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

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Date:	Thu, 19 Dec 2013 13:11:09 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Chen Gang <gang.chen.5i5j@...il.com>
CC:	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 06:04 PM, Chen Gang 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?
>
> And for our case, what xtensa has done looks like a better way to me.

Yeah, looks like that'll work - good find. Linus, please ignore the Revert, I'll
follow up with a pull request.

-Vineet
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