s390/cmpxchg,percpu: implement cmpxchg_double()
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h
index 964e7ee..86fe0ee 100644
--- a/arch/s390/include/asm/percpu.h
+++ b/arch/s390/include/asm/percpu.h
@@ -67,7 +67,7 @@
#define this_cpu_xor_4(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
#define this_cpu_xor_8(pcp, val) arch_this_cpu_to_op(pcp, val, ^)
-#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
+#define arch_this_cpu_cmpxchg(pcp, oval, nval) \
({ \
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ ret__; \
@@ -108,6 +108,26 @@
#define this_cpu_xchg_8(pcp, nval) arch_this_cpu_xchg(pcp, nval)
#endif
+#define arch_this_cpu_cmpxchg_double(pcp1, pcp2, o1, o2, n1, n2) \
+({ \
+ typeof(pcp1) o1__ = (o1), n1__ = (n1); \
+ typeof(pcp2) o2__ = (o2), n2__ = (n2); \
+ typeof(pcp1) *p1__; \
+ typeof(pcp2) *p2__; \
+ int ret__; \
+ preempt_disable(); \
+ p1__ = __this_cpu_ptr(&(pcp1)); \
+ p2__ = __this_cpu_ptr(&(pcp2)); \
+ ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__); \
+ preempt_enable(); \
+ ret__; \
+})
+
+#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
+#ifdef CONFIG_64BIT
+#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
+#endif
+
#include <asm-generic/percpu.h>
#endif /* __ARCH_S390_PERCPU__ */