From: Uros Bizjak <ubizjak@gmail.com>
Date: Thu, 10 Oct 2024 07:10:04 +0000 (+0200)
Subject: futex: Use atomic64_inc_return() in get_inode_sequence_number()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=19298f48694987fac843261c84e24834c255b451;p=users%2Fjedix%2Flinux-maple.git

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

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 136768ae26375..3146730e55f75 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;