Commit 54eaae30 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky

[S390] cmpxchg: implement cmpxchg64()

We have a cmpxchg64_local() implementation but strange enough the
SMP capable variant cmpxchg64() is missing. So implement it.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent a2c9dbe8
......@@ -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 */
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