linux-kernel - Re: warning: calling ‘__builtin_return_address’ with a nonzero argument is unsafe

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Message-ID: <20160728124225.onhozrbb6bn7iwa2@treble>
Date:	Thu, 28 Jul 2016 07:42:25 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: warning: calling ‘__builtin_return_address’ with a nonzero
 argument is unsafe

On Wed, Jul 27, 2016 at 08:21:50PM -0700, Linus Torvalds wrote:
> The remaining ones are mostly objtool warnings (Josh added to cc: I
> get both a "objtool: x86 instruction decoder differs from kernel"
> warning

Ok, this should be an easy fix.

> and several new "sibling call from callable instruction with
> changed frame pointer" warnings).

These all seem to be caused by a new switch statement optimization in
gcc 6 which objtool doesn't know about yet.  I'll try to come up with a
patch to fix it soon.

-- 
Josh