linux-kernel - Re: [tip:x86:fpu 2/2] arch/x86/kernel/signal.c:626:4: error: implicit declaration of function '__setup

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Date:	Wed, 08 Aug 2012 15:34:11 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	Fengguang Wu <fengguang.wu@...el.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [tip:x86:fpu 2/2] arch/x86/kernel/signal.c:626:4: error: implicit
 declaration of function '__setup_frame'

On 07/26/2012 10:48 AM, Suresh Siddha wrote:
>
> Appended the patch for this. Thanks!
> ---
> From: Suresh Siddha <suresh.b.siddha@...el.com>
> Subject: x86, fpu: fix x86_64 build without CONFIG_IA32_EMULATION
>
> Fengguang's automated build reported some compilation failures:
>> arch/x86/kernel/signal.c: In function 'setup_rt_frame':
>> arch/x86/kernel/signal.c:626:4: error: implicit declaration of function '__setup_frame'
>> arch/x86/kernel/xsave.c: In function 'save_fsave_header':
>> arch/x86/kernel/xsave.c:144:7: error: dereferencing pointer to incomplete type
>> ...
>
> Fix x86_64 kernel build without CONFIG_IA32_EMULATION.
>
> Code saving fsave prefix is applicable only for CONFIG_X86_32 or
> CONFIG_IA32_EMULATION. Use config_enabled() checks to remove the unnecessary
> code compile-time for x86_64 kernels build without CONFIG_IA32_EMULATION.
>
> Also while we are at this, fix a spurious warning:
>> arch/x86/kernel/xsave.c:209:15: warning: ignoring return value of ‘__clear_user’, declared with attribute warn_unused_result
>
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>

With this patch applied I get an error at:

/home/hpa/kernel/tip.x86-fpu/arch/x86/kernel/signal.c:792:12: error: 
static declaration of ‘x32_setup_rt_frame’ follows non-static declaration
In file included from 
/home/hpa/kernel/tip.x86-fpu/arch/x86/kernel/signal.c:29:0:
/home/hpa/kernel/tip.x86-fpu/arch/x86/include/asm/fpu-internal.h:62:5: 
note: previous declaration of ‘x32_setup_rt_frame’ was here
/home/hpa/kernel/tip.x86-fpu/arch/x86/kernel/signal.c:792:12: warning: 
‘x32_setup_rt_frame’ defined but not used [-Wunused-function]
make[4]: *** [arch/x86/kernel/signal.o] Error 1
make[3]: *** [arch/x86/kernel] Error 2
make[2]: *** [arch/x86] Error 2
make[1]: *** [sub-make] Error 2
make[1]: Leaving directory `/home/hpa/kernel/tip.x86-fpu'

... for an x86-64 allyesconfig.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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