Re: [PATCH V2 2/2] drivers/s390/cio/qdio_main.c: replace shift loop by ilog2

From: Sebastian Ott
Date: Wed Jun 04 2014 - 10:21:13 EST


On Tue, 3 Jun 2014, Fabian Frederick wrote:
> account_sbals is called by get_inbound_buffer_frontier and
> get_outbound_buffer_frontier with 'count' value > 0 so we can safely convert
> shift loop to ilog2.
>
> Cc: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
> Cc: Joe Perches <joe@xxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
> ---
> drivers/s390/cio/qdio_main.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
> index 9fda160..2eee7f1 100644
> --- a/drivers/s390/cio/qdio_main.c
> +++ b/drivers/s390/cio/qdio_main.c
> @@ -413,15 +413,14 @@ static inline void qdio_stop_polling(struct qdio_q *q)
>
> static inline void account_sbals(struct qdio_q *q, unsigned int count)
> {
> - int pos = 0;
> + int pos;
>
> q->q_stats.nr_sbal_total += count;
> if (count == QDIO_MAX_BUFFERS_MASK) {
> q->q_stats.nr_sbals[7]++;
> return;
> }
> - while (count >>= 1)
> - pos++;
> + pos = ilog2(count);
> q->q_stats.nr_sbals[pos]++;
> }
>
> --
> 1.8.4.5
>
>

Thanks, applied.
Sebastian

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/