linux-kernel - Re: [PATCH] introduce kernel_execve function to replace __KERNEL_SYSCALLS_

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Date:	Tue, 22 Aug 2006 17:29:02 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Björn Steinbrink <B.Steinbrink@....de>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Andrew Morton <akpm@...l.org>, rusty@...tcorp.com.au,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] introduce kernel_execve function to replace
	__KERNEL_SYSCALLS__

On Mon, 2006-08-21 at 17:12 +0200, Arnd Bergmann wrote:
> On Monday 21 August 2006 02:36, Paul Mackerras wrote:
> > > Iit turned out most of the architectures that already implement
> > > their own execve() call instead of using the _syscall3 function
> > > for it end up passing the return value of sys_execve down, 
> > > instead of setting errno.
> > 
> > I really don't like having an "errno" variable in the kernel.  What if
> > two processes are doing an execve concurrently?
> 
> The point is that we have two different schemes in the kernel that
> conflict:
> 
> alpha, arm{,26}, ia64, parisc, powerpc and x86_64 pass the error
> code from execve, all others pass -1 and set the global errno.

All other need to be fixed then... having an errno is just plain wrong.


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