3 files changed, 7 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index fa395179ddd6..6ca5d5cabeb1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -139,6 +139,7 @@ config PPC
         select OLD_SIGACTION if PPC32
         select HAVE_DEBUG_STACKOVERFLOW
         select HAVE_IRQ_EXIT_ON_IRQ_STACK
+        select ARCH_USE_CMPXCHG_LOCKREF if PPC64
 
 config GENERIC_CSUM
         def_bool CPU_LITTLE_ENDIAN
diff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h
index e245aab7f191..d463c68fe7f0 100644
--- a/arch/powerpc/include/asm/cmpxchg.h
+++ b/arch/powerpc/include/asm/cmpxchg.h
@@ -300,6 +300,7 @@ __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
         cmpxchg_local((ptr), (o), (n));                                 \
   })
+#define cmpxchg64_relaxed       cmpxchg64_local
 #else
 #include <asm-generic/cmpxchg-local.h>
 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h
index 5f54a744dcc5..5162f8cd18c0 100644
--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h
@@ -54,6 +54,11 @@
 #define SYNC_IO
 #endif
 
+static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock)
+{
+        return lock.slock == 0;
+}
+
 /*
  * This returns the old value in the lock, so we succeeded
  * in getting the lock if the return value is 0.