linux-kernel - Re: [PATCH] Complain about missing system calls.

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Message-ID: <p737itqbdnl.fsf@bingen.suse.de>
Date:	09 Mar 2007 17:11:10 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, rmk@....linux.org.uk, sam@...nborg.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] Complain about missing system calls.

David Woodhouse <dwmw2@...radead.org> writes:

> Most system calls seem to get added to i386 first. This patch
> automatically generates a warning for any new system call which is
> implemented on i386 but not the architecture currently being compiled.
> On PowerPC at the moment, for example, it results in these warnings:
> init/missing_syscalls.h:935:3: warning: #warning syscall sync_file_range not implemented
> init/missing_syscalls.h:947:3: warning: #warning syscall getcpu not implemented
> init/missing_syscalls.h:950:3: warning: #warning syscall epoll_pwait not implemented

I think a better solution would be to finally switch to auto generated
system call tables for newer system calls. The original reason why the
architectures have different system call numbers -- compatibility with
another "native" Unix -- is completely obsolete now. This leaves only
minor differences of compat stub vs non compat stub and a few
architecture specific calls.

Of course the existing syscall numbers can't be changed, but for all new 
calls one could just add automatically for everybody.

A global table with two entries (compat and non compat) and a per arch 
override table should be sufficient.

Comments?

-Andi
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