linux-kernel - Re: [PATCH 08/12] syscalls: add new COMPAT_SYSCALL

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Message-ID: <20100302064000.GA2379@osiris.boeblingen.de.ibm.com>
Date:	Tue, 2 Mar 2010 07:40:00 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	fweisbec@...il.com, mingo@...e.hu, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, laijs@...fujitsu.com,
	lizf@...fujitsu.com, hpa@...or.com, tglx@...utronix.de,
	mhiramat@...hat.com, benh@...nel.crashing.org, davem@...emloft.net,
	lethal@...ux-sh.org, schwidefsky@...ibm.com,
	brueckner@...ux.vnet.ibm.com, tony.luck@...el.com
Subject: Re: [PATCH 08/12] syscalls: add new COMPAT_SYSCALL_DEFINE#N() macro

On Mon, Mar 01, 2010 at 04:05:22PM -0500, Jason Baron wrote:
> On Sun, Feb 28, 2010 at 11:09:02AM +0100, Heiko Carstens wrote:
> > For architectures which select CONFIG_HAVE_SYSCALL_WRAPPERS this adds
> > unnecessary sign extension code to each compat syscall.
> > On the other hand we could get rid partly of the arch specific sign extension
> > code but that would need some other changes before as well.
> > For example this one:
> > 
> > asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
> >                 struct timezone __user *tz)
> > 
> > should be converted to a function which takes two compat_uptr_t's and let
> > the syscall code itself do the proper pointer conversion (compat_ptr()).
> > 
> > Besides that the syscall alias names for these compat calls do look a
> > bit strange:
> > 
> > 000000000008b57c T SyScompat_sys_adjtimex
> > 000000000008b57c T compat_sys_adjtimex
> > 
> > That needs to be fixed as well.
> > Or simply add a 1:1 wrapper independent of CONFIG_HAVE_SYSCALL_WRAPPERS.
> 
> ok, the later suggestion seems simpler. Below I've re-spun patch #6 and
> #8. how do they look?

Looks good to me! :)
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