Date: Fri, 24 Apr 2015 11:27:30 +0200 (CEST)
From: Jiri Kosina <jkosina@suse.cz>
To: AKASHI Takahiro <takahiro.akashi@linaro.org>
cc: rostedt@goodmis.org, mingo@kernel.org, jpoimboe@redhat.com,
        sjenning@redhat.com, vojtech@suse.cz, catalin.marinas@arm.com,
        will.deacon@arm.com, broonie@kernel.org,
        masami.hiramatsu.pt@hitachi.com, live-patching@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linaro-kernel@lists.linaro.org,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC 0/4] arm64: add livepatch support
In-Reply-To: <1429843449-7388-1-git-send-email-takahiro.akashi@linaro.org>
Message-ID: <alpine.LNX.2.00.1504241126430.3695@pobox.suse.cz>
References: <1429843449-7388-1-git-send-email-takahiro.akashi@linaro.org>
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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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