From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arch@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org,
Alexander Graf <agraf@suse.de>, Paul Mackerras <paulus@samba.org>,
David Vrabel <david.vrabel@citrix.com>,
xen-devel@lists.xenproject.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v2 2/3] KVM: PPC: Book3S HV: Use need_resched() instead of should_resched()
Date: Wed, 15 Jul 2015 12:52:03 +0300 [thread overview]
Message-ID: <20150715095203.12246.72922.stgit@buzz> (raw)
In-Reply-To: <20150715095201.12246.49283.stgit@buzz>
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>
---
arch/powerpc/kvm/book3s_hv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 68d067ad4222..a9f753fb73a8 100644
--- 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_run *kvm_run, struct kvm_vcpu *vcpu)
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);
next prev parent reply other threads:[~2015-07-15 9:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-15 9:52 [PATCH v2 1/3] drivers/xen/preempt: use need_resched() instead of should_resched() Konstantin Khlebnikov
2015-07-15 9:52 ` Konstantin Khlebnikov [this message]
2015-07-15 9:52 ` [PATCH v2 3/3] sched/preempt: fix cond_resched_lock() and cond_resched_softirq() Konstantin Khlebnikov
2015-07-15 12:16 ` Eric Dumazet
2015-07-15 12:52 ` Konstantin Khlebnikov
2015-07-15 13:35 ` Peter Zijlstra
2015-07-20 13:41 ` [Xen-devel] [PATCH v2 1/3] drivers/xen/preempt: use need_resched() instead of should_resched() David Vrabel
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