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 #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 */