Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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#ifndef __read_mostly
17#define __read_mostly
18#endif
19
20#ifndef ____cacheline_aligned
21#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
22#endif
23
24#ifndef ____cacheline_aligned_in_smp
25#ifdef CONFIG_SMP
26#define ____cacheline_aligned_in_smp ____cacheline_aligned
27#else
28#define ____cacheline_aligned_in_smp
29#endif /* CONFIG_SMP */
30#endif
31
32#ifndef __cacheline_aligned
33#define __cacheline_aligned \
34 __attribute__((__aligned__(SMP_CACHE_BYTES), \
35 __section__(".data.cacheline_aligned")))
36#endif /* __cacheline_aligned */
37
38#ifndef __cacheline_aligned_in_smp
39#ifdef CONFIG_SMP
40#define __cacheline_aligned_in_smp __cacheline_aligned
41#else
42#define __cacheline_aligned_in_smp
43#endif /* CONFIG_SMP */
44#endif
45
46/*
47 * The maximum alignment needed for some critical structures
48 * These could be inter-node cacheline sizes/L3 cacheline
49 * size etc. Define this in asm/cache.h for your arch
50 */
51#ifndef INTERNODE_CACHE_SHIFT
52#define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT
53#endif
54
55#if !defined(____cacheline_internodealigned_in_smp)
56#if defined(CONFIG_SMP)
57#define ____cacheline_internodealigned_in_smp \
58 __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))
59#else
60#define ____cacheline_internodealigned_in_smp
61#endif
62#endif
63
64#endif /* __LINUX_CACHE_H */