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s390/atomic: various small cleanups

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- add a typecheck to the defines to make sure they operate on an atomic_t
- simplify inline assembly constraints
- keep variable names common between functions

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-09-16 11:07:49 +02:00 committed by Martin Schwidefsky
parent 5692e4d11c
commit 9a70a42835
1 changed files with 24 additions and 18 deletions
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42
arch/s390/include/asm/atomic.h
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@ -28,9 +28,11 @@
#define __ATOMIC_LOOP(ptr, op_val, op_string) \
({ \
int old_val; \
\
typecheck(atomic_t *, ptr); \
asm volatile( \
op_string " %0,%2,%1\n" \
: "=d" (old_val), "+Q" (((atomic_t *)(ptr))->counter) \
: "=d" (old_val), "+Q" ((ptr)->counter) \
: "d" (op_val) \
: "cc", "memory"); \
old_val; \
@ -45,15 +47,16 @@
#define __ATOMIC_LOOP(ptr, op_val, op_string) \
({ \
int old_val, new_val; \
\
typecheck(atomic_t *, ptr); \
asm volatile( \
" l %0,%2\n" \
"0: lr %1,%0\n" \
op_string " %1,%3\n" \
" cs %0,%1,%2\n" \
" jl 0b" \
: "=&d" (old_val), "=&d" (new_val), \
"=Q" (((atomic_t *)(ptr))->counter) \
: "d" (op_val), "Q" (((atomic_t *)(ptr))->counter) \
: "=&d" (old_val), "=&d" (new_val), "+Q" ((ptr)->counter)\
: "d" (op_val) \
: "cc", "memory"); \
old_val; \
})
@ -126,8 +129,8 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
asm volatile(
" cs %0,%2,%1"
: "+d" (old), "=Q" (v->counter)
: "d" (new), "Q" (v->counter)
: "+d" (old), "+Q" (v->counter)
: "d" (new)
: "cc", "memory");
return old;
}
@ -163,9 +166,11 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
#define __ATOMIC64_LOOP(ptr, op_val, op_string) \
({ \
long long old_val; \
\
typecheck(atomic64_t *, ptr); \
asm volatile( \
op_string " %0,%2,%1\n" \
: "=d" (old_val), "+Q" (((atomic_t *)(ptr))->counter) \
: "=d" (old_val), "+Q" ((ptr)->counter) \
: "d" (op_val) \
: "cc", "memory"); \
old_val; \
@ -180,15 +185,16 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
#define __ATOMIC64_LOOP(ptr, op_val, op_string) \
({ \
long long old_val, new_val; \
\
typecheck(atomic64_t *, ptr); \
asm volatile( \
" lg %0,%2\n" \
"0: lgr %1,%0\n" \
op_string " %1,%3\n" \
" csg %0,%1,%2\n" \
" jl 0b" \
: "=&d" (old_val), "=&d" (new_val), \
"=Q" (((atomic_t *)(ptr))->counter) \
: "d" (op_val), "Q" (((atomic_t *)(ptr))->counter) \
: "=&d" (old_val), "=&d" (new_val), "+Q" ((ptr)->counter)\
: "d" (op_val) \
: "cc", "memory"); \
old_val; \
})
@ -234,8 +240,8 @@ static inline long long atomic64_cmpxchg(atomic64_t *v,
{
asm volatile(
" csg %0,%2,%1"
: "+d" (old), "=Q" (v->counter)
: "d" (new), "Q" (v->counter)
: "+d" (old), "+Q" (v->counter)
: "d" (new)
: "cc", "memory");
return old;
}
@ -276,8 +282,8 @@ static inline long long atomic64_xchg(atomic64_t *v, long long new)
" lm %0,%N0,%1\n"
"0: cds %0,%2,%1\n"
" jl 0b\n"
: "=&d" (rp_old), "=Q" (v->counter)
: "d" (rp_new), "Q" (v->counter)
: "=&d" (rp_old), "+Q" (v->counter)
: "d" (rp_new)
: "cc");
return rp_old.pair;
}
@ -290,8 +296,8 @@ static inline long long atomic64_cmpxchg(atomic64_t *v,
asm volatile(
" cds %0,%2,%1"
: "+&d" (rp_old), "=Q" (v->counter)
: "d" (rp_new), "Q" (v->counter)
: "+&d" (rp_old), "+Q" (v->counter)
: "d" (rp_new)
: "cc");
return rp_old.pair;
}
@ -347,7 +353,7 @@ static inline void atomic64_add(long long i, atomic64_t *v)
#endif
}
static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
static inline int atomic64_add_unless(atomic64_t *v, long long i, long long u)
{
long long c, old;
@ -355,7 +361,7 @@ static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
for (;;) {
if (unlikely(c == u))
break;
old = atomic64_cmpxchg(v, c, c + a);
old = atomic64_cmpxchg(v, c, c + i);
if (likely(old == c))
break;
c = old;