linux-kernel - Re: [PATCH v1 11/15] arm/futex: UP futex_atomic_op

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Message-ID: <20150513081956.GB21106@linutronix.de>
Date:	Wed, 13 May 2015 10:19:56 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	David Hildenbrand <dahi@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	yang.shi@...driver.com, benh@...nel.crashing.org, paulus@...ba.org,
	akpm@...ux-foundation.org, heiko.carstens@...ibm.com,
	schwidefsky@...ibm.com, borntraeger@...ibm.com, mst@...hat.com,
	tglx@...utronix.de, David.Laight@...LAB.COM, hughd@...gle.com,
	hocko@...e.cz, ralf@...ux-mips.org, herbert@...dor.apana.org.au,
	linux@....linux.org.uk, airlied@...ux.ie, daniel.vetter@...el.com,
	linux-mm@...ck.org, linux-arch@...r.kernel.org,
	peterz@...radead.org
Subject: Re: [PATCH v1 11/15] arm/futex: UP futex_atomic_op_inuser() relies
 on disabled preemption

* David Hildenbrand | 2015-05-13 09:38:12 [+0200]:

>Thanks, I'll include it in the next version.
>
>So I assume the cleanest thing to do would be:
>
>#if __LINUX_ARM_ARCH__ < 6
>	preempt_disable();
>#endif

Correct. But also for futex_atomic_cmpxchg_inatomic() which also behind
CONFIG_SMP curtain. That is why I suggested a new patch :)

>David

Sebastian
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