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SubjectRe: [PATCH] ARC: Add guard macro to uapi/asm/unistd.h
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@gmail.com>
> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
> Cc: David Howells <dhowells@redhat.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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