Date: Wed, 9 Mar 2016 18:26:29 +0100
From: Torsten Duwe <duwe@lst.de>
To: Petr Mladek <pmladek@suse.com>
Cc: jeyu@redhat.com, jkosina@suse.cz, jikos@kernel.org,
        linux-kernel@vger.kernel.org, rostedt@goodmis.org,
        kamalesh@linux.vnet.ibm.com, linuxppc-dev@ozlabs.org,
        live-patching@vger.kernel.org, mbenes@suse.cz
Subject: Re: [v5][PATCH] livepatch/ppc: Enable livepatching on powerpc
Message-ID: <20160309172629.GB27913@lst.de>
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On Wed, Mar 09, 2016 at 05:10:25PM +0100, Petr Mladek wrote:
> On Tue 2016-03-08 16:34:35, Torsten Duwe wrote:
> > /* compile using "-ffixed-r14"! */
> > register unsigned long pass_TOC asm("r14");
> 
> BTW: Is this reentrant, please? I mean, is it possible to use this
> hack for two functions? Could the functions call each other?

Yes, it is. pass_TOC isn't really a global variable. It only lives
between the caller and the real function's return. With this notation
the task can easily be shifted to any other register.

	Torsten