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s390/qdio: replace shift loop by ilog2 

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: Joe Perches <joe@perches.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Fabian Frederick 2014-06-03 21:55:15 +02:00 committed by Martin Schwidefsky
parent dbe33fc9ad
commit 92bdae5d9c
1 changed files with 3 additions and 4 deletions
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7
drivers/s390/cio/qdio_main.c
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@ -409,17 +409,16 @@ static inline void qdio_stop_polling(struct qdio_q *q)
set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
}
static inline void account_sbals(struct qdio_q *q, int count)
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]++;
}