Eric Lee / smarc-fsl-linux-kernel

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include/linux/cache.h 1.58 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #ifndef __LINUX_CACHE_H
  #define __LINUX_CACHE_H
  
  #include <linux/kernel.h>
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  #include <asm/cache.h>
  
  #ifndef L1_CACHE_ALIGN
  #define L1_CACHE_ALIGN(x) ALIGN(x, L1_CACHE_BYTES)
  #endif
  
  #ifndef SMP_CACHE_BYTES
  #define SMP_CACHE_BYTES L1_CACHE_BYTES
  #endif
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  #ifndef __read_mostly
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  #define __read_mostly
  #endif
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  #ifndef ____cacheline_aligned
  #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
  #endif
  
  #ifndef ____cacheline_aligned_in_smp
  #ifdef CONFIG_SMP
  #define ____cacheline_aligned_in_smp ____cacheline_aligned
  #else
  #define ____cacheline_aligned_in_smp
  #endif /* CONFIG_SMP */
  #endif
  
  #ifndef __cacheline_aligned
  #define __cacheline_aligned					\
    __attribute__((__aligned__(SMP_CACHE_BYTES),			\
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  		 __section__(".data..cacheline_aligned")))
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  #endif /* __cacheline_aligned */
  
  #ifndef __cacheline_aligned_in_smp
  #ifdef CONFIG_SMP
  #define __cacheline_aligned_in_smp __cacheline_aligned
  #else
  #define __cacheline_aligned_in_smp
  #endif /* CONFIG_SMP */
  #endif
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  /*
   * The maximum alignment needed for some critical structures
   * These could be inter-node cacheline sizes/L3 cacheline
   * size etc.  Define this in asm/cache.h for your arch
   */
  #ifndef INTERNODE_CACHE_SHIFT
  #define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT
  #endif
  
  #if !defined(____cacheline_internodealigned_in_smp)
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  #if defined(CONFIG_SMP)
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  #define ____cacheline_internodealigned_in_smp \
  	__attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))
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  #else
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  #define ____cacheline_internodealigned_in_smp
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  #endif
  #endif
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  #ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE
  #define cache_line_size()	L1_CACHE_BYTES
  #endif
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  #endif /* __LINUX_CACHE_H */