linux-kernel - Re: [RFC][PATCH 3/2] livepatch: remove klp_check_compiler

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Message-ID: <20190510175402.173e0cf8@gandalf.local.home>
Date:   Fri, 10 May 2019 17:54:02 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        live-patching@...r.kernel.org, x86@...nel.org,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [RFC][PATCH 3/2] livepatch: remove klp_check_compiler_support()

On Fri, 10 May 2019 23:47:50 +0200 (CEST)
Jiri Kosina <jikos@...nel.org> wrote:

> From: Jiri Kosina <jkosina@...e.cz>
> 
> The only purpose of klp_check_compiler_support() is to make sure that we 
> are not using ftrace on x86 via mcount (because that's executed only after 
> prologue has already happened, and that's too late for livepatching 
> purposes).
> 
> Now that mcount is not supported by ftrace any more, there is no need for 
> klp_check_compiler_support() either.
> 
> Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> ---
> 
> I guess it makes most sense to merge this together with mcount removal in 
> one go.

Thanks, I applied it to my queue and will start running it through my
tests.

-- Steve