[PATCH] mostly_read data section
[linux-2.6.git] / include / linux / cache.h
1 #ifndef __LINUX_CACHE_H
2 #define __LINUX_CACHE_H
3
4 #include <linux/kernel.h>
5 #include <linux/config.h>
6 #include <asm/cache.h>
7
8 #ifndef L1_CACHE_ALIGN
9 #define L1_CACHE_ALIGN(x) ALIGN(x, L1_CACHE_BYTES)
10 #endif
11
12 #ifndef SMP_CACHE_BYTES
13 #define SMP_CACHE_BYTES L1_CACHE_BYTES
14 #endif
15
16 #ifdef CONFIG_X86
17 #define __read_mostly __attribute__((__section__(".data.read_mostly")))
18 #else
19 #define __read_mostly
20 #endif
21
22 #ifndef ____cacheline_aligned
23 #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
24 #endif
25
26 #ifndef ____cacheline_aligned_in_smp
27 #ifdef CONFIG_SMP
28 #define ____cacheline_aligned_in_smp ____cacheline_aligned
29 #else
30 #define ____cacheline_aligned_in_smp
31 #endif /* CONFIG_SMP */
32 #endif
33
34 #ifndef __cacheline_aligned
35 #define __cacheline_aligned                                     \
36   __attribute__((__aligned__(SMP_CACHE_BYTES),                  \
37                  __section__(".data.cacheline_aligned")))
38 #endif /* __cacheline_aligned */
39
40 #ifndef __cacheline_aligned_in_smp
41 #ifdef CONFIG_SMP
42 #define __cacheline_aligned_in_smp __cacheline_aligned
43 #else
44 #define __cacheline_aligned_in_smp
45 #endif /* CONFIG_SMP */
46 #endif
47
48 #if !defined(____cacheline_maxaligned_in_smp)
49 #if defined(CONFIG_SMP)
50 #define ____cacheline_maxaligned_in_smp \
51         __attribute__((__aligned__(1 << (L1_CACHE_SHIFT_MAX))))
52 #else
53 #define ____cacheline_maxaligned_in_smp
54 #endif
55 #endif
56
57 #endif /* __LINUX_CACHE_H */