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

From: Jiri Kosina
Date: Fri Apr 24 2015 - 05:27:38 EST

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?


Jiri Kosina
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