linux-kernel - Re: [PATCHv2] refcount: always allow checked forms

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Date:   Thu, 12 Jul 2018 23:34:58 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        David Sterba <dsterba@...e.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCHv2] refcount: always allow checked forms


* Kees Cook <keescook@...omium.org> wrote:

> On Thu, Jul 12, 2018 at 10:01 AM, Will Deacon <will.deacon@....com> wrote:
> > On Wed, Jul 11, 2018 at 10:36:07AM +0100, Mark Rutland wrote:
> >> In many cases, it would be useful to be able to use the full
> >> sanity-checked refcount helpers regardless of CONFIG_REFCOUNT_FULL, as
> >> this would help to avoid duplicate warnings where callers try to
> >> sanity-check refcount manipulation.
> >>
> >> This patch refactors things such that the full refcount helpers were
> >> always built, as refcount_${op}_checked(), such that they can be used
> >> regardless of CONFIG_REFCOUNT_FULL. This will allow code which *always*
> >> wants a checked refcount to opt-in, avoiding the need to duplicate the
> >> logic for warnings.
> >>
> >> There should be no functional change as a result of this patch.
> >>
> >> Signed-off-by: Mark Rutland <mark.rutland@....com>
> >> Acked-by: Kees Cook <keescook@...omium.org>
> >> Reviewed-by: David Sterba <dsterba@...e.com>
> >> Cc: Boqun Feng <boqun.feng@...il.com>
> >> Cc: Ingo Molnar <mingo@...nel.org>
> >> Cc: Peter Zijlstra <peterz@...radead.org>
> >> Cc: Will Deacon <will.deacon@....com>
> >> ---
> >>  include/linux/refcount.h | 27 +++++++++++++++++-------
> >>  lib/refcount.c           | 53 +++++++++++++++++++++++-------------------------
> >>  2 files changed, 45 insertions(+), 35 deletions(-)
> >
> > Looks good to me:
> >
> > Acked-by: Will Deacon <will.deacon@....com>
> 
> Peter, Ingo, can this go via the atomics tree? That's been the
> traditional location for the refcount patches.

Sure, will have a look tomorrow!

	Ingo