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)
  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 #if !defined(____cacheline_maxaligned_in_smp)
  49 #if defined(CONFIG_SMP)
  50 #define ____cacheline_maxaligned_in_smp \
  51         __attribute__((__aligned__(1 << (L1_CACHE_SHIFT_MAX))))
  52 #else
  53 #define ____cacheline_maxaligned_in_smp
  54 #endif
  55 #endif
  56
  57 #endif /* __LINUX_CACHE_H */