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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2010-02-26 21:37:31 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-02-26 21:37:30 (GMT) |
| commit | 987bcdacb18a3adc2a48d85c9b005069c2f4dd7b (patch) | |
| tree | 65da88589e2c95a4677090b570f49402e870e573 /arch/s390/include/asm/spinlock.h | |
| parent | d1bf85902c28dd990c08f1703ea94109223549a7 (diff) | |
| download | linux-987bcdacb18a3adc2a48d85c9b005069c2f4dd7b.tar.xz | |
[S390] use inline assembly contraints available with gcc 3.3.3
Drop support to compile the kernel with gcc versions older than 3.3.3.
This allows us to use the "Q" inline assembly contraint on some more
inline assemblies without duplicating a lot of complex code (e.g. __xchg
and __cmpxchg). The distinction for older gcc versions can be removed
which saves a few lines and simplifies the code.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/spinlock.h')
| -rw-r--r-- | arch/s390/include/asm/spinlock.h | 18 |
1 files changed, 0 insertions, 18 deletions
diff --git a/arch/s390/include/asm/spinlock.h b/arch/s390/include/asm/spinlock.h index a587907..56612fc 100644 --- a/arch/s390/include/asm/spinlock.h +++ b/arch/s390/include/asm/spinlock.h @@ -13,8 +13,6 @@ #include <linux/smp.h> -#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) - static inline int _raw_compare_and_swap(volatile unsigned int *lock, unsigned int old, unsigned int new) @@ -27,22 +25,6 @@ _raw_compare_and_swap(volatile unsigned int *lock, return old; } -#else /* __GNUC__ */ - -static inline int -_raw_compare_and_swap(volatile unsigned int *lock, - unsigned int old, unsigned int new) -{ - asm volatile( - " cs %0,%3,0(%4)" - : "=d" (old), "=m" (*lock) - : "0" (old), "d" (new), "a" (lock), "m" (*lock) - : "cc", "memory" ); - return old; -} - -#endif /* __GNUC__ */ - /* * Simple spin lock operations. There are two variants, one clears IRQ's * on the local processor, one does not. |