The patch titled
add-page_mkwrite-vm_operations-method fix
has been added to the -mm tree. Its filename is
add-page_mkwrite-vm_operations-method-fix.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: add-page_mkwrite-vm_operations-method fix
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
get_user_pages(.write=1, .force=1) can generate COW hits on read-only
shared mappings, this patch traps those as mkpage_write candidates and
fails to handle them the old way.
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Joel Becker <Joel.Becker@xxxxxxxxxx>
Cc: Mark Fasheh <mark.fasheh@xxxxxxxxxx>
Cc: Anton Altaparmakov <aia21@xxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/memory.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/memory.c~add-page_mkwrite-vm_operations-method-fix mm/memory.c
--- a/mm/memory.c~add-page_mkwrite-vm_operations-method-fix
+++ a/mm/memory.c
@@ -1463,7 +1463,8 @@ static int do_wp_page(struct mm_struct *
if (!old_page)
goto gotten;
- if (unlikely(vma->vm_flags & VM_SHARED)) {
+ if (unlikely((vma->vm_flags & (VM_SHARED|VM_WRITE)) ==
+ (VM_SHARED|VM_WRITE))) {
if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
/*
* Notify the address space that the page is about to
_
Patches currently in -mm which might be from a.p.zijlstra@xxxxxxxxx are
buglet-in-radix_tree_tag_set.patch
add-page_mkwrite-vm_operations-method-fix.patch
-
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