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

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Message-ID: <20070309163805.GV18564@lug-owl.de>
Date:	Fri, 9 Mar 2007 17:38:05 +0100
From:	Jan-Benedict Glaw <jbglaw@...-owl.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	David Woodhouse <dwmw2@...radead.org>, 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.

On Fri, 2007-03-09 17:11:10 +0100, Andi Kleen <andi@...stfloor.org> wrote:
> 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.

Not everybody has a simple indexed list of pointers :)  For example,
for vax-linux, we use a struct per syscall with the expected number of
on-stack longwords for the call.

So if something "new" is coming up, please keep in mind that it should
be flexible enough to represent that. :)

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@...-owl.de              +49-172-7608481
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