diff options
Diffstat (limited to 'arch/s390/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/s390/include/asm/cmpxchg.h | 44 |
1 files changed, 24 insertions, 20 deletions
diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h index 1960a7295ae5..84c3f0d576c5 100644 --- a/arch/s390/include/asm/cmpxchg.h +++ b/arch/s390/include/asm/cmpxchg.h @@ -169,32 +169,36 @@ static __always_inline unsigned long __cmpxchg(unsigned long address, #define system_has_cmpxchg_double() 1 -#define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \ -({ \ - register __typeof__(*(p1)) __old1 asm("2") = (o1); \ - register __typeof__(*(p2)) __old2 asm("3") = (o2); \ - register __typeof__(*(p1)) __new1 asm("4") = (n1); \ - register __typeof__(*(p2)) __new2 asm("5") = (n2); \ - int cc; \ - asm volatile( \ - " cdsg %[old],%[new],%[ptr]\n" \ - " ipm %[cc]\n" \ - " srl %[cc],28" \ - : [cc] "=d" (cc), [old] "+d" (__old1), "+d" (__old2) \ - : [new] "d" (__new1), "d" (__new2), \ - [ptr] "Q" (*(p1)), "Q" (*(p2)) \ - : "memory", "cc"); \ - !cc; \ -}) +static __always_inline int __cmpxchg_double(unsigned long p1, unsigned long p2, + unsigned long o1, unsigned long o2, + unsigned long n1, unsigned long n2) +{ + union register_pair old = { .even = o1, .odd = o2, }; + union register_pair new = { .even = n1, .odd = n2, }; + int cc; + + asm volatile( + " cdsg %[old],%[new],%[ptr]\n" + " ipm %[cc]\n" + " srl %[cc],28\n" + : [cc] "=&d" (cc), [old] "+&d" (old.pair) + : [new] "d" (new.pair), + [ptr] "QS" (*(unsigned long *)p1), "Q" (*(unsigned long *)p2) + : "memory", "cc"); + return !cc; +} #define arch_cmpxchg_double(p1, p2, o1, o2, n1, n2) \ ({ \ - __typeof__(p1) __p1 = (p1); \ - __typeof__(p2) __p2 = (p2); \ + typeof(p1) __p1 = (p1); \ + typeof(p2) __p2 = (p2); \ + \ BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \ BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \ VM_BUG_ON((unsigned long)((__p1) + 1) != (unsigned long)(__p2));\ - __cmpxchg_double(__p1, __p2, o1, o2, n1, n2); \ + __cmpxchg_double((unsigned long)__p1, (unsigned long)__p2, \ + (unsigned long)(o1), (unsigned long)(o2), \ + (unsigned long)(n1), (unsigned long)(n2)); \ }) #endif /* __ASM_CMPXCHG_H */ |