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queued_spin_lock: fix compatibility with Linux

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Balazs Gerofi
2018-04-18 18:14:45 +09:00
parent 5a2f8388a6
commit 166c6105ef
1 changed files with 7 additions and 16 deletions
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23
kernel/include/hfi1/ihk_hfi1_common.h
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@@ -91,31 +91,22 @@ typedef ihk_spinlock_t spinlock_t;
/* /*
* Linux queued_spin_lock compatible spin_lock, without the queue. * Linux queued_spin_lock compatible spin_lock, without the queue.
* We use _Q_PENDING_VAL as locked value to make sure no Linux cores
* enter the queue phase in queued_spin_lock_slowpath().
*/ */
#define _Q_LOCKED_OFFSET 0 #define _Q_LOCKED_OFFSET 0
#define _Q_LOCKED_BITS 8 #define _Q_LOCKED_VAL (1U << _Q_LOCKED_OFFSET)
#define _Q_PENDING_OFFSET (_Q_LOCKED_OFFSET + _Q_LOCKED_BITS)
#define _Q_PENDING_VAL (1U << _Q_PENDING_OFFSET)
#define linux_spin_lock(lock) \ #define linux_spin_lock(lock) \
do { \ do { \
uint32_t val; \ while (!__sync_bool_compare_and_swap( \
do { \ (unsigned int *)lock, 0, \
val = atomic_cmpxchg4( \ _Q_LOCKED_VAL)) { \
(unsigned int *)lock, 0, \
_Q_PENDING_VAL); \
if (val == 0) \
break; \
cpu_pause(); \ cpu_pause(); \
} \ } \
while (1); \
} while (0) } while (0)
#define linux_spin_unlock(lock) \ #define linux_spin_unlock(lock) \
do { \ do { \
ihk_atomic_set((ihk_atomic_t *)lock, 0); \ ihk_atomic_sub(_Q_LOCKED_VAL, (ihk_atomic_t *)lock); \
} while (0) } while (0)
#define linux_spin_lock_irqsave(lock, flags) \ #define linux_spin_lock_irqsave(lock, flags) \