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Date: Mon, 17 Feb 2020 15:40:48 -0000 From: "tip-bot2 for Amol Grover" <tip-bot2@...utronix.de> To: linux-tip-commits@...r.kernel.org Cc: Amol Grover <frextrite@...il.com>, Thomas Gleixner <tglx@...utronix.de>, x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org> Subject: [tip: timers/core] posix-timers: Pass lockdep expression to RCU lists The following commit has been merged into the timers/core branch of tip: Commit-ID: 9ea9c60fc23c35f865725ab390ca4308de919bb0 Gitweb: https://git.kernel.org/tip/9ea9c60fc23c35f865725ab390ca4308de919bb0 Author: Amol Grover <frextrite@...il.com> AuthorDate: Sun, 16 Feb 2020 13:13:30 +05:30 Committer: Thomas Gleixner <tglx@...utronix.de> CommitterDate: Mon, 17 Feb 2020 16:39:28 +01:00 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@...il.com> Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Link: https://lkml.kernel.org/r/20200216074330.GA14025@workstation-portable --- kernel/time/posix-timers.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index ff0eb30..07709ac 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; }
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