Commit 5fb1c2a5 authored Feb 16, 2020 by Amol Grover Committed by Thomas Gleixner Feb 17, 2020

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

parent 6e317c32

kernel/time/posix-timers.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}

Admin message