linux-kernel - Re: [PATCH, x86]: Fix movq immediate operand constraints in uaccess

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Date:	Mon, 20 Jul 2009 20:59:53 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Uros Bizjak <ubizjak@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	x86@...nel.org
Subject: Re: [PATCH, x86]: Fix movq immediate operand constraints in uaccess_64.h

Uros Bizjak wrote:
> On 07/19/2009 06:06 PM, Uros Bizjak wrote:
>> Hello!
>>
>> arch/x86/include/asm/uaccess_64.h uses wrong asm operand constraint
>> ("ir") for movq insn. Since movq sign-extends its immediate operand,
>> "er" constraint should be used instead.
>>
>> Attached patch changes all uses of __put_user_asm in uaccess_64.h to
>> use "er" when "q" insn suffix is involved.
>>
>> Patch was compile tested on x86_64 with defconfig.
>>
>> Uros.
> 
> Uh, missed signed-off line and Cc, so:
> 

Good catch.  This seems to also apply to the "Zr" constraints in
asm/uaccess.h.

	-hpa
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