linux-kernel - Re: [2/5] livepatch: Allow architectures to specify an alternate ftrace location

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Date:	Tue, 19 Apr 2016 20:16:29 +1000 (AEST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Michael Ellerman <mpe@...erman.id.au>, <linuxppc-dev@...abs.org>
Cc:	pmladek@...e.com, jeyu@...hat.com, jikos@...nel.org,
	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	kamalesh@...ux.vnet.ibm.com, duwe@....de,
	live-patching@...r.kernel.org, mbenes@...e.cz
Subject: Re: [2/5] livepatch: Allow architectures to specify an alternate ftrace location

On Wed, 2016-13-04 at 12:53:20 UTC, Michael Ellerman wrote:
> When livepatch tries to patch a function it takes the function address
> and asks ftrace to install the livepatch handler at that location.
> ftrace will look for an mcount call site at that exact address.
> 
> On powerpc the mcount location is not the first instruction of the
> function, and in fact it's not at a constant offset from the start of
> the function. To accommodate this add a hook which arch code can
> override to customise the behaviour.
> 
> Signed-off-by: Torsten Duwe <duwe@...e.de>
> Signed-off-by: Balbir Singh <bsingharora@...il.com>
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/28e7cbd3e0f5fefec892842d13

cheers