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

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Message-ID: <52B2F78A.5060404@gmail.com>
Date:	Thu, 19 Dec 2013 21:41:30 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Francois Bedard <Francois.Bedard@...opsys.com>,
	David Howells <dhowells@...hat.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] Revert "ARC: Add guard macro to uapi/asm/unistd.h"

On 12/19/2013 08:42 PM, Geert Uytterhoeven wrote:
> On Thu, Dec 19, 2013 at 1:34 PM, Chen Gang <gang.chen.5i5j@...il.com> wrote:
>> On 12/19/2013 07:13 PM, Vineet Gupta wrote:
>>> This reverts commit 97bc386fc12deeb41d5bff33548e3002b258d4e0.
>>>
>>> Generic syscall table generator relies on ARCH unistd.h as follows:
>>>
>>>       void *sys_call_table[NR_syscalls] = {
>>>               [0 ... NR_syscalls-1] = sys_ni_syscall,
>>>       #include <asm/unistd.h>
>>>       };
>>>
>>> And turns out that prior dependencies already include that header by
>>> the time preprocessor hits the above. Meaning ARCH unistd.h needs to be
>>> able to included twice.
>>
>> OK, thanks, it sounds reasonable to me.
>>
>> But why many other architectures contents these guard macros? (arm, sh,
>> blackfin, cris, frv, ia64, m32r, m68k, mips, s390, microblaze, mn10300,
>> parisc, powerpc, sparc, x86). Do they need improvement too?
> 
> Those architectures don't use the generic syscall table generator.
> 

OK, thanks. :-)


> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> 


-- 
Chen Gang

Open, share and attitude like air, water and life which God blessed
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