linux-kernel - Re: [RFC][PATCH 5/5] arch: Sanitize atomic

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Message-ID: <20140206180930.GJ5002@laptop.programming.kicks-ass.net>
Date:	Thu, 6 Feb 2014 19:09:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 5/5] arch: Sanitize atomic_t bitwise ops

On Thu, Feb 06, 2014 at 09:56:54AM -0800, Linus Torvalds wrote:
> On Thu, Feb 6, 2014 at 9:52 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> It's the "_return" variants. As far as I can tell, there are exactly
> ZERO users of that stuff, and they are BAD BAD BAD.
> 
> On x86, those things would cause a cmpxchg loop, and the bad
> read-for-shared-before-acquire cacheline pattern.
> 
> So why indirectly encourage people to add users for a bad operation?

OK, I'll not generate the _return() variants.
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