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| author |   Amol Grover <frextrite@gmail.com> | 2020-02-16 13:13:30 +0530 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2020-02-17 20:12:19 +0100 |
| commit | 5fb1c2a5bbf79ccca8d17cf97f66085be5808027 (patch) | |
| tree | a3bd43ae2ceb5e728ddce3def0bc9cf72780c65e | |
| parent | timer: Improve the comment describing schedule_timeout() (diff) | |
| download | linux-dev-5fb1c2a5bbf79ccca8d17cf97f66085be5808027.tar.xz linux-dev-5fb1c2a5bbf79ccca8d17cf97f66085be5808027.zip | |
posix-timers: Pass lockdep expression to RCU lists
head is traversed using hlist_for_each_entry_rcu outside an RCU read-side
critical section but under the protection of hash_lock.
Hence, add corresponding lockdep expression to silence false-positive
lockdep warnings, and harden RCU lists.
[ tglx: Removed the macro and put the condition right where it's used ]
Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200216074330.GA14025@workstation-portable
| -rw-r--r-- | kernel/time/posix-timers.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index ff0eb30de346..07709ac30439 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -121,7 +121,8 @@ static struct k_itimer *__posix_timers_find(struct hlist_head *head, { struct k_itimer *timer; - hlist_for_each_entry_rcu(timer, head, t_hash) { + hlist_for_each_entry_rcu(timer, head, t_hash, + lockdep_is_held(&hash_lock)) { if ((timer->it_signal == sig) && (timer->it_id == id)) return timer; } |