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@xxxxxxxxxxxxxxx> know about it.
>From c56dadf39761a6157239cac39e3988998c994f98 Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Alexander Graf <agraf@xxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20150715095203.12246.72922.stgit@buzz
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxxxxx 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
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