linux/include/linux/cache.h
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   1#ifndef __LINUX_CACHE_H
   2#define __LINUX_CACHE_H
   3
   4#include <linux/kernel.h>
   5#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
  15#ifndef __read_mostly
  16#define __read_mostly
  17#endif
  18
  19#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
  45/*
  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)
  55#if defined(CONFIG_SMP)
  56#define ____cacheline_internodealigned_in_smp \
  57        __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))
  58#else
  59#define ____cacheline_internodealigned_in_smp
  60#endif
  61#endif
  62
  63#ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE
  64#define cache_line_size()       L1_CACHE_BYTES
  65#endif
  66
  67#endif /* __LINUX_CACHE_H */
  68
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