linux-kernel - Re: architectures with ARCH_SUPPORTS_AOUT but no binfmt

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Message-ID: <20080617102415.GA30239@cs181133002.pp.htv.fi>
Date:	Tue, 17 Jun 2008 13:24:15 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Peter Korsgaard <jacmet@...site.dk>, linux-kernel@...r.kernel.org,
	sam@...nborg.org, dhowells@...hat.com, andi@...stfloor.org,
	"Kirill A. Shutemov" <k.shutemov@...il.com>,
	ysato@...rs.sourceforge.jp, takata@...ux-m32r.org,
	linux-m32r@...linux-m32r.org, kyle@...artin.ca, matthew@....cx,
	grundler@...isc-linux.org, linux-parisc@...r.kernel.org,
	lethal@...ux-sh.org, linux-sh@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: architectures with ARCH_SUPPORTS_AOUT but no binfmt_aout

On Tue, Jun 17, 2008 at 11:18:45AM +0100, David Woodhouse wrote:
> On Tue, 2008-06-17 at 13:11 +0300, Adrian Bunk wrote:
> > On Tue, Jun 17, 2008 at 10:46:44AM +0100, David Woodhouse wrote:
> > > On Tue, 2008-06-17 at 11:42 +0300, Adrian Bunk wrote:
> > > > 
> > > > > Why _are_ there architectures which define ARCH_SUPPORTS_AOUT and have
> > > > > <asm/a.out.h> but don't support binfmt_aout, anyway? How does that make
> > > > > sense?
> > > > 
> > > > My guess would be that binfmt_aout isn't actually used there.
> > > > 
> > > > The affected architectures are:
> > > > - h8300
> > > > - m32r
> > > > - parisc
> > > > - sh
> > > > - v850
> > > > 
> > > > v850 is broken beyond repair, and I hope my patch to remove the 
> > > > architecture will make it into 2.6.27.
> > > > 
> > > > For the other 4 architectures I have Cc'ed the architecture maintainers.
> > > 
> > > There's another set of architectures which have <asm/a.out.h> but don't
> > > define ARCH_SUPPORTS_AOUT. Including PowerPC.
> > > 
> > > I think we can probably get away with removing <asm/a.out.h> from every
> > > architecture other than Alpha, ARM, m68k and x86, and killing
> > > ARCH_SUPPORTS_AOUT completely.
> > 
> > include/linux/a.out.h contains an #include <asm/a.out.h> and is exported 
> > to userspace...
> 
> Actually, it isn't -- but it _should_ be. But we can do it conditionally.
> See http://git.infradead.org/users/dwmw2/aout-2.6.git?a=commitdiff;h=5939c6a41
>...

It's already in Linus' tree.

Sorry, you are right, I missed that it takes care of exporting 
linux/a.out.h only when asm/a.out.h exists.

> dwmw2

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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