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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_FUTEX_H |
3 | #define _LINUX_FUTEX_H | |
4 | ||
2456e855 | 5 | #include <linux/ktime.h> |
607ca46e | 6 | #include <uapi/linux/futex.h> |
0771dfef | 7 | |
9064a678 MF |
8 | struct inode; |
9 | struct mm_struct; | |
10 | struct task_struct; | |
9064a678 | 11 | |
2456e855 | 12 | long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout, |
e2970f2f | 13 | u32 __user *uaddr2, u32 val2, u32 val3); |
1da177e4 | 14 | |
e3f2ddea IM |
15 | extern int |
16 | handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi); | |
0771dfef | 17 | |
9adef58b RR |
18 | /* |
19 | * Futexes are matched on equal values of this key. | |
20 | * The key type depends on whether it's a shared or private mapping. | |
21 | * Don't rearrange members without looking at hash_futex(). | |
22 | * | |
23 | * offset is aligned to a multiple of sizeof(u32) (== 4) by definition. | |
34f01cc1 ED |
24 | * We use the two low order bits of offset to tell what is the kind of key : |
25 | * 00 : Private process futex (PTHREAD_PROCESS_PRIVATE) | |
26 | * (no reference on an inode or mm) | |
27 | * 01 : Shared futex (PTHREAD_PROCESS_SHARED) | |
28 | * mapped on a file (reference on the underlying inode) | |
29 | * 10 : Shared futex (PTHREAD_PROCESS_SHARED) | |
30 | * (but private mapping on an mm, and reference taken on it) | |
31 | */ | |
32 | ||
33 | #define FUT_OFF_INODE 1 /* We set bit 0 if key has a reference on inode */ | |
34 | #define FUT_OFF_MMSHARED 2 /* We set bit 1 if key has a reference on mm */ | |
35 | ||
9adef58b RR |
36 | union futex_key { |
37 | struct { | |
38 | unsigned long pgoff; | |
39 | struct inode *inode; | |
40 | int offset; | |
41 | } shared; | |
42 | struct { | |
43 | unsigned long address; | |
44 | struct mm_struct *mm; | |
45 | int offset; | |
46 | } private; | |
47 | struct { | |
48 | unsigned long word; | |
49 | void *ptr; | |
50 | int offset; | |
51 | } both; | |
52 | }; | |
9adef58b | 53 | |
38d47c1b PZ |
54 | #define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = NULL } } |
55 | ||
0771dfef IM |
56 | #ifdef CONFIG_FUTEX |
57 | extern void exit_robust_list(struct task_struct *curr); | |
03b8c7b6 HC |
58 | #ifdef CONFIG_HAVE_FUTEX_CMPXCHG |
59 | #define futex_cmpxchg_enabled 1 | |
60 | #else | |
a0c1e907 | 61 | extern int futex_cmpxchg_enabled; |
03b8c7b6 | 62 | #endif |
0771dfef IM |
63 | #else |
64 | static inline void exit_robust_list(struct task_struct *curr) | |
65 | { | |
66 | } | |
bc2eecd7 NP |
67 | #endif |
68 | ||
69 | #ifdef CONFIG_FUTEX_PI | |
70 | extern void exit_pi_state_list(struct task_struct *curr); | |
71 | #else | |
c87e2837 IM |
72 | static inline void exit_pi_state_list(struct task_struct *curr) |
73 | { | |
74 | } | |
0771dfef | 75 | #endif |
bc2eecd7 | 76 | |
1da177e4 | 77 | #endif |