linux-kernel - [PATCH 18/54] drivers/infiniband: replace cpumask_weight with cpumask

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Date:   Sun, 23 Jan 2022 10:38:49 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        David Laight <David.Laight@...lab.com>,
        Joe Perches <joe@...ches.com>, Dennis Zhou <dennis@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Nicholas Piggin <npiggin@...il.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Alexey Klimov <aklimov@...hat.com>,
        linux-kernel@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org
Subject: [PATCH 18/54] drivers/infiniband: replace cpumask_weight with cpumask_empty where appropriate

drivers/infiniband/hw/hfi1/affinity.c code calls cpumask_weight() to check
if any bit of a given cpumask is set. We can do it more efficiently with
cpumask_empty() because cpumask_empty() stops traversing the cpumask as
soon as it finds first set bit, while cpumask_weight() counts all bits
unconditionally.

Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 drivers/infiniband/hw/hfi1/affinity.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/affinity.c b/drivers/infiniband/hw/hfi1/affinity.c
index 98c813ba4304..38eee675369a 100644
--- a/drivers/infiniband/hw/hfi1/affinity.c
+++ b/drivers/infiniband/hw/hfi1/affinity.c
@@ -667,7 +667,7 @@ int hfi1_dev_affinity_init(struct hfi1_devdata *dd)
 			 * engines, use the same CPU cores as general/control
 			 * context.
 			 */
-			if (cpumask_weight(&entry->def_intr.mask) == 0)
+			if (cpumask_empty(&entry->def_intr.mask))
 				cpumask_copy(&entry->def_intr.mask,
 					     &entry->general_intr_mask);
 		}
@@ -687,7 +687,7 @@ int hfi1_dev_affinity_init(struct hfi1_devdata *dd)
 		 * vectors, use the same CPU core as the general/control
 		 * context.
 		 */
-		if (cpumask_weight(&entry->comp_vect_mask) == 0)
+		if (cpumask_empty(&entry->comp_vect_mask))
 			cpumask_copy(&entry->comp_vect_mask,
 				     &entry->general_intr_mask);
 	}
-- 
2.30.2