linux-kernel - Re: [Patch] uml: fix one compile error

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Date:	Fri, 17 Oct 2008 15:27:25 +0100
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	xiyou.wangcong@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, jdike@...toit.com, stable@...nel.org
Subject: Re: [Patch] uml: fix one compile error

On Fri, Oct 17, 2008 at 02:32:10PM +0200, Miklos Szeredi wrote:
>On Fri, 17 Oct 2008, =?utf-8?Q?Am=C3=A9rico?= Wang wrote:
>> On Thu, Oct 16, 2008 at 04:15:57PM -0700, Andrew Morton wrote:
>> >On Thu, 16 Oct 2008 16:26:26 +0100
>> >Am__rico Wang <xiyou.wangcong@...il.com> wrote:
>> >
>> >> 
>> >> This patch fixed the following compile error:
>> >> 
>> >>   CC      arch/um/sys-i386/signal.o
>> >>   /home/wangcong/Projects/linux-2.6/arch/um/sys-i386/signal.c: In
>> >> function 'copy_sc_from_user':
>> >> /home/wangcong/Projects/linux-2.6/arch/um/sys-i386/signal.c:182:
>> >> warning: dereferencing 'void *' pointer
>> >> /home/wangcong/Projects/linux-2.6/arch/um/sys-i386/signal.c:182:
>> >> error: request for member '_fxsr_env' in something not a structure or
>> >> union
>> >> 
>> >> 
>> >> Signed-off-by: WANG Cong <wangcong@...ux.org>
>> >> Cc: jdike@...toit.com
>> >> 
>> >> ---
>> >> diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
>> >> index fd0c25a..1296473 100644
>> >> --- a/arch/um/sys-i386/signal.c
>> >> +++ b/arch/um/sys-i386/signal.c
>> >> @@ -179,7 +179,8 @@ static int copy_sc_from_user(struct pt_regs *regs,
>> >>  	if (have_fpx_regs) {
>> >>  		struct user_fxsr_struct fpx;
>> >>  
>> >> -		err = copy_from_user(&fpx, &sc.fpstate->_fxsr_env[0],
>> >> +		err = copy_from_user(&fpx,
>> >> +			&((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0],
>> >>  				     sizeof(struct user_fxsr_struct));
>> >>  		if (err)
>> >>  			return 1;
>> >
>> >Which kernel versions are affected by this error? 2.6.27?
>> 
>> I haven't tried a stable version, but I will. :)
>
>2.6.27 as UML works for me without the patch.
>
>But it is needed for 2.6.28...  thanks.
>
>Tested-by: Miklos Szeredi <mszeredi@...e.cz>

Thank you! :)


-- 
"Sometimes the only way to stay sane is to go a little crazy."

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