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ppc: Add atomic_dec_return()

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Borrowed from Linux kernel.

travis-ci: success for series starting with [1/2] ppc: Add atomic_dec_return()
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Kirill Tkhai 2016-11-01 19:35:11 +03:00 • committed by Pavel Emelyanov
parent 6c7eb2ee99
commit 994d9d4ea6
1 changed files with 20 additions and 0 deletions
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20
include/common/arch/ppc64/asm/atomic.h
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@ -107,6 +107,26 @@ static __inline__ void atomic_dec(atomic_t *v)
: "cc", "xer");
}
static __inline__ int atomic_sub_return(int a, atomic_t *v)
{
int t;
__asm__ __volatile__(
" \nLWSYNC\n"
"1: lwarx %0,0,%2 # atomic_sub_return\n\
subf %0,%1,%0\n"
" stwcx. %0,0,%2 \n\
bne- 1b"
" \nsync\n"
: "=&r" (t)
: "r" (a), "r" (&v->counter)
: "cc", "memory");
return t;
}
#define atomic_dec_return(v) (atomic_sub_return(1, v))
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#endif /* __CR_ATOMIC_H__ */