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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
This commit is contained in:
Amol Grover 2020-02-16 13:13:30 +05:30 committed by Thomas Gleixner
parent 6e317c32fd
commit 5fb1c2a5bb
1 changed files with 2 additions and 1 deletions
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3
kernel/time/posix-timers.c
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@ -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;
}