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 #if defined(CONFIG_X86) || defined(CONFIG_SPARC64) || defined(CONFIG_IA64) || defined(CONFIG_PARISC)
  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 /*
  49  * The maximum alignment needed for some critical structures
  50  * These could be inter-node cacheline sizes/L3 cacheline
  51  * size etc.  Define this in asm/cache.h for your arch
  52  */
  53 #ifndef INTERNODE_CACHE_SHIFT
  54 #define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT
  55 #endif
  56
  57 #if !defined(____cacheline_internodealigned_in_smp)
  58 #if defined(CONFIG_SMP)
  59 #define ____cacheline_internodealigned_in_smp \
  60         __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))
  61 #else
  62 #define ____cacheline_internodealigned_in_smp
  63 #endif
  64 #endif
  65
  66 #endif /* __LINUX_CACHE_H */