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Date: Wed, 31 Dec 2014 04:23:54 -0500
From: Mike Frysinger <vapier@gentoo.org>
To: Benno Schulenberg <bensberg@justemail.net>
Cc: Util-Linux <util-linux@vger.kernel.org>
Subject: Re: setarch cannot set all listed architectures
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On 31 Dec 2014 10:15, Benno Schulenberg wrote:
> On Wed, Dec 31, 2014, at 09:30, Mike Frysinger wrote:
> > On 24 Dec 2014 17:35, Benno Schulenberg wrote:
> > > The man page of setarch says for the option --list: "List the archite=
ctures
> > > that can be set."  However...
> > >=20
> > > $ ./setarch --list  =20
> > > [...]
> > > i686
> > > athlon
> > > x86_64
> > > ia64
> > >=20
> > > $ ./setarch x86_64 uname -m
> > > setarch: x86_64: Unrecognized architecture
> > >=20
> > > [...]
> > >=20
> > > Maybe --list should not be listing x86_64 and ia64 on this machine?
> > > Or maybe the error message in these cases should say "Cannot set
> > > the requested architecture" instead?
> >=20
> > are you running a 32bit or 64bit kernel ?  is your compiled setarch 32b=
it or=20
> > 64bit ?  i'm going to guess both are 32bit.
>=20
> You guessed correctly.  :)
>=20
> $ getconf LONG_BIT
> 32
>=20
> $ grep " lm" /proc/cpuinfo || echo no
> no
>=20
> $ file ./setarch=20
> ./setarch: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dyna=
mically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=3D0x=
830fc9635dbe83defa4db7b0b5db241093d4c86d, not stripped
>=20
> So... setarch --list shouldn't be mentioning x86_64 nor ia64 here?

maybe, but is it really worth the effort ?

if you took that exact 32bit binary and booted a 64bit kernel, i imagine it=
'd=20
work fine.
-mike

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