linux-kernel - Re: [-mm patch] make types.h usable for non-gcc C parsers

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Message-ID: <20070828084315.GB27022@uranus.ravnborg.org>
Date:	Tue, 28 Aug 2007 10:43:15 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Adrian Bunk <bunk@...nel.org>,
	Gabriel C <nix.or.die@...glemail.com>,
	linux-kernel@...r.kernel.org, Olaf Hering <olh@...e.de>,
	netdev@...r.kernel.org
Subject: Re: [-mm patch] make types.h usable for non-gcc C parsers

On Tue, Aug 28, 2007 at 12:37:04AM -0700, Andrew Morton wrote:
> On Mon, 27 Aug 2007 23:27:43 +0200 Adrian Bunk <bunk@...nel.org> wrote:
> 
> > On Wed, Aug 22, 2007 at 03:33:27PM +0200, Gabriel C wrote:
> > >...
> > > WARNING: "div64_64" [net/netfilter/xt_connbytes.ko] has no CRC!
> > >...
> > 
> > Patch below.
> > 
> > > Regards,
> > > 
> > > Gabriel
> > 
> > cu
> > Adrian
> > 
> > 
> > <--  snip  -->
> > 
> > 
> > This patch makes the 64bit integers on 32bit architectures usable for
> > all C parsers that know about "long long".
> > 
> > Signed-off-by: Adrian Bunk <bunk@...nel.org>
> > 
> 
> Given that this patch (hopefully) fixes a problem in the current net-2.6.24
> tree, I'm inclined to slip it into mainline immediately.
> 
> But I'd like a better description, please.  Which "non-gcc parser" are we
> talking about here?  Something under ./scripts/.  Well, please identify it,
> and describe what the problem is, and how the proposed patch will address
> it.
> 
> Let's cc Sam too, as I guess he's the guy whose code just broke.

If my analysis is correct then genksyms fails to produce a CRC for div64_64 because
genksyms does not know the __extension__ keyword.
And this patch just paper over the real bug wich is in genksyms - right?

So we should fix the root cause here.

Googeling I did not find a good description of where __extension__ can be
used so I fail to see where in the parse.y file I shal add the keyword.
I think __extension__ may be used both as a part of an expression AND
as part of a typedef (as in this case) but I wonder if this is where it is limited
to be used.
I would like to have this sorted out so we do not do a half-backed solution,
and the proposed patch as it just paper over the real bug is no good.

	Sam
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