linux-kernel - Re: [RFC 0/4] arm64: add livepatch support

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Message-ID: <alpine.LNX.2.00.1504241126430.3695@pobox.suse.cz>
Date:	Fri, 24 Apr 2015 11:27:30 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
cc:	rostedt@...dmis.org, mingo@...nel.org, jpoimboe@...hat.com,
	sjenning@...hat.com, vojtech@...e.cz, catalin.marinas@....com,
	will.deacon@....com, broonie@...nel.org,
	masami.hiramatsu.pt@...achi.com, live-patching@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/4] arm64: add livepatch support

On Fri, 24 Apr 2015, AKASHI Takahiro wrote:

> This patchset enables livepatch support on arm64.
> 
> Livepatch was merged in v4.0, and allows replacying a function dynamically
> based on ftrace framework, but it also requires -mfentry option of gcc.
> Currently arm64 gcc doesn't support it, but by adding a helper function to
> ftrace, we will be able to support livepatch on arch's which don't support
> this option.
> 
> I submit this patchset as RFC since I'm not quite sure that I'm doing
> in the right way, or we should definitely support -fentry instead.

I don't have arm64 cross-compiler handy, could you please copy/paste how 
does function prologue, generated by gcc -pg on arm64 look like?

Thanks,

-- 
Jiri Kosina
SUSE Labs
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