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Re: [Xen-devel] [PATCH v9 03/19] qspinlock: Add pending bit
- To: Waiman Long <waiman.long@xxxxxx>
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Fri, 18 Apr 2014 10:13:45 +0200
- Cc: linux-arch@xxxxxxxxxxxxxxx, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Scott J Norton <scott.norton@xxxxxx>, x86@xxxxxxxxxx, Paolo Bonzini <paolo.bonzini@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Chegu Vinod <chegu_vinod@xxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>
- Delivery-date: Fri, 18 Apr 2014 08:14:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Thu, Apr 17, 2014 at 05:20:31PM -0400, Waiman Long wrote:
> >>+ while ((val = atomic_read(&lock->val))& _Q_LOCKED_MASK)
> >>+ arch_mutex_cpu_relax();
> >That was a cpu_relax().
>
> Yes, but arch_mutex_cpu_relax() is the same as cpu_relax() for x86.
Yeah, so why bother typing more?
Let the s390 people sort that if/when they try and make this work for
them.
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