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| author | Rik van Riel | 2010-08-10 02:18:39 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2010-08-10 05:44:55 +0200 |
| commit | 5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 (patch) | |
| tree | 41f05611f8b1d7562c2193ade8c089408f262a6b /mm/mmap.c | |
| parent | mm: change direct call of spin_lock(anon_vma->lock) to inline function (diff) | |
| download | kernel-qcow2-linux-5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1.tar.gz kernel-qcow2-linux-5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1.tar.xz kernel-qcow2-linux-5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1.zip | |
mm: track the root (oldest) anon_vma
Track the root (oldest) anon_vma in each anon_vma tree. Because we only
take the lock on the root anon_vma, we cannot use the lock on higher-up
anon_vmas to lock anything. This makes it impossible to do an indirect
lookup of the root anon_vma, since the data structures could go away from
under us.
However, a direct pointer is safe because the root anon_vma is always the
last one that gets freed on munmap or exit, by virtue of the same_vma list
order and unlink_anon_vmas walking the list forward.
[akpm@linux-foundation.org: fix typo]
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Larry Woodman <lwoodman@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
0 files changed, 0 insertions, 0 deletions