Patch "sched/preempt, powerpc, kvm: Use need_resched() instead of should_resched()" has been added to the 4.2-stable tree

Patch "sched/preempt, powerpc, kvm: Use need_resched() instead of should_resched()" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    sched/preempt, powerpc, kvm: Use need_resched() instead of should_resched()

to the 4.2-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:
     sched-preempt-powerpc-kvm-use-need_resched-instead-of-should_resched.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c56dadf39761a6157239cac39e3988998c994f98 Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Date: Wed, 15 Jul 2015 12:52:03 +0300
Subject: sched/preempt, powerpc, kvm: Use need_resched() instead of should_resched()

From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>

commit c56dadf39761a6157239cac39e3988998c994f98 upstream.

Function should_resched() is equal to (!preempt_count() && need_resched()).
In preemptive kernel preempt_count here is non-zero because of vc->lock.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Graf <agraf@suse.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150715095203.12246.72922.stgit@buzz
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/kvm/book3s_hv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2178,7 +2178,7 @@ static int kvmppc_run_vcpu(struct kvm_ru
 		vc->runner = vcpu;
 		if (n_ceded == vc->n_runnable) {
 			kvmppc_vcore_blocked(vc);
-		} else if (should_resched()) {
+		} else if (need_resched()) {
 			vc->vcore_state = VCORE_PREEMPT;
 			/* Let something else run */
 			cond_resched_lock(&vc->lock);


Patches currently in stable-queue which might be from khlebnikov@yandex-team.ru are

queue-4.2/sched-preempt-fix-cond_resched_lock-and-cond_resched_softirq.patch
queue-4.2/sched-preempt-xen-use-need_resched-instead-of-should_resched.patch
queue-4.2/sched-preempt-powerpc-kvm-use-need_resched-instead-of-should_resched.patch