linux-kernel - [PATCH v4 28/40] bluetooth: optimize cmtp_alloc_block

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Date: Thu, 20 Jun 2024 10:56:51 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
	Karsten Keil <isdn@...ux-pingi.de>,
	Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	Yury Norov <yury.norov@...il.com>,
	netdev@...r.kernel.org,
	linux-bluetooth@...r.kernel.org
Cc: Alexey Klimov <alexey.klimov@...aro.org>,
	Bart Van Assche <bvanassche@....org>,
	Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Shtylyov <s.shtylyov@....ru>
Subject: [PATCH v4 28/40] bluetooth: optimize cmtp_alloc_block_id()

Instead of polling every bit in blockids, use a dedicated
find_and_set_bit(), and make the function a simple one-liner.

Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 net/bluetooth/cmtp/core.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c
index 90d130588a3e..06732cf2661b 100644
--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -22,6 +22,7 @@
 
 #include <linux/module.h>
 
+#include <linux/find_atomic.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
@@ -88,15 +89,9 @@ static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_connin
 
 static inline int cmtp_alloc_block_id(struct cmtp_session *session)
 {
-	int i, id = -1;
+	int id = find_and_set_bit(&session->blockids, 16);
 
-	for (i = 0; i < 16; i++)
-		if (!test_and_set_bit(i, &session->blockids)) {
-			id = i;
-			break;
-		}
-
-	return id;
+	return id < 16 ? id : -1;
 }
 
 static inline void cmtp_free_block_id(struct cmtp_session *session, int id)
-- 
2.43.0