linux-kernel - Re: [PATCH] objtool: Disable stack validation when CROSS

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Message-ID: <20160302132735.37262b34@canb.auug.org.au>
Date:	Wed, 2 Mar 2016 13:27:35 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] objtool: Disable stack validation when CROSS_COMPILE is
 used

Hi Josh,

On Tue, 1 Mar 2016 15:54:51 -0600 Josh Poimboeuf <jpoimboe@...hat.com> wrote:
>
> Changing it to use the host compiler would probably be an easy fix, but
> that would expose a harder bug related to endianness.

Just by luck, my PowerPC host is little endian :-)

> How about the below workaround patch to disable objtool and warn when
> CROSS_COMPILE is used?  If anybody complains about lack of cross-compile
> support later, we could try to fix it then.

This seems reasonable.

> From a3c65947011a420743f308b698171c4209105d3f Mon Sep 17 00:00:00 2001
> Message-Id: <a3c65947011a420743f308b698171c4209105d3f.1456868910.git.jpoimboe@...hat.com>
> From: Josh Poimboeuf <jpoimboe@...hat.com>
> Date: Tue, 1 Mar 2016 13:35:51 -0600
> Subject: [PATCH] objtool: Disable stack validation when CROSS_COMPILE is used

I have applied this to the merge of the tip tree in linux-next today
and it compiles fine for me.  I will continue applying it until
something better comes along or it is applied to the tip tree.

Thanks for that.
-- 
Cheers,
Stephen Rothwell