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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2009-06-12 10:26:22 +0200 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-06-12 10:27:29 +0200 |
commit | ce58ae6f7f6bdd48c87472ff830a6d586ff076b2 (patch) | |
tree | 20d9139566563a3fa8ca012e6444a0e6262bb9e2 /arch | |
parent | 76d4e00a05d06c1d1552adea24fcf6182c9d8999 (diff) | |
download | linux-3.10-ce58ae6f7f6bdd48c87472ff830a6d586ff076b2.tar.gz linux-3.10-ce58ae6f7f6bdd48c87472ff830a6d586ff076b2.tar.bz2 linux-3.10-ce58ae6f7f6bdd48c87472ff830a6d586ff076b2.zip |
[S390] implement interrupt-enabling rwlocks
arch backend for f5f7eac41db827a47b2163330eecd7bb55ae9f12
"Allow rwlocks to re-enable interrupts".
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/s390/include/asm/spinlock.h | 19 | ||||
-rw-r--r-- | arch/s390/lib/spinlock.c | 40 |
2 files changed, 56 insertions, 3 deletions
diff --git a/arch/s390/include/asm/spinlock.h b/arch/s390/include/asm/spinlock.h index f3861b09ebb..c9af0d19c7a 100644 --- a/arch/s390/include/asm/spinlock.h +++ b/arch/s390/include/asm/spinlock.h @@ -122,8 +122,10 @@ static inline void __raw_spin_unlock(raw_spinlock_t *lp) #define __raw_write_can_lock(x) ((x)->lock == 0) extern void _raw_read_lock_wait(raw_rwlock_t *lp); +extern void _raw_read_lock_wait_flags(raw_rwlock_t *lp, unsigned long flags); extern int _raw_read_trylock_retry(raw_rwlock_t *lp); extern void _raw_write_lock_wait(raw_rwlock_t *lp); +extern void _raw_write_lock_wait_flags(raw_rwlock_t *lp, unsigned long flags); extern int _raw_write_trylock_retry(raw_rwlock_t *lp); static inline void __raw_read_lock(raw_rwlock_t *rw) @@ -134,6 +136,14 @@ static inline void __raw_read_lock(raw_rwlock_t *rw) _raw_read_lock_wait(rw); } +static inline void __raw_read_lock_flags(raw_rwlock_t *rw, unsigned long flags) +{ + unsigned int old; + old = rw->lock & 0x7fffffffU; + if (_raw_compare_and_swap(&rw->lock, old, old + 1) != old) + _raw_read_lock_wait_flags(rw, flags); +} + static inline void __raw_read_unlock(raw_rwlock_t *rw) { unsigned int old, cmp; @@ -151,6 +161,12 @@ static inline void __raw_write_lock(raw_rwlock_t *rw) _raw_write_lock_wait(rw); } +static inline void __raw_write_lock_flags(raw_rwlock_t *rw, unsigned long flags) +{ + if (unlikely(_raw_compare_and_swap(&rw->lock, 0, 0x80000000) != 0)) + _raw_write_lock_wait_flags(rw, flags); +} + static inline void __raw_write_unlock(raw_rwlock_t *rw) { _raw_compare_and_swap(&rw->lock, 0x80000000, 0); @@ -172,9 +188,6 @@ static inline int __raw_write_trylock(raw_rwlock_t *rw) return _raw_write_trylock_retry(rw); } -#define __raw_read_lock_flags(lock, flags) __raw_read_lock(lock) -#define __raw_write_lock_flags(lock, flags) __raw_write_lock(lock) - #define _raw_read_relax(lock) cpu_relax() #define _raw_write_relax(lock) cpu_relax() diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c index e41f4008afc..f7e0d30250b 100644 --- a/arch/s390/lib/spinlock.c +++ b/arch/s390/lib/spinlock.c @@ -124,6 +124,27 @@ void _raw_read_lock_wait(raw_rwlock_t *rw) } EXPORT_SYMBOL(_raw_read_lock_wait); +void _raw_read_lock_wait_flags(raw_rwlock_t *rw, unsigned long flags) +{ + unsigned int old; + int count = spin_retry; + + local_irq_restore(flags); + while (1) { + if (count-- <= 0) { + _raw_yield(); + count = spin_retry; + } + if (!__raw_read_can_lock(rw)) + continue; + old = rw->lock & 0x7fffffffU; + local_irq_disable(); + if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old) + return; + } +} +EXPORT_SYMBOL(_raw_read_lock_wait_flags); + int _raw_read_trylock_retry(raw_rwlock_t *rw) { unsigned int old; @@ -157,6 +178,25 @@ void _raw_write_lock_wait(raw_rwlock_t *rw) } EXPORT_SYMBOL(_raw_write_lock_wait); +void _raw_write_lock_wait_flags(raw_rwlock_t *rw, unsigned long flags) +{ + int count = spin_retry; + + local_irq_restore(flags); + while (1) { + if (count-- <= 0) { + _raw_yield(); + count = spin_retry; + } + if (!__raw_write_can_lock(rw)) + continue; + local_irq_disable(); + if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0) + return; + } +} +EXPORT_SYMBOL(_raw_write_lock_wait_flags); + int _raw_write_trylock_retry(raw_rwlock_t *rw) { int count = spin_retry; |