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1da177e4 LT |
1 | #ifndef __LINUX_CACHE_H |
2 | #define __LINUX_CACHE_H | |
3 | ||
c28aa1f0 | 4 | #include <uapi/linux/kernel.h> |
1da177e4 LT |
5 | #include <asm/cache.h> |
6 | ||
7 | #ifndef L1_CACHE_ALIGN | |
c28aa1f0 | 8 | #define L1_CACHE_ALIGN(x) __ALIGN_KERNEL(x, L1_CACHE_BYTES) |
1da177e4 LT |
9 | #endif |
10 | ||
11 | #ifndef SMP_CACHE_BYTES | |
12 | #define SMP_CACHE_BYTES L1_CACHE_BYTES | |
13 | #endif | |
14 | ||
c74ba8b3 KC |
15 | /* |
16 | * __read_mostly is used to keep rarely changing variables out of frequently | |
17 | * updated cachelines. If an architecture doesn't support it, ignore the | |
18 | * hint. | |
19 | */ | |
804f1594 | 20 | #ifndef __read_mostly |
6c036527 CL |
21 | #define __read_mostly |
22 | #endif | |
23 | ||
c74ba8b3 KC |
24 | /* |
25 | * __ro_after_init is used to mark things that are read-only after init (i.e. | |
26 | * after mark_rodata_ro() has been called). These are effectively read-only, | |
27 | * but may get written to during init, so can't live in .rodata (via "const"). | |
28 | */ | |
29 | #ifndef __ro_after_init | |
30 | #define __ro_after_init __attribute__((__section__(".data..ro_after_init"))) | |
31 | #endif | |
32 | ||
1da177e4 LT |
33 | #ifndef ____cacheline_aligned |
34 | #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES))) | |
35 | #endif | |
36 | ||
37 | #ifndef ____cacheline_aligned_in_smp | |
38 | #ifdef CONFIG_SMP | |
39 | #define ____cacheline_aligned_in_smp ____cacheline_aligned | |
40 | #else | |
41 | #define ____cacheline_aligned_in_smp | |
42 | #endif /* CONFIG_SMP */ | |
43 | #endif | |
44 | ||
45 | #ifndef __cacheline_aligned | |
46 | #define __cacheline_aligned \ | |
47 | __attribute__((__aligned__(SMP_CACHE_BYTES), \ | |
4af57b78 | 48 | __section__(".data..cacheline_aligned"))) |
1da177e4 LT |
49 | #endif /* __cacheline_aligned */ |
50 | ||
51 | #ifndef __cacheline_aligned_in_smp | |
52 | #ifdef CONFIG_SMP | |
53 | #define __cacheline_aligned_in_smp __cacheline_aligned | |
54 | #else | |
55 | #define __cacheline_aligned_in_smp | |
56 | #endif /* CONFIG_SMP */ | |
57 | #endif | |
58 | ||
22fc6ecc RT |
59 | /* |
60 | * The maximum alignment needed for some critical structures | |
61 | * These could be inter-node cacheline sizes/L3 cacheline | |
62 | * size etc. Define this in asm/cache.h for your arch | |
63 | */ | |
64 | #ifndef INTERNODE_CACHE_SHIFT | |
65 | #define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT | |
66 | #endif | |
67 | ||
68 | #if !defined(____cacheline_internodealigned_in_smp) | |
1da177e4 | 69 | #if defined(CONFIG_SMP) |
22fc6ecc RT |
70 | #define ____cacheline_internodealigned_in_smp \ |
71 | __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT)))) | |
1da177e4 | 72 | #else |
22fc6ecc | 73 | #define ____cacheline_internodealigned_in_smp |
1da177e4 LT |
74 | #endif |
75 | #endif | |
76 | ||
1b27d05b PE |
77 | #ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE |
78 | #define cache_line_size() L1_CACHE_BYTES | |
79 | #endif | |
80 | ||
1da177e4 | 81 | #endif /* __LINUX_CACHE_H */ |