linux-kernel - Re: [PATCH -tip -v12 02/11] x86: x86 instruction decoder build-time selftest

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Message-ID: <20090716195542.GA5994@merkur.ravnborg.org>
Date:	Thu, 16 Jul 2009 21:55:42 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Avi Kivity <avi@...hat.com>,
	Przemys??awPawe??czyk <przemyslaw@...elczyk.it>
Subject: Re: [PATCH -tip -v12 02/11] x86: x86 instruction decoder build-time
	selftest

> >> +      cmd_posttest = objdump -d $(objtree)/vmlinux | awk -f $(srctree)/arch/x86/scripts/distill.awk | $(obj)/test_get_len
> >> +
> > 
> > You are using the native objdump here.
> > But I assume this fails miserably when you build x86 on a powerpc host.
> > In other words - you broke an allyesconfig build for -next...
> > We have $(OBJDUMP) for this.
> 
> Ah, I see... Would you know actual name of x86-objdump on the powerpc
> (or any other crosscompiling host)? I just set "OBJDUMP=objdump" is OK?
> I'm not so sure about cross-compiling kernel...

Replacing objdump with $(OBJDUMP) will do the trick.
We set OBJDUMP to the correct value in the top-level makefile.

Are there any parts of your user-space program that rely
on the host is little-endian?
If it does then it would fail on a power-pc target despite using the
correct objdump.

	Sam
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