diff mbox series

[06/10] locking/powerpc: Wire up local_try_cmpxchg

Message ID 20230305205628.27385-7-ubizjak@gmail.com (mailing list archive)
State Superseded
Headers show
Series locking: Introduce local{,64}_try_cmpxchg | expand

Commit Message

Uros Bizjak March 5, 2023, 8:56 p.m. UTC 
Implement target specific support for local_try_cmpxchg.

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
---
 arch/powerpc/include/asm/local.h | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
index bc4bd19b7fc2..45492fb5bf22 100644
--- a/arch/powerpc/include/asm/local.h
+++ b/arch/powerpc/include/asm/local.h
@@ -90,6 +90,17 @@  static __inline__ long local_cmpxchg(local_t *l, long o, long n)
 	return t;
 }
 
+static __inline__ bool local_try_cmpxchg(local_t *l, long *po, long n)
+{
+	long o = *po, r;
+
+	r = local_cmpxchg(l, o, n);
+	if (unlikely(r != o))
+		*po = r;
+
+	return likely(r == o);
+}
+
 static __inline__ long local_xchg(local_t *l, long n)
 {
 	long t;