Re: [v5][PATCH] livepatch/ppc: Enable livepatching on powerpc

From: Torsten Duwe
Date: Wed Mar 09 2016 - 12:26:42 EST

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.