xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[S390] implement interrupt-enabling rwlocks

Browse Source 
arch backend for f5f7eac41d
"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>
This commit is contained in:
Heiko Carstens
2009-06-12 10:26:22 +02:00
committed by Martin Schwidefsky
parent 76d4e00a05
commit ce58ae6f7f
2 changed files with 56 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
arch/s390/include/asm/spinlock.h
View File

@@ -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()