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

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Date:   Thu, 31 Jan 2019 11:33:24 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     "Reshetova, Elena" <elena.reshetova@...el.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Anders Roxell <anders.roxell@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH] kcov: convert kcov.refcount to refcount_t

On Thu, Jan 31, 2019 at 11:09 AM Reshetova, Elena
<elena.reshetova@...el.com> wrote:
>
> > On Thu, Jan 31, 2019 at 11:04 AM Reshetova, Elena
> > <elena.reshetova@...el.com> wrote:
> > >
> > >  > Just to check, has this been tested with CONFIG_REFCOUNT_FULL and
> > > > > something poking kcov?
> > > > >
> > > > > Given lib/refcount.c is instrumented, the refcount_*() calls will
> > > > > recurse back into the kcov code. It looks like that's fine, given these
> > > > > are only manipulated in setup/teardown paths, but it would be nice to be
> > > > > sure.
> > > >
> > > > A simple program using KCOV is available here:
> > > > https://elixir.bootlin.com/linux/v5.0-rc3/source/Documentation/dev-
> > > > tools/kcov.rst#L42
> > > > or here (it's like strace but collects and prints KCOV coverage):
> > > > https://github.com/google/syzkaller/blob/master/tools/kcovtrace/kcovtrace.c
> > > >
> > >
> > > Ok, so I finally got to compile kcov in and try the first test program
> > > and it works fine as far as I can see: runs, prints results, and no WARNs anywhere
> > > visible with regards to refcount_t.
> > >
> > > I did my test on 4.20 with CONFIG_REFCOUNT_FULL=y
> > > since I have serious issues getting 5.0 running as it is even from
> > > the stable branch, but unless kcov underwent some serious changes since
> > December,
> > > it should not affect.
> >
> > There were no changes that should affect this part.
> >
> > Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
>
>
> Thank you! Will you be able to take this change forward as for
> other normal kcov changes?

Andrew, please take this patch to mm tree.

+linux-mm mailing list for proper mm patch tracking
I am not a maintainer, all other KCOV patches went through mm tree.