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>

1 files changed, 21 insertions, 1 deletions

diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h
index 964e7ee872f..86fe0ee2cee 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__ */