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| author | Peter Zijlstra <peterz@infradead.org> | 2014-09-24 10:18:54 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-10-28 10:56:37 +0100 |
| commit | 26cabd31259ba43f68026ce3f62b78094124333f (patch) | |
| tree | 8767ef0e03cb669bb361da73a8ae609c38b7f41b | |
| parent | 3c9b2c3d64a49f264422d7743599cf7f6535972d (diff) | |
| download | linux-26cabd31259ba43f68026ce3f62b78094124333f.tar.gz linux-26cabd31259ba43f68026ce3f62b78094124333f.tar.bz2 linux-26cabd31259ba43f68026ce3f62b78094124333f.zip | |
sched, net: Clean up sk_wait_event() vs. might_sleep()
WARNING: CPU: 1 PID: 1744 at kernel/sched/core.c:7104 __might_sleep+0x58/0x90()
do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff81070e10>] prepare_to_wait+0x50 /0xa0
[<ffffffff8105bc38>] __might_sleep+0x58/0x90
[<ffffffff8148c671>] lock_sock_nested+0x31/0xb0
[<ffffffff81498aaa>] sk_stream_wait_memory+0x18a/0x2d0
Which is a false positive because sk_wait_event() will already have
TASK_RUNNING at that point if it would've gone through
schedule_timeout().
So annotate with sched_annotate_sleep(); which goes away on !DEBUG builds.
Reported-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140924082242.524407432@infradead.org
Cc: David S. Miller <davem@davemloft.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: netdev@vger.kernel.org
Cc: tglx@linutronix.de
Cc: ilya.dryomov@inktank.com
Cc: umgwanakikbuti@gmail.com
Cc: oleg@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | include/net/sock.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/sock.h b/include/net/sock.h index 7db3db112baa..e6f235ebf6c9 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -897,6 +897,7 @@ static inline void sock_rps_reset_rxhash(struct sock *sk) if (!__rc) { \ *(__timeo) = schedule_timeout(*(__timeo)); \ } \ + sched_annotate_sleep(); \ lock_sock(__sk); \ __rc = __condition; \ __rc; \ |