x86: fix xchg() and cmpxchg() macros

Change-Id: I6faf0fff8a8595734fca6247634cdae6b86483b3
2019-04-02 23:05:53 +09:00
parent 9b6a88eeeb
commit 0d902872a1
2 changed files with 119 additions and 35 deletions
--- a/arch/x86_64/kernel/include/arch/cpu.h
+++ b/arch/x86_64/kernel/include/arch/cpu.h
@@ -34,4 +34,12 @@ static inline unsigned long read_tsc(void)
 	return (low | ((unsigned long)high << 32));
 }

+#define smp_load_acquire(p)						\
+({									\
+	typeof(*p) ___p1 = ACCESS_ONCE(*p);				\
+	compiletime_assert_atomic_type(*p);				\
+	barrier();							\
+	___p1;								\
+})
+
 #endif /* ARCH_CPU_H */