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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-09-22 08:38:44 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-09-23 08:25:17 -0700 |
| commit | b3a084b9b684622b149e8dcf03855bf0d5fb588b (patch) | |
| tree | 0c04087b9819e64530f14aed21eb4e3453d75d53 | |
| parent | 27c379f7f89a4d558c685b5d89b5ba2fe79ae701 (diff) | |
| download | op-kernel-dev-b3a084b9b684622b149e8dcf03855bf0d5fb588b.zip op-kernel-dev-b3a084b9b684622b149e8dcf03855bf0d5fb588b.tar.gz | |
rcu: rcu_read_lock_bh_held(): disabling irqs also disables bh
rcu_dereference_bh() doesnt know yet about hard irq being disabled, so
lockdep can trigger in netpoll_rx() after commit f0f9deae9e7c4 (netpoll:
Disable IRQ around RCU dereference in netpoll_rx)
Reported-by: Miles Lane <miles.lane@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Tested-by: Miles Lane <miles.lane@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| -rw-r--r-- | include/linux/rcupdate.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 9fbc54a..83af1f8 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -454,7 +454,7 @@ static inline notrace void rcu_read_unlock_sched_notrace(void) * Makes rcu_dereference_check() do the dirty work. */ #define rcu_dereference_bh(p) \ - rcu_dereference_check(p, rcu_read_lock_bh_held()) + rcu_dereference_check(p, rcu_read_lock_bh_held() || irqs_disabled()) /** * rcu_dereference_sched - fetch RCU-protected pointer, checking for RCU-sched |
