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

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Message-ID: <20180712170124.GD26935@arm.com>
Date:   Thu, 12 Jul 2018 18:01:25 +0100
From:   Will Deacon <will.deacon@....com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org, dsterba@...e.com,
        keescook@...omium.org, boqun.feng@...il.com, mingo@...nel.org,
        peterz@...radead.org
Subject: Re: [PATCHv2] refcount: always allow checked forms

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>

Will