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

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Message-ID: <20080617101112.GE20169@cs181133002.pp.htv.fi>
Date:	Tue, 17 Jun 2008 13:11:12 +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 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...

> Or maybe, as dhowells suggests, re-defining ARCH_SUPPORTS_AOUT to be set
> only on Alpha, ARM, m68k and x86 (so BINFMT_AOUT can depend on it).

The pattern for this stuff is to provide a HAVE_AOUT kconfig variable 
that gets select'ed by these architectures.

> 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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