linux-kernel - Re: [PATCH] kcov: convert kcov.refcount to refcount

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Message-ID: <20190125103146.GD4500@hirez.programming.kicks-ass.net>
Date:   Fri, 25 Jan 2019 11:31:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Reshetova, Elena" <elena.reshetova@...el.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Anders Roxell <anders.roxell@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kcov: convert kcov.refcount to refcount_t

On Fri, Jan 25, 2019 at 09:02:42AM +0000, Reshetova, Elena wrote:
> > > I suppose we can add smp_acquire__after_ctrl_dep() on the true branch.
> > > Then it reall does become rel_acq.
> > >
> > > A wee something like so (I couldn't find an arm64 refcount, even though
> > > I have distinct memories of talk about it).
> > 
> > In the end, arm and arm64 chose to use REFCOUNT_FULL unconditionally,
> > so there's no arch-specific implementation.
> > 
> > > This isn't compiled, and obviously needs comment/documentation updates
> > > to go along with it.
> > 
> > Elena, can you do the doc updates?
> 
> Well, doc updates should go with below patch + and additional testing...
> 
> Peter, should I create a full version from below with doc/comments
> updates, run the whole thing via zero day and send to you if it all looks ok?

If you have to time to do so, yes please!