Re: [PATCHv2] refcount: always allow checked forms

[Will Deacon]

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@xxxxxxx>
> Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
> Reviewed-by: David Sterba <dsterba@xxxxxxxx>
> Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Will Deacon <will.deacon@xxxxxxx>
> ---
>  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@xxxxxxx>

Will