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 <stable@xxxxxxxxxxxxxxx> know about it.
>From f466ae66fa6a599f9a53b5f9bafea4b8cfffa7fb Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Date: Mon, 9 Jan 2017 23:23:15 -0800
Subject: rcu: Remove cond_resched() from Tiny synchronize_sched()
From: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
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 <paulmck@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxxxxxxxxx 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
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