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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5270 | serge | 1 | #ifndef __LINUX_CACHE_H |
| 2 | #define __LINUX_CACHE_H |
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| 3 | |||
| 4 | #include |
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| 5 | #include |
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| 6 | |||
| 7 | #ifndef L1_CACHE_ALIGN |
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| 8 | #define L1_CACHE_ALIGN(x) __ALIGN_KERNEL(x, L1_CACHE_BYTES) |
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| 9 | #endif |
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| 10 | |||
| 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 | |||
| 7143 | serge | 15 | /* |
| 16 | * __read_mostly is used to keep rarely changing variables out of frequently |
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| 17 | * updated cachelines. If an architecture doesn't support it, ignore the |
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| 18 | * hint. |
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| 19 | */ |
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| 5270 | serge | 20 | #ifndef __read_mostly |
| 21 | #define __read_mostly |
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| 22 | #endif |
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| 23 | |||
| 7143 | serge | 24 | /* |
| 25 | * __ro_after_init is used to mark things that are read-only after init (i.e. |
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| 26 | * after mark_rodata_ro() has been called). These are effectively read-only, |
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| 27 | * but may get written to during init, so can't live in .rodata (via "const"). |
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| 28 | */ |
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| 29 | #ifndef __ro_after_init |
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| 30 | #define __ro_after_init __attribute__((__section__(".data..ro_after_init"))) |
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| 31 | #endif |
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| 32 | |||
| 5270 | serge | 33 | #ifndef ____cacheline_aligned |
| 34 | #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES))) |
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| 35 | #endif |
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| 36 | |||
| 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 /* CONFIG_SMP */ |
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| 43 | #endif |
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| 44 | |||
| 45 | #ifndef __cacheline_aligned |
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| 46 | #define __cacheline_aligned \ |
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| 47 | __attribute__((__aligned__(SMP_CACHE_BYTES), \ |
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| 48 | __section__(".data..cacheline_aligned"))) |
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| 49 | #endif /* __cacheline_aligned */ |
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| 50 | |||
| 51 | #ifndef __cacheline_aligned_in_smp |
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| 52 | #ifdef CONFIG_SMP |
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| 53 | #define __cacheline_aligned_in_smp __cacheline_aligned |
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| 54 | #else |
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| 55 | #define __cacheline_aligned_in_smp |
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| 56 | #endif /* CONFIG_SMP */ |
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| 57 | #endif |
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| 58 | |||
| 59 | /* |
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| 60 | * The maximum alignment needed for some critical structures |
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| 61 | * These could be inter-node cacheline sizes/L3 cacheline |
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| 62 | * size etc. Define this in asm/cache.h for your arch |
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| 63 | */ |
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| 64 | #ifndef INTERNODE_CACHE_SHIFT |
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| 65 | #define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT |
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| 66 | #endif |
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| 67 | |||
| 68 | #if !defined(____cacheline_internodealigned_in_smp) |
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| 69 | #if defined(CONFIG_SMP) |
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| 70 | #define ____cacheline_internodealigned_in_smp \ |
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| 71 | __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT)))) |
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| 72 | #else |
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| 73 | #define ____cacheline_internodealigned_in_smp |
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| 74 | #endif |
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| 75 | #endif |
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| 76 | |||
| 77 | #ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE |
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| 78 | #define cache_line_size() L1_CACHE_BYTES |
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| 79 | #endif |
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| 80 | |||
| 81 | #endif /* __LINUX_CACHE_H */ |