linux-kernel - Re: [PATCH v3 5/6] x86/ftrace: Use text

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Message-ID: <20191011125903.GN2359@hirez.programming.kicks-ass.net>
Date:   Fri, 11 Oct 2019 14:59:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mhiramat@...nel.org,
        bristot@...hat.com, jbaron@...mai.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        mingo@...nel.org, namit@...are.com, hpa@...or.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, jpoimboe@...hat.com, jeyu@...nel.org
Subject: Re: [PATCH v3 5/6] x86/ftrace: Use text_poke()

On Thu, Oct 10, 2019 at 07:28:19PM +0200, Peter Zijlstra wrote:

> Really the best solution is to move all the poking into
> ftrace_module_init(), before we mark it RO+X. That's what I'm going to
> do for jump_label and static_call as well, I just need to add that extra
> notifier callback.

OK, so I started writing that patch... or rather, I wrote the patch and
started on the Changelog when I ran into trouble describing why we need
it.

That is, I'm struggling to explain why we cannot flip
prepare_coming_module() and complete_formation().

Yes, it breaks ftrace, but I'm thinking that is all it breaks. So let me
see if we can cure that.