linux-kernel - Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le (ABIv2)

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Date:	Tue, 2 Feb 2016 21:39:21 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Petr Mladek <pmladek@...e.com>
cc:	Torsten Duwe <duwe@....de>, Miroslav Benes <mbenes@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michael Ellerman <mpe@...erman.id.au>, anton@...ba.org,
	linuxppc-dev@...ts.ozlabs.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	live-patching@...r.kernel.org
Subject: Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le
 (ABIv2)

On Tue, 2 Feb 2016, Petr Mladek wrote:

> Note that TOC is not set only when the problematic functions are 
> compiled with --mprofile-kernel. I still see the TOC stuff when 
> compiling only with -pg.

I don't see how this wouldn't be a gcc bug.

No matter whether it's plain profiling call (-pg) or kernel profiling call 
(-mprofile-kernel), gcc must always assume that global function (that will 
typically have just one instance for the whole address space) will be 
called.

-- 
Jiri Kosina
SUSE Labs