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

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Date:	Sun, 20 Aug 2006 22:36:04 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Chase Venters <chase.venters@...entec.com>,
	Andrew Morton <akpm@...l.org>, Arnd Bergmann <arnd@...db.de>,
	Russell King <rmk+lkml@....linux.org.uk>,
	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 2006.08.20 22:20:28 +0200, Arjan van de Ven wrote:
> On Sun, 2006-08-20 at 22:11 +0200, Björn Steinbrink wrote:
> > On 2006.08.20 21:50:46 +0200, Arjan van de Ven wrote:
> > > \
> > > > Could we rename __syscall_return to IS_SYS_ERR (or whatever) and force
> > > > kernel syscall users to do the check? That way we could eliminate errno
> > > 
> > > s/users/user/ .. there's one left that should die out soon ;)
> > > 
> > 
> > Only one in unistd.h, but throughout the kernel there are quite a few
> > unless I'm missing something here:
> > doener@...ola:~/src/kernel/linux-2.6$ grep \ _syscall * -R | \
> > > grep -v define\\\|undef\\\|clobber | wc -l
> > 116
> > 
> > Are these just going to be replaced by calls to sys_whatever?
> 
> they're not the users of this, they're the definitions... ;)

Well, I assume that if some code defines a syscall, it will actually use
it. Of course I meant to ask if the users of those definitions are going
to just call sys_whatever.
For example check_host_supports_tls in arch/um/os-Linux/sys-i386/tls.c
which even uses the global errno (although in that case the whole
else part could probably be just removed).

Björn
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