Implement target specific support for local_try_cmpxchg.
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
---
arch/powerpc/include/asm/local.h | 11 +++++++++++
1 file changed, 11 insertions(+)
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;
--
2.39.2
