linux-kernel - Re: [PATCH v2] sched, time: fix build error with 64 bit cputime

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Message-ID: <56858913.p3zUxZnKZn@wuerfel>
Date:	Tue, 30 Sep 2014 22:07:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>, atheurer@...hat.com,
	srao@...hat.com, fweisbec@...il.com, oleg@...hat.com,
	Ingo Molnar <mingo@...nel.org>, umgwanakikbuti@...il.com,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lwoodman@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched, time: fix build error with 64 bit cputime_t on 32 bit systems

On Tuesday 30 September 2014 15:59:47 Rik van Riel wrote:
> Subject: sched,time: fix build error with 64 bit cputime_t on 32 bit systems
> 
> On 32 bit systems cmpxchg cannot handle 64 bit values, so
> some additional magic is required to allow a 32 bit system
> with CONFIG_VIRT_CPU_ACCOUNTING_GEN enabled to build.
> 
> Make sure the correct cmpxchg function is used when doing
> an atomic swap of a cputime_t.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>
> Reported-by: Arnd Bergmann <arnd@...db.de>
> 

Now builds without warnings on both 32-bit and 64-bit cputime_t configurations
on arm32.

Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks!

	Arnd
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