blob: 4552504c02289239953aab738adede76c8da20f3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_CACHE_H
2#define __LINUX_CACHE_H
3
4#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <asm/cache.h>
6
7#ifndef L1_CACHE_ALIGN
8#define L1_CACHE_ALIGN(x) ALIGN(x, L1_CACHE_BYTES)
9#endif
10
11#ifndef SMP_CACHE_BYTES
12#define SMP_CACHE_BYTES L1_CACHE_BYTES
13#endif
14
Kyle McMartin804f1592006-03-23 03:00:16 -080015#ifndef __read_mostly
Christoph Lameter6c036522005-07-07 17:56:59 -070016#define __read_mostly
17#endif
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#ifndef ____cacheline_aligned
20#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
21#endif
22
23#ifndef ____cacheline_aligned_in_smp
24#ifdef CONFIG_SMP
25#define ____cacheline_aligned_in_smp ____cacheline_aligned
26#else
27#define ____cacheline_aligned_in_smp
28#endif /* CONFIG_SMP */
29#endif
30
31#ifndef __cacheline_aligned
32#define __cacheline_aligned \
33 __attribute__((__aligned__(SMP_CACHE_BYTES), \
34 __section__(".data.cacheline_aligned")))
35#endif /* __cacheline_aligned */
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
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080045/*
46 * The maximum alignment needed for some critical structures
47 * These could be inter-node cacheline sizes/L3 cacheline
48 * size etc. Define this in asm/cache.h for your arch
49 */
50#ifndef INTERNODE_CACHE_SHIFT
51#define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT
52#endif
53
54#if !defined(____cacheline_internodealigned_in_smp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#if defined(CONFIG_SMP)
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080056#define ____cacheline_internodealigned_in_smp \
57 __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#else
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080059#define ____cacheline_internodealigned_in_smp
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#endif
61#endif
62
63#endif /* __LINUX_CACHE_H */