[S390] cmpxchg: implement cmpxchg64() (54eaae30) · Commits · 戴 / test

arch/s390/include/asm/cmpxchg.h

+29 −9

Original line number	Diff line number	Diff line
		@@ -164,6 +164,33 @@ static inline unsigned long __cmpxchg(void *ptr, unsigned long old,
		((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
		(unsigned long)(n), sizeof(*(ptr))))

		#ifdef CONFIG_64BIT
		#define cmpxchg64(ptr, o, n) \
		({ \
		BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
		cmpxchg((ptr), (o), (n)); \
		})
		#else /* CONFIG_64BIT */
		static inline unsigned long long __cmpxchg64(void *ptr,
		unsigned long long old,
		unsigned long long new)
		{
		register_pair rp_old = {.pair = old};
		register_pair rp_new = {.pair = new};

		asm volatile(
		" cds %0,%2,%1"
		: "+&d" (rp_old), "=Q" (ptr)
		: "d" (rp_new), "Q" (ptr)
		: "cc");
		return rp_old.pair;
		}
		#define cmpxchg64(ptr, o, n) \
		((__typeof__(*(ptr)))__cmpxchg64((ptr), \
		(unsigned long long)(o), \
		(unsigned long long)(n)))
		#endif /* CONFIG_64BIT */

		#include <asm-generic/cmpxchg-local.h>

		static inline unsigned long __cmpxchg_local(void *ptr,
		@@ -192,14 +219,7 @@ static inline unsigned long __cmpxchg_local(void *ptr,
		#define cmpxchg_local(ptr, o, n) \
		((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
		(unsigned long)(n), sizeof(*(ptr))))
		#ifdef CONFIG_64BIT
		#define cmpxchg64_local(ptr, o, n) \
		({ \
		BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
		cmpxchg_local((ptr), (o), (n)); \
		})
		#else
		#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
		#endif

		#define cmpxchg64_local(ptr, o, n) cmpxchg64((ptr), (o), (n))

		#endif /* __ASM_CMPXCHG_H */