linux-kernel - Re: [PATCH 1/3] jump_label: Warn on failed jump

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Message-ID: <20180214211707.hivwfwemghgy62mh@treble>
Date:   Wed, 14 Feb 2018 15:17:07 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Jason Baron <jbaron@...mai.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>, Juergen Gross <jgross@...e.com>,
        Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 1/3] jump_label: Warn on failed jump_label patch

On Wed, Feb 14, 2018 at 12:40:34PM -0500, Steven Rostedt wrote:
> On Wed, 14 Feb 2018 11:34:07 -0600
> Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> 
> 
> > And in patch 1 the warning conditions need to be tweaked a bit to
> > exclude the __init case.
> > 
> 
> Hmm, I wonder if we could simply remove the references from the jump
> label table when init is freed.

Interesting idea.  The static key's entries (i.e. tracepoint sites) are
in a static array.  Maybe we could rewrite the affected arrays when init
memory is freed.  I'm not sure whether that would be overkill though.  I
can tinker with it and see how it compares to the current solution.

-- 
Josh