linux-kernel - Re: [PATCH] Fix compile breakage caused by asmlinkage

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Date:	Fri, 11 Apr 2008 07:46:48 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jakub Jelinek <jakub@...hat.com>,
	Dave Jones <davej@...hat.com>, drepper@...hat.com,
	mingo@...hat.com, tglx@...hat.com, linux-kernel@...r.kernel.org,
	Roland McGrath <roland@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH] Fix compile breakage caused by asmlinkage_protect



On Fri, 11 Apr 2008, Heiko Carstens wrote:
> 
> git commit 54a015104136974262afa4b8ddd943ea70dec8a2
> "asmlinkage_protect replaces prevent_tail_call" causes this build failure
> on s390:
> 
>   AS      arch/s390/kernel/entry64.o
> In file included from arch/s390/kernel/entry64.S:14:
> include/linux/linkage.h:34: error: syntax error in macro parameter list
> make[1]: *** [arch/s390/kernel/entry64.o] Error 1
> make: *** [arch/s390/kernel] Error 2

Ok, that's just _odd_.

> So just surround the new define with an #ifndef __ASSEMBLY__ to prevent
> any side effects on asm code.

There are no side effects on asm code. It just adds a #define that 
obviously won't be used.

Is the s390 assembler using some strange C pre-processor that is different 
from the main C preprocessor and doesn't understand this pattern?

I really think you should fix *that*, because otherwise you'll hit these 
kinds of bugs occasionally. There aren't that many asm files, it's not 
worth it optimizing them to use some faster-but-stupider preprocessor.

			Linus
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