linux-kernel - [tip: locking/core] futex: Use atomic64_inc_return() in get_inode_sequence

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Message-ID: <172919585166.1442.17461368757454570969.tip-bot2@tip-bot2>
Date: Thu, 17 Oct 2024 20:10:51 -0000
From: "tip-bot2 for Uros Bizjak" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
 andrealmeid@...lia.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: locking/core] futex: Use atomic64_inc_return() in
 get_inode_sequence_number()

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     19298f48694987fac843261c84e24834c255b451
Gitweb:        https://git.kernel.org/tip/19298f48694987fac843261c84e24834c255b451
Author:        Uros Bizjak <ubizjak@...il.com>
AuthorDate:    Thu, 10 Oct 2024 09:10:04 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 17 Oct 2024 22:02:27 +02:00

futex: Use atomic64_inc_return() in get_inode_sequence_number()

Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref)
to use optimized implementation and ease register pressure around
the primitive for targets that implement optimized variant.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: André Almeida <andrealmeid@...lia.com>
Link: https://lore.kernel.org/all/20241010071023.21913-1-ubizjak@gmail.com

---
 kernel/futex/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 136768a..3146730 100644
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c
@@ -181,7 +181,7 @@ static u64 get_inode_sequence_number(struct inode *inode)
 		return old;
 
 	for (;;) {
-		u64 new = atomic64_add_return(1, &i_seq);
+		u64 new = atomic64_inc_return(&i_seq);
 		if (WARN_ON_ONCE(!new))
 			continue;