From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:40034 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751206AbdAWOUd (ORCPT ); Mon, 23 Jan 2017 09:20:33 -0500 Subject: Patch "rcu: Remove cond_resched() from Tiny synchronize_sched()" has been added to the 4.9-stable tree To: paulmck@linux.vnet.ibm.com, gregkh@linuxfoundation.org Cc: , From: Date: Mon, 23 Jan 2017 15:20:37 +0100 Message-ID: <148518123720510@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled rcu: Remove cond_resched() from Tiny synchronize_sched() to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: rcu-remove-cond_resched-from-tiny-synchronize_sched.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From f466ae66fa6a599f9a53b5f9bafea4b8cfffa7fb Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 9 Jan 2017 23:23:15 -0800 Subject: rcu: Remove cond_resched() from Tiny synchronize_sched() From: Paul E. McKenney commit f466ae66fa6a599f9a53b5f9bafea4b8cfffa7fb upstream. It is now legal to invoke synchronize_sched() at early boot, which causes Tiny RCU's synchronize_sched() to emit spurious splats. This commit therefore removes the cond_resched() from Tiny RCU's synchronize_sched(). Fixes: 8b355e3bc140 ("rcu: Drive expedited grace periods from workqueue") Signed-off-by: Paul E. McKenney Signed-off-by: Greg Kroah-Hartman --- kernel/rcu/tiny.c | 4 ---- 1 file changed, 4 deletions(-) --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -185,9 +185,6 @@ static __latent_entropy void rcu_process * benefits of doing might_sleep() to reduce latency.) * * Cool, huh? (Due to Josh Triplett.) - * - * But we want to make this a static inline later. The cond_resched() - * currently makes this problematic. */ void synchronize_sched(void) { @@ -195,7 +192,6 @@ void synchronize_sched(void) lock_is_held(&rcu_lock_map) || lock_is_held(&rcu_sched_lock_map), "Illegal synchronize_sched() in RCU read-side critical section"); - cond_resched(); } EXPORT_SYMBOL_GPL(synchronize_sched); Patches currently in stable-queue which might be from paulmck@linux.vnet.ibm.com are queue-4.9/rcu-narrow-early-boot-window-of-illegal-synchronous-grace-periods.patch queue-4.9/rcu-remove-cond_resched-from-tiny-synchronize_sched.patch