diff options
Diffstat (limited to 'kernel/futex/futex.h')
| -rw-r--r-- | kernel/futex/futex.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h new file mode 100644 index 000000000000..7bb4ca8bf32f --- /dev/null +++ b/kernel/futex/futex.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _FUTEX_H +#define _FUTEX_H + +#include <asm/futex.h> + +/* + * Futex flags used to encode options to functions and preserve them across + * restarts. + */ +#ifdef CONFIG_MMU +# define FLAGS_SHARED 0x01 +#else +/* + * NOMMU does not have per process address space. Let the compiler optimize + * code away. + */ +# define FLAGS_SHARED 0x00 +#endif +#define FLAGS_CLOCKRT 0x02 +#define FLAGS_HAS_TIMEOUT 0x04 + +#ifdef CONFIG_HAVE_FUTEX_CMPXCHG +#define futex_cmpxchg_enabled 1 +#else +extern int __read_mostly futex_cmpxchg_enabled; +#endif + +#ifdef CONFIG_FAIL_FUTEX +extern bool should_fail_futex(bool fshared); +#else +static inline bool should_fail_futex(bool fshared) +{ + return false; +} +#endif + +extern int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, u32 + val, ktime_t *abs_time, u32 bitset, u32 __user + *uaddr2); + +extern int futex_requeue(u32 __user *uaddr1, unsigned int flags, + u32 __user *uaddr2, int nr_wake, int nr_requeue, + u32 *cmpval, int requeue_pi); + +extern int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, + ktime_t *abs_time, u32 bitset); + +extern int futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset); + +extern int futex_wake_op(u32 __user *uaddr1, unsigned int flags, + u32 __user *uaddr2, int nr_wake, int nr_wake2, int op); + +extern int futex_unlock_pi(u32 __user *uaddr, unsigned int flags); + +extern int futex_lock_pi(u32 __user *uaddr, unsigned int flags, ktime_t *time, int trylock); + +#endif /* _FUTEX_H */ |