diff options
Diffstat (limited to 'arch/tile/include/asm/spinlock_64.h')
| -rw-r--r-- | arch/tile/include/asm/spinlock_64.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/tile/include/asm/spinlock_64.h b/arch/tile/include/asm/spinlock_64.h index 9a12b9c7e..b9718fb4e 100644 --- a/arch/tile/include/asm/spinlock_64.h +++ b/arch/tile/include/asm/spinlock_64.h @@ -18,6 +18,8 @@ #ifndef _ASM_TILE_SPINLOCK_64_H #define _ASM_TILE_SPINLOCK_64_H +#include <linux/compiler.h> + /* Shifts and masks for the various fields in "lock". */ #define __ARCH_SPIN_CURRENT_SHIFT 17 #define __ARCH_SPIN_NEXT_MASK 0x7fff @@ -44,7 +46,8 @@ static inline u32 arch_spin_next(u32 val) /* The lock is locked if a task would have to wait to get it. */ static inline int arch_spin_is_locked(arch_spinlock_t *lock) { - u32 val = lock->lock; + /* Use READ_ONCE() to ensure that calling this in a loop is OK. */ + u32 val = READ_ONCE(lock->lock); return arch_spin_current(val) != arch_spin_next(val); } |