linux-kernel - [GIT PULL] timers fix

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Date: Sun, 17 Mar 2024 10:04:49 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <frederic@...nel.org>
Subject: [GIT PULL] timers fix

Linus,

Please pull the latest timers/urgent git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-urgent-2024-03-17

   # HEAD: 4b6f4c5a67c07417bf29d896c76f513a4be07516 timer/migration: Remove buggy early return on deactivation

Fix timer migration bug that can result in long bootup
delays and other oddities.

 Thanks,

	Ingo

------------------>
Frederic Weisbecker (1):
      timer/migration: Remove buggy early return on deactivation


 kernel/time/timer_migration.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c
index 8f49b6b96dfd..611cd904f035 100644
--- a/kernel/time/timer_migration.c
+++ b/kernel/time/timer_migration.c
@@ -751,26 +751,6 @@ bool tmigr_update_events(struct tmigr_group *group, struct tmigr_group *child,
 
 		first_childevt = evt = data->evt;
 
-		/*
-		 * Walking the hierarchy is required in any case when a
-		 * remote expiry was done before. This ensures to not lose
-		 * already queued events in non active groups (see section
-		 * "Required event and timerqueue update after a remote
-		 * expiry" in the documentation at the top).
-		 *
-		 * The two call sites which are executed without a remote expiry
-		 * before, are not prevented from propagating changes through
-		 * the hierarchy by the return:
-		 *  - When entering this path by tmigr_new_timer(), @evt->ignore
-		 *    is never set.
-		 *  - tmigr_inactive_up() takes care of the propagation by
-		 *    itself and ignores the return value. But an immediate
-		 *    return is required because nothing has to be done in this
-		 *    level as the event could be ignored.
-		 */
-		if (evt->ignore && !remote)
-			return true;
-
 		raw_spin_lock(&group->lock);
 
 		childstate.state = 0;