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From: liqin.chen@sunplusct.com
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	torvalds@linux-foundation.org
Subject: Re: [PATCH 07/27] score: create head files elf.h emergency-restart.h errno.h
Date: Mon, 15 Jun 2009 20:11:34 +0800	[thread overview]
Message-ID: <OF48364F7F.ED6F93C7-ON482575D6.0042A7E0-482575D6.0043654D@sunplusct.com> (raw)
In-Reply-To: <200906140023.06690.arnd@arndb.de>

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Arnd Bergmann <arnd@arndb.de> дÓÚ 2009-06-14 06:23:06:

> On Saturday 13 June 2009, liqin.chen@sunplusct.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.

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WARNING: multiple messages have this Message-ID (diff)
From: liqin.chen@sunplusct.com
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	torvalds@linux-foundation.org
Subject: Re: [PATCH 07/27] score: create head files elf.h emergency-restart.h errno.h
Date: Mon, 15 Jun 2009 20:11:34 +0800	[thread overview]
Message-ID: <OF48364F7F.ED6F93C7-ON482575D6.0042A7E0-482575D6.0043654D@sunplusct.com> (raw)
In-Reply-To: <200906140023.06690.arnd@arndb.de>

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

> On Saturday 13 June 2009, liqin.chen@sunplusct.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.


  reply	other threads:[~2009-06-15 12:16 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-09  6:26 [PATCH 07/27] score: create head files elf.h emergency-restart.h errno.h liqin.chen
2009-06-09  6:26 ` liqin.chen
2009-06-09 17:20 ` Arnd Bergmann
2009-06-13  6:39   ` liqin.chen
2009-06-13  6:39     ` liqin.chen
2009-06-13 22:23     ` Arnd Bergmann
2009-06-15 12:11       ` liqin.chen [this message]
2009-06-15 12:11         ` liqin.chen
2009-06-15 13:30         ` [PATCH] asm-generic: add EMAXERRNO Arnd Bergmann
2009-06-15 13:31           ` Matthew Wilcox
2009-06-15 14:02             ` Arnd Bergmann
2009-06-16  3:04               ` liqin.chen
2009-06-16  3:04                 ` liqin.chen
2009-06-16 14:13                 ` Arnd Bergmann
2009-06-15 13:33           ` liqin.chen
2009-06-15 13:33             ` liqin.chen

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