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91 lines
2.3 KiB
91 lines
2.3 KiB
#ifndef __LINUX_CACHE_H |
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#define __LINUX_CACHE_H |
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#include <uapi/linux/kernel.h> |
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#include <asm/cache.h> |
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#ifndef L1_CACHE_ALIGN |
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#define L1_CACHE_ALIGN(x) __ALIGN_KERNEL(x, L1_CACHE_BYTES) |
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#endif |
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#ifndef SMP_CACHE_BYTES |
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#define SMP_CACHE_BYTES L1_CACHE_BYTES |
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#endif |
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/* |
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* __read_mostly is used to keep rarely changing variables out of frequently |
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* updated cachelines. If an architecture doesn't support it, ignore the |
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* hint. |
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*/ |
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#ifndef __read_mostly |
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#define __read_mostly |
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#endif |
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/* |
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* __ro_after_init is used to mark things that are read-only after init (i.e. |
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* after mark_rodata_ro() has been called). These are effectively read-only, |
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* but may get written to during init, so can't live in .rodata (via "const"). |
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*/ |
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#ifdef CONFIG_PAX_KERNEXEC |
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# ifdef __ro_after_init |
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# error KERNEXEC requires __read_only |
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# endif |
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# define __read_only __attribute__((__section__(".data..read_only"))) |
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# define __ro_after_init __read_only |
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#else |
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# define __read_only __read_mostly |
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#endif |
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#ifndef __ro_after_init |
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#define __ro_after_init __attribute__((__section__(".data..ro_after_init"))) |
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#endif |
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#ifndef ____cacheline_aligned |
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#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES))) |
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#endif |
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#ifndef ____cacheline_aligned_in_smp |
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#ifdef CONFIG_SMP |
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#define ____cacheline_aligned_in_smp ____cacheline_aligned |
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#else |
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#define ____cacheline_aligned_in_smp |
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#endif /* CONFIG_SMP */ |
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#endif |
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#ifndef __cacheline_aligned |
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#define __cacheline_aligned \ |
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__attribute__((__aligned__(SMP_CACHE_BYTES), \ |
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__section__(".data..cacheline_aligned"))) |
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#endif /* __cacheline_aligned */ |
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#ifndef __cacheline_aligned_in_smp |
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#ifdef CONFIG_SMP |
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#define __cacheline_aligned_in_smp __cacheline_aligned |
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#else |
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#define __cacheline_aligned_in_smp |
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#endif /* CONFIG_SMP */ |
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#endif |
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/* |
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* The maximum alignment needed for some critical structures |
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* These could be inter-node cacheline sizes/L3 cacheline |
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* size etc. Define this in asm/cache.h for your arch |
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*/ |
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#ifndef INTERNODE_CACHE_SHIFT |
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#define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT |
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#endif |
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#if !defined(____cacheline_internodealigned_in_smp) |
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#if defined(CONFIG_SMP) |
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#define ____cacheline_internodealigned_in_smp \ |
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__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 |
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#endif |
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#ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE |
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#define cache_line_size() L1_CACHE_BYTES |
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#endif |
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#endif /* __LINUX_CACHE_H */
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