| commit | 8bdafa39a47265bc029838b35cc6585f69224afa | [log] [tgz] |
|---|---|---|
| author | Anton Blanchard <anton@samba.org> | Wed Sep 14 09:43:15 2011 +0000 |
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | Tue Sep 20 15:53:23 2011 +1000 |
| tree | cade05d9d67d3c6c421f46012961a46dacae5d70 | |
| parent | a11940978bd598e65996b4f807cf4904793f7025 [diff] |
powerpc: Fix deadlock in icswx code
The icswx code introduced an A-B B-A deadlock:
CPU0 CPU1
---- ----
lock(&anon_vma->mutex);
lock(&mm->mmap_sem);
lock(&anon_vma->mutex);
lock(&mm->mmap_sem);
Instead of using the mmap_sem to keep mm_users constant, take the
page table spinlock.
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>