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| author | Paul E. McKenney <[email protected]> | 2010-07-20 20:24:34 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2010-07-20 23:25:41 +0000 |
| commit | 844b9a8707f1fcf0482e0c52f44a555e799ccda6 (patch) | |
| tree | c9c095c123c2988b014e39b461eb04411b3a197d /fs/jbd/commit.c | |
| parent | sdhci-s3c: add missing remove function (diff) | |
| download | kernel-844b9a8707f1fcf0482e0c52f44a555e799ccda6.tar.gz kernel-844b9a8707f1fcf0482e0c52f44a555e799ccda6.zip | |
vfs: fix RCU-lockdep false positive due to /proc
If a single-threaded process does a file-descriptor operation, and some
other process accesses that same file descriptor via /proc, the current
rcu_dereference_check_fdtable() can give a false-positive RCU-lockdep
splat due to the reference count being increased by the /proc access after
the reference-count check in fget_light() but before the check in
rcu_dereference_check_fdtable().
This commit prevents this false positive by checking for a single-threaded
process. To avoid #include hell, this commit uses the wrapper for
thread_group_empty(current) defined by rcu_my_thread_group_empty()
provided in a separate commit.
Located-by: Miles Lane <[email protected]>
Located-by: Eric Dumazet <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'fs/jbd/commit.c')
0 files changed, 0 insertions, 0 deletions