linux-kernel - Re: [PATCH 07/27] score: create head files elf.h emergency-restart.h errno.h

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Date:	Mon, 15 Jun 2009 20:11:34 +0800
From:	liqin.chen@...plusct.com
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 07/27] score: create head files elf.h emergency-restart.h
 errno.h

Arnd Bergmann <arnd@...db.de> 写于 2009-06-14 06:23:06:

> On Saturday 13 June 2009, liqin.chen@...plusct.com wrote:
> > > 
> > > EMAXERRNO is mips specific right now. Do you actually need it 
somewhere?
> > > 
> > 
> > Yes, I used it in entry.S, maybe I could remove this define latter.
> > 
> 
> Ok. Note that the maximum error number that is supposed to get sent back
> to user space is 511. Most architectures check the return value of the
> system call to be between -4095 and zero upon entering user space.
> Checking it in the kernel gives you the chance to override the
> error status from a system call with force_successful_syscall_return().
> 
> If that is your intention, you should probably leave the definition in 
there.
> Powerpc uses _LAST_ERRNO for the same purpose, which is somewhat 
inconsistent
> with mips and also uses a different value to compare against.
> 

Maybe I can don't use EMAXERRNO in score code. But I think define a 
maximum error number in asm-generic/errno.h is better.