linux-kernel - Re: [PATCH] x86: Make variable_test

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Message-ID: <4E8E81AC.4090306@hitachi.com>
Date:	Fri, 07 Oct 2011 13:35:56 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Josh Stone <jistone@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"hpanvin@...il.com" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Jakub Jelinek <jakub@...hat.com>
Subject: Re: [PATCH] x86: Make variable_test_bit reference all of *addr

Hi Josh,

Thank you for reporting details :)

(2011/10/07 11:50), Josh Stone wrote:
> We can make twobyte_is_boostable[] volatile instead, which does the
> trick, but that seems a kludge to me.

I think this time we'd better to do this (with comments),
since this may not affect most of bitmap users using it for
checking dynamically allocated bit-flags. kprobe's bitmap
usage seems a special case.

Thank you,

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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