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[S390] add generic atomic64 support for 31 bit 

Performance counters need 64 bit atomic operations.
To keep the patch small we use the simple generic atomic64_t implementation.
The native implementation follows with the next kernel.

Fixes this build bug:

In file included from kernel/sched.c:42:
include/linux/perf_counter.h:427: error: expected specifier-qualifier-list before 'atomic64_t'

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 2009-07-07 16:37:12 +02:00 committed by Martin Schwidefsky
parent 2c48c4d631
commit 25ca1251dc
2 changed files with 7 additions and 1 deletions
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1
arch/s390/Kconfig
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@ -95,6 +95,7 @@ config S390
select HAVE_ARCH_TRACEHOOK
select INIT_ALL_POSSIBLE
select HAVE_PERF_COUNTERS
select GENERIC_ATOMIC64 if !64BIT
config SCHED_OMIT_FRAME_POINTER
bool

7
arch/s390/include/asm/atomic.h
View File

@ -268,7 +268,12 @@ static __inline__ int atomic64_add_unless(atomic64_t *v,
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
#undef __CSG_LOOP
#endif
#else /* __s390x__ */
#include <asm-generic/atomic64.h>
#endif /* __s390x__ */
#define smp_mb__before_atomic_dec() smp_mb()
#define smp_mb__after_atomic_dec() smp_mb()