linux-kernel - Re: [PATCH v8 4/4] qrwlock: Use smp_store_release() in write

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Message-ID: <20140115232134.GM31570@twins.programming.kicks-ass.net>
Date:	Thu, 16 Jan 2014 00:21:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Richard Henderson <rth@...ddle.net>,
	Matt Turner <mattst88@...il.com>,
	Daniel J Blueman <daniel@...ascale.com>,
	Waiman Long <waiman.long@...com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH v8 4/4] qrwlock: Use smp_store_release() in write_unlock()

On Wed, Jan 15, 2014 at 12:53:46PM -0800, Paul E. McKenney wrote:
> But we did drop support for SMP i386 quite some time ago, so perhaps
> it is time to drop support for SMP Alpha pre-EV56.

So while the primitive is called smp_store_release() the !SMP variant
still does:
 
  *(volatile __type *) = ptr;

which should not compile on any Alpha pre EV56, SMP or no for __type ==
u8.
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