linux-kernel - [PATCH] RDMA/hfi1: Switch to kvfree

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Message-Id: <20211215111845.2514-8-urezki@gmail.com>
Date:   Wed, 15 Dec 2021 12:18:44 +0100
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Cc:     Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Axtens <dja@...ens.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
Subject: [PATCH] RDMA/hfi1: Switch to kvfree_rcu() API

Instead of invoking a synchronize_rcu() to free a pointer
after a grace period we can directly make use of new API
that does the same but in more efficient way.

TO: linux-rdma@...r.kernel.org
TO: Jason Gunthorpe <jgg@...dia.com>
TO: Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
Acked-by: Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 drivers/infiniband/hw/hfi1/sdma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/sdma.c b/drivers/infiniband/hw/hfi1/sdma.c
index f07d328689d3..7264a35e8f4c 100644
--- a/drivers/infiniband/hw/hfi1/sdma.c
+++ b/drivers/infiniband/hw/hfi1/sdma.c
@@ -1292,8 +1292,7 @@ void sdma_clean(struct hfi1_devdata *dd, size_t num_engines)
 	sdma_map_free(rcu_access_pointer(dd->sdma_map));
 	RCU_INIT_POINTER(dd->sdma_map, NULL);
 	spin_unlock_irq(&dd->sde_map_lock);
-	synchronize_rcu();
-	kfree(dd->per_sdma);
+	kvfree_rcu(dd->per_sdma);
 	dd->per_sdma = NULL;
 
 	if (dd->sdma_rht) {
-- 
2.30.2