linux-kernel - [PATCH 09/12] drivers/hv: Employ atomic_fetch

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Date:	Mon, 20 Jun 2016 13:06:01 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	peterz@...radead.org, mingo@...nel.org
Cc:	davem@...emloft.net, cw00.choi@...sung.com,
	dougthompson@...ssion.com, bp@...en8.de, mchehab@....samsung.com,
	gregkh@...uxfoundation.org, pfg@....com, jikos@...nel.org,
	hans.verkuil@...co.com, awalls@...metrocast.net,
	dledford@...hat.com, sean.hefty@...el.com, kys@...rosoft.com,
	heiko.carstens@...ibm.com, James.Bottomley@...senPartnership.com,
	sumit.semwal@...aro.org, schwidefsky@...ibm.com,
	linux-kernel@...r.kernel.org, dave@...olabs.net,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 09/12] drivers/hv: Employ atomic_fetch_inc()

Now that we have fetch_inc() we can stop using inc_return() - 1.

These are very similar to the existing OP-RETURN primitives we already
have, except they return the value of the atomic variable _before_
modification.

Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
Cc: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 drivers/hv/channel.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 56dd261f7142..6f2421a62947 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -397,8 +397,7 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
 	unsigned long flags;
 	int ret = 0;
 
-	next_gpadl_handle =
-		(atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1);
+	next_gpadl_handle = atomic_fetch_inc(&vmbus_connection.next_gpadl_handle);
 
 	ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount);
 	if (ret)
-- 
2.6.6