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libfc: Micro-optimize fc_setup_exch_mgr()

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Convert a loop into an ilog2() call. Although this code is not performance
sensitive this conversion makes this code easier to read.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
This commit is contained in:
Bart Van Assche 2013-08-14 15:33:35 +00:00 committed by Robert Love
parent b20d9bfda7
commit a84ea8c7e8
1 changed files with 3 additions and 7 deletions
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10
drivers/scsi/libfc/fc_exch.c
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@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/log2.h>
#include <scsi/fc/fc_fc2.h>
@ -2530,13 +2531,8 @@ int fc_setup_exch_mgr(void)
* cpu on which exchange originated by simple bitwise
* AND operation between fc_cpu_mask and exchange id.
*/
fc_cpu_mask = 1;
fc_cpu_order = 0;
while (fc_cpu_mask < nr_cpu_ids) {
fc_cpu_mask <<= 1;
fc_cpu_order++;
}
fc_cpu_mask--;
fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids));
fc_cpu_mask = (1 << fc_cpu_order) - 1;
fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue");
if (!fc_exch_workqueue)