libfc: Micro-optimize fc_setup_exch_mgr()

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / scsi / libfc / fc_exch.c

diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index cb2b900..d0be52a 100644 (file)
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -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)