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| author | Hugh Dickins <hughd@google.com> | 2011-05-20 15:47:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-20 16:23:19 -0700 |
| commit | e6c9366b2adb52cba64b359b3050200743c7568c (patch) | |
| tree | 8e092d9b865734f31116583a2db20971e1c352ee | |
| parent | 6de06f313a65d0ecabf055e708d082002b568866 (diff) | |
| download | blackbird-op-linux-e6c9366b2adb52cba64b359b3050200743c7568c.tar.gz blackbird-op-linux-e6c9366b2adb52cba64b359b3050200743c7568c.zip | |
tmpfs: fix highmem swapoff crash regression
Commit 778dd893ae78 ("tmpfs: fix race between umount and swapoff")
forgot the new rules for strict atomic kmap nesting, causing
WARNING: at arch/x86/mm/highmem_32.c:81
from __kunmap_atomic(), then
BUG: unable to handle kernel paging request at fffb9000
from shmem_swp_set() when shmem_unuse_inode() is handling swapoff with
highmem in use. My disgrace again.
See
https://bugzilla.kernel.org/show_bug.cgi?id=35352
Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/shmem.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index dfc7069102ee..ba4ad28b7db6 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -916,11 +916,12 @@ static int shmem_unuse_inode(struct shmem_inode_info *info, swp_entry_t entry, s if (size > ENTRIES_PER_PAGE) size = ENTRIES_PER_PAGE; offset = shmem_find_swp(entry, ptr, ptr+size); + shmem_swp_unmap(ptr); if (offset >= 0) { shmem_dir_unmap(dir); + ptr = shmem_swp_map(subdir); goto found; } - shmem_swp_unmap(ptr); } } lost1: |
