linux-kernel - Re: [PATCH] ARC: Add guard macro to uapi/asm/unistd.h

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Message-ID: <528DE85B.4010201@gmail.com>
Date:	Thu, 21 Nov 2013 19:02:51 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	linux-kernel@...r.kernel.org,
	Francois Bedard <Francois.Bedard@...opsys.com>,
	Ingo Molnar <mingo@...nel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH] ARC: Add guard macro to uapi/asm/unistd.h

On 11/21/2013 06:57 PM, Chen Gang wrote:
> On 11/21/2013 06:29 PM, Vineet Gupta wrote:
>> Chen originally proposed this as "right thing to do" however I
>> actually ran into this when building perf tools. Some of the utils
>> include unistd.h as well as linux/unistd.h. Since -I includes kernel
>> headers too, we end up including the ARC unistd.h twice, leading to
>> redefinition nwarnings.
>>
>> ------------------>8-------------------
>>     CC bench/sched-pipe.o
>> In file included from ~/kernel/arch/arc/include/uapi/asm/unistd.h:21:0,
>>                  from ~/kernel/include/uapi/linux/unistd.h:7,
>>                  from bench/sched-pipe.c:24:
>> ~/kernel/include/uapi/asm-generic/unistd.h:889:0: error: "__NR_fcntl64"
>> redefined [-Werror]
>>  #define __NR_fcntl64 __NR3264_fcntl
>>  ^
>> In file included from
>> ~/gnu/arc-linux-uclibc/sys-include/sys/syscall.h:24:0,
>>                  from bench/../perf.h:112,
>>                  from bench/sched-pipe.c:13:
>> ~/gnu/arc-linux-uclibc/include/bits/sysnum.h:761:0: note: this is the
>> location of the previous definition
>> ------------------>8-------------------
>>
>> Verified that make headers_install works fine with this.
>>
>> Suggested-by: Chen Gang <gang.chen.5i5j@...il.com>

Also thank you very much, it is my 1st patch with new mail address.  :-)

Thanks.

>> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
>> Cc: David Howells <dhowells@...hat.com>
>> ---
>> I will be adding this to arc tree for 3.13
>> ---
>>  arch/arc/include/uapi/asm/unistd.h | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/arch/arc/include/uapi/asm/unistd.h b/arch/arc/include/uapi/asm/unistd.h
>> index 6f30484f34b7..68125dd766c6 100644
>> --- a/arch/arc/include/uapi/asm/unistd.h
>> +++ b/arch/arc/include/uapi/asm/unistd.h
>> @@ -8,6 +8,9 @@
>>  
>>  /******** no-legacy-syscalls-ABI *******/
>>  
>> +#ifndef _UAPI_ASM_ARC_UNISTD_H
>> +#define _UAPI_ASM_ARC_UNISTD_H
>> +
>>  #define __ARCH_WANT_SYS_EXECVE
>>  #define __ARCH_WANT_SYS_CLONE
>>  #define __ARCH_WANT_SYS_VFORK
>> @@ -32,3 +35,5 @@ __SYSCALL(__NR_arc_gettls, sys_arc_gettls)
>>  /* Generic syscall (fs/filesystems.c - lost in asm-generic/unistd.h */
>>  #define __NR_sysfs		(__NR_arch_specific_syscall + 3)
>>  __SYSCALL(__NR_sysfs, sys_sysfs)
>> +
>> +#endif
>>
> 
> Is it better to append comment for "#endif"?
> 
> e.g. "#endif /* _UAPI_ASM_ARC_UNISTD_H */"
> 
> 
> Thanks.
> 


-- 
Chen Gang
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