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Groups > linux.kernel > #1203154
| From | Waiman Long <Waiman.Long@hp.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v5 1/6] locking/pvqspinlock: Unconditional PV kick with _Q_SLOW_VAL |
| Date | 2015-08-08 05:20 +0200 |
| Message-ID | <pV2PU-3d1-9@gated-at.bofh.it> (permalink) |
| References | <pV2PT-3d1-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
If _Q_SLOW_VAL has been set, the vCPU state must have been vcpu_hashed. The extra check at the end of __pv_queued_spin_unlock() is unnecessary and so is removed. Signed-off-by: Waiman Long <Waiman.Long@hp.com> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net> --- kernel/locking/qspinlock_paravirt.h | 3 +-- 1 files changed, 1 insertions(+), 2 deletions(-) diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h index c8e6e9a..6eafb9e 100644 --- a/kernel/locking/qspinlock_paravirt.h +++ b/kernel/locking/qspinlock_paravirt.h @@ -364,8 +364,7 @@ __visible void __pv_queued_spin_unlock(struct qspinlock *lock) * vCPU is harmless other than the additional latency in completing * the unlock. */ - if (READ_ONCE(node->state) == vcpu_hashed) - pv_kick(node->cpu); + pv_kick(node->cpu); } /* * Include the architecture specific callee-save thunk of the -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH v5 1/6] locking/pvqspinlock: Unconditional PV kick with _Q_SLOW_VAL Waiman Long <Waiman.Long@hp.com> - 2015-08-08 05:20 +0200
Re: [PATCH v5 1/6] locking/pvqspinlock: Unconditional PV kick with _Q_SLOW_VAL Peter Zijlstra <peterz@infradead.org> - 2015-08-08 08:10 +0200
Re: [PATCH v5 1/6] locking/pvqspinlock: Unconditional PV kick with _Q_SLOW_VAL Waiman Long <waiman.long@hp.com> - 2015-08-14 04:10 +0200
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