| 1 | #ifndef __LINUX_CACHE_H
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| 2 | #define __LINUX_CACHE_H
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| 3 |
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| 4 | #include <linux/kernel.h>
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| 5 | #include <asm/cache.h>
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| 6 |
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| 7 | #ifndef L1_CACHE_ALIGN
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| 8 | #define L1_CACHE_ALIGN(x) ALIGN(x, L1_CACHE_BYTES)
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| 9 | #endif
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| 10 |
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| 11 | #ifndef SMP_CACHE_BYTES
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| 12 | #define SMP_CACHE_BYTES L1_CACHE_BYTES
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| 13 | #endif
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| 14 |
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| 15 | #ifndef __read_mostly
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| 16 | #define __read_mostly
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| 17 | #endif
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| 18 |
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| 19 | #ifndef ____cacheline_aligned
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| 20 | #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
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| 21 | #endif
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| 22 |
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| 23 | #ifndef ____cacheline_aligned_in_smp
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| 24 | #ifdef CONFIG_SMP
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| 25 | #define ____cacheline_aligned_in_smp ____cacheline_aligned
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| 26 | #else
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| 27 | #define ____cacheline_aligned_in_smp
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| 28 | #endif
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| 29 | #endif
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| 30 |
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| 31 | #ifndef __cacheline_aligned
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| 32 | #define __cacheline_aligned \
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| 33 | __attribute__((__aligned__(SMP_CACHE_BYTES), \
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| 34 | __section__(".data.cacheline_aligned")))
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| 35 | #endif
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| 36 |
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| 37 | #ifndef __cacheline_aligned_in_smp
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| 38 | #ifdef CONFIG_SMP
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| 39 | #define __cacheline_aligned_in_smp __cacheline_aligned
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| 40 | #else
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| 41 | #define __cacheline_aligned_in_smp
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| 42 | #endif
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| 43 | #endif
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| 44 |
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| 45 | |
| 46 | * The maximum alignment needed for some critical structures
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| 47 | * These could be inter-node cacheline sizes/L3 cacheline
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| 48 | * size etc. Define this in asm/cache.h for your arch
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| 49 |
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| 50 | #ifndef INTERNODE_CACHE_SHIFT
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| 51 | #define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT
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| 52 | #endif
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| 53 |
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| 54 | #if !defined(____cacheline_internodealigned_in_smp)
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| 55 | #if defined(CONFIG_SMP)
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| 56 | #define ____cacheline_internodealigned_in_smp \
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| 57 | __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))
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| 58 | #else
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| 59 | #define ____cacheline_internodealigned_in_smp
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| 60 | #endif
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| 61 | #endif
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| 62 |
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| 63 | #ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE
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| 64 | #define cache_line_size() L1_CACHE_BYTES
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| 65 | #endif
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| 66 |
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| 67 | #endif
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