
1 file changed, 24 insertions(+), 17 deletions(-)
diff -puN mm/mempolicy.c~revert-mm-mempolicy-let-vma_merge-and-vma_split-handle-vma-vm_policy-linkages mm/mempolicy.c
--- a/mm/mempolicy.c~revert-mm-mempolicy-let-vma_merge-and-vma_split-handle-vma-vm_policy-linkages
+++ a/mm/mempolicy.c
@@ -607,6 +607,27 @@ check_range(struct mm_struct *mm, unsign
return first;
}
+/* Apply policy to a single VMA */
+static int policy_vma(struct vm_area_struct *vma, struct mempolicy *new)
+{
+ int err = 0;
+ struct mempolicy *old = vma->vm_policy;
+
+ pr_debug("vma %lx-%lx/%lx vm_ops %p vm_file %p set_policy %p\n",
+ vma->vm_start, vma->vm_end, vma->vm_pgoff,
+ vma->vm_ops, vma->vm_file,
+ vma->vm_ops ? vma->vm_ops->set_policy : NULL);
+
+ if (vma->vm_ops && vma->vm_ops->set_policy)
+ err = vma->vm_ops->set_policy(vma, new);
+ if (!err) {
+ mpol_get(new);
+ vma->vm_policy = new;
+ mpol_put(old);
+ }
+ return err;
+}
+
/* Step 2: apply policy to a range and do splits. */
static int mbind_range(struct mm_struct *mm, unsigned long start,
unsigned long end, struct mempolicy *new_pol)
@@ -655,23 +676,9 @@ static int mbind_range(struct mm_struct
if (err)
goto out;
}
-
- /*
- * Apply policy to a single VMA. The reference counting of
- * policy for vma_policy linkages has already been handled by
- * vma_merge and split_vma as necessary. If this is a shared
- * policy then ->set_policy will increment the reference count
- * for an sp node.
- */
- pr_debug("vma %lx-%lx/%lx vm_ops %p vm_file %p set_policy %p\n",
- vma->vm_start, vma->vm_end, vma->vm_pgoff,
- vma->vm_ops, vma->vm_file,
- vma->vm_ops ? vma->vm_ops->set_policy : NULL);
- if (vma->vm_ops && vma->vm_ops->set_policy) {
- err = vma->vm_ops->set_policy(vma, new_pol);
- if (err)
- goto out;
- }
+ err = policy_vma(vma, new_pol);
+ if (err)
+ goto out;
}
out:
_
Patches currently in -mm which might be from kosaki.motohiro@xxxxxxxxx are
mm-fix-nonuniform-page-status-when-writing-new-file-with-small-buffer.patch
mm-fix-nonuniform-page-status-when-writing-new-file-with-small-buffer-fix.patch
mm-fix-nonuniform-page-status-when-writing-new-file-with-small-buffer-fix-fix.patch
revert-mm-mempolicy-let-vma_merge-and-vma_split-handle-vma-vm_policy-linkages.patch
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