locking/local, arch: Rewrite local_add_unless() as a static inline function

Rewrite local_add_unless() as a static inline function with boolean
return value, similar to the arch_atomic_add_unless() arch fallbacks.

The function is currently unused.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230731084458.28096-1-ubizjak@gmail.com

1 files changed, 16 insertions, 11 deletions

diff --git a/arch/loongarch/include/asm/local.h b/arch/loongarch/include/asm/local.h
index c49675852bdc..f53ea653af76 100644
--- a/arch/loongarch/include/asm/local.h
+++ b/arch/loongarch/include/asm/local.h
@@ -70,22 +70,27 @@ static inline bool local_try_cmpxchg(local_t *l, long *old, long new)
 #define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
 
 /**
- * local_add_unless - add unless the number is a given value
+ * local_add_unless - add unless the number is already a given value
  * @l: pointer of type local_t
  * @a: the amount to add to l...
  * @u: ...unless l is equal to u.
  *
- * Atomically adds @a to @l, so long as it was not @u.
- * Returns non-zero if @l was not @u, and zero otherwise.
+ * Atomically adds @a to @l, if @v was not already @u.
+ * Returns true if the addition was done.
  */
-#define local_add_unless(l, a, u)				\
-({								\
-	long c, old;						\
-	c = local_read(l);					\
-	while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
-		c = old;					\
-	c != (u);						\
-})
+static inline bool
+local_add_unless(local_t *l, long a, long u)
+{
+	long c = local_read(l);
+
+	do {
+		if (unlikely(c == u))
+			return false;
+	} while (!local_try_cmpxchg(l, &c, c + a));
+
+	return true;
+}
+
 #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
 
 #define local_dec_return(l) local_sub_return(1, (l))