linux-kernel - Re: [PATCH] sched, time: fix build error with 64 bit cputime

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Message-ID: <20140930190859.GO4241@worktop.programming.kicks-ass.net>
Date:	Tue, 30 Sep 2014 21:08:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Rik van Riel <riel@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	umgwanakikbuti@...il.com, akpm@...ux-foundation.org,
	srao@...hat.com, lwoodman@...hat.com, atheurer@...hat.com,
	oleg@...hat.com, Ingo Molnar <mingo@...nel.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] sched, time: fix build error with 64 bit cputime_t on 32
 bit systems

On Tue, Sep 30, 2014 at 09:06:13PM +0200, Frederic Weisbecker wrote:
> Maybe cmpxchg() should itself be a wrapper that does this build time choice
> between cmpxchg32() and cmpxchg64().
> 
> And if it looks too dangerous to convert all users, this could be cmpxchg_t().

It cannot, not all 32bit archs can do a 64bit cmpxchg.
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