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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
---|---|
2 | #ifndef __ASM_GENERIC_CMPXCHG_LOCAL_H |
3 | #define __ASM_GENERIC_CMPXCHG_LOCAL_H |
4 | |
5 | #include <linux/types.h> |
6 | #include <linux/irqflags.h> |
7 | |
8 | extern unsigned long wrong_size_cmpxchg(volatile void *ptr) |
9 | __noreturn; |
10 | |
11 | /* |
12 | * Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned |
13 | * long parameter, supporting various types of architectures. |
14 | */ |
15 | static inline unsigned long __generic_cmpxchg_local(volatile void *ptr, |
16 | unsigned long old, unsigned long new, int size) |
17 | { |
18 | unsigned long flags, prev; |
19 | |
20 | /* |
21 | * Sanity checking, compile-time. |
22 | */ |
23 | if (size == 8 && sizeof(unsigned long) != 8) |
24 | wrong_size_cmpxchg(ptr); |
25 | |
26 | raw_local_irq_save(flags); |
27 | switch (size) { |
28 | case 1: prev = *(u8 *)ptr; |
29 | if (prev == (old & 0xffu)) |
30 | *(u8 *)ptr = (new & 0xffu); |
31 | break; |
32 | case 2: prev = *(u16 *)ptr; |
33 | if (prev == (old & 0xffffu)) |
34 | *(u16 *)ptr = (new & 0xffffu); |
35 | break; |
36 | case 4: prev = *(u32 *)ptr; |
37 | if (prev == (old & 0xffffffffffu)) |
38 | *(u32 *)ptr = (new & 0xffffffffu); |
39 | break; |
40 | case 8: prev = *(u64 *)ptr; |
41 | if (prev == old) |
42 | *(u64 *)ptr = (u64)new; |
43 | break; |
44 | default: |
45 | wrong_size_cmpxchg(ptr); |
46 | } |
47 | raw_local_irq_restore(flags); |
48 | return prev; |
49 | } |
50 | |
51 | /* |
52 | * Generic version of __cmpxchg64_local. Takes an u64 parameter. |
53 | */ |
54 | static inline u64 __generic_cmpxchg64_local(volatile void *ptr, |
55 | u64 old, u64 new) |
56 | { |
57 | u64 prev; |
58 | unsigned long flags; |
59 | |
60 | raw_local_irq_save(flags); |
61 | prev = *(u64 *)ptr; |
62 | if (prev == old) |
63 | *(u64 *)ptr = new; |
64 | raw_local_irq_restore(flags); |
65 | return prev; |
66 | } |
67 | |
68 | #endif |
69 |
Warning: That file was not part of the compilation database. It may have many parsing errors.