linux-kernel - Re: [PATCH] x86-64: re-use kernel/syscall_table

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Message-Id: <4DB85A4F020000780003E6F7@vpn.id2.novell.com>
Date:	Wed, 27 Apr 2011 17:02:55 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	<mingo@...e.hu>, <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86-64: re-use kernel/syscall_table_32.S in
	 ia32/ia32entry.S

>>> On 27.04.11 at 17:41, "H. Peter Anvin" <hpa@...or.com> wrote:
> On 04/27/2011 08:33 AM, Jan Beulich wrote:
>> This requires a little bit of renaming, and a (much shorter than the
>> original full table) set of #define-s for those table entries where
>> native and compat mode entries differ.
>> 
>> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> 
> Hm... not 100% sure I think this is an improvement, partly because it
> creates "action at a distance" -- you now have to look in two separate
> places to find out what actually happens with a system call -- and
> because the i386 table is already a bit of an "odd man out".  I would
> much rather like to see a setup where you have __SYSCALL() macros in
> unistd_64.h-style and perhaps augment it with a 3-operand __SYSCALL()
> macro for the case where compat and non-compat are different.
> 
> What do you think?

Yes, that's certainly an alternative.

Jan

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