From: Hugh Dickins <hugh@veritas.com>
rmap's try_to_unmap_one comments on find_vma failure, that a page may
temporarily be absent from a vma during mremap: no longer, though it is still
possible for this find_vma to fail, while unmap_vmas drops page_table_lock
(but that is no problem for file truncation).
---
25-akpm/mm/rmap.c | 3 +--
1 files changed, 1 insertion(+), 2 deletions(-)
diff -puN mm/rmap.c~mremap-rmap-comment-fix mm/rmap.c
--- 25/mm/rmap.c~mremap-rmap-comment-fix Tue Mar 30 16:05:22 2004
+++ 25-akpm/mm/rmap.c Tue Mar 30 16:05:22 2004
@@ -315,8 +315,7 @@ static int fastcall try_to_unmap_one(str
return SWAP_AGAIN;
}
-
- /* During mremap, it's possible pages are not in a VMA. */
+ /* unmap_vmas drops page_table_lock with vma unlinked */
vma = find_vma(mm, address);
if (!vma) {
ret = SWAP_FAIL;
_