linux-kernel - Re: [GIT PULL] headers

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Date:	Sun, 7 Jun 2009 09:09:04 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Catalin Marinas <catalin.marinas@....com>,
	Tony Luck <tony.luck@...el.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Greg Ungerer <gerg@...pgear.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Abbott <michael@...neidae.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [GIT PULL] headers_check fixes

On Sun, Jun 07, 2009 at 12:24:15AM +0100, Russell King wrote:
> On Sun, Jun 07, 2009 at 12:12:23AM +0200, Sam Ravnborg wrote:
> > Hi Russell.
> > 
> > On Sat, Jun 06, 2009 at 10:47:11PM +0100, Russell King wrote:
> > > Right, below is a patch to unifdef.c which allows it to work out if
> > > an #if expression always evaluates true or false for symbols which
> > > are being undefined/always defined.
> > > 
> > > The patch is slightly more complicated than I'd hoped because unifdef
> > > needs to see lines fully evaluated - doing otherwise causes it to
> > > mark the line as "dirty" and copy it over no matter what.
> > > 
> > > What follows this email is the diff of what effect it has on the
> > > headers copied over - as can be seen, all resulting changes are of
> > > net benefit.
> > 
> > You beat me on this one.
> > I was looking into supportting short_circuit_and/short_circuit_or too.
> > Your patch looks better - thanks!
> > 
> > >From my very limited testing this patch suffers from a problem I faced too.
> > When you run it on for example hwcap.h or my sample file:
> > #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
> >   int a;
> > #endif
> > 
> > then the return code of the program is 1 so we do not copy the file.
> 
> That's correct.  If unifdef removes any lines, the exit code is 1, not
> zero.  This happens with the unmodified unifdef as well, so I'm not
> changing that behaviour.

Thanks.
I was just fooled in my testing.
With the same file I saw two different return codes with and
without the patch. But this is because you fixed unifdef.

	Sam
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