linux-kernel - Re: [PATCH v9 03/19] qspinlock: Add pending bit

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Message-ID: <20140418081345.GX11096@twins.programming.kicks-ass.net>
Date:	Fri, 18 Apr 2014 10:13:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Waiman Long <waiman.long@...com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	Paolo Bonzini <paolo.bonzini@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Scott J Norton <scott.norton@...com>,
	Chegu Vinod <chegu_vinod@...com>
Subject: Re: [PATCH v9 03/19] qspinlock: Add pending bit

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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