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88 lines
2.6 KiB
88 lines
2.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#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. Its use should be reserved for data that is used |
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* frequently in hot paths. Performance traces can help decide when to use |
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* this. You want __read_mostly data to be tightly packed, so that in the |
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* best case multiple frequently read variables for a hot path will be next |
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* to each other in order to reduce the number of cachelines needed to |
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* execute a critical path. We should be mindful and selective of its use. |
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* ie: if you're going to use it please supply a *good* justification in your |
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* commit log |
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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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#ifndef __ro_after_init |
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#define __ro_after_init __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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