#ifndef __LINUX_CACHE_H#define __LINUX_CACHE_H #include <uapi/linux/kernel.h>#include <asm/cache.h> #ifndef L1_CACHE_ALIGN#define L1_CACHE_ALIGN(x) __ALIGN_KERNEL(x, L1_CACHE_BYTES)#endif #ifndef SMP_CACHE_BYTES#define SMP_CACHE_BYTES L1_CACHE_BYTES#endif /* * __read_mostly is used to keep rarely changing variables out of frequently * updated cachelines. If an architecture doesn't support it, ignore the * hint. */#ifndef __read_mostly#define __read_mostly#endif /* * __ro_after_init is used to mark things that are read-only after init (i.e. * after mark_rodata_ro() has been called). These are effectively read-only, * but may get written to during init, so can't live in .rodata (via "const"). */#ifndef __ro_after_init#define __ro_after_init __attribute__((__section__(".data..ro_after_init")))#endif #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),			\		 __section__(".data..cacheline_aligned")))#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 /* * 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)#if defined(CONFIG_SMP)#define ____cacheline_internodealigned_in_smp \	__attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))#else#define ____cacheline_internodealigned_in_smp#endif#endif #ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE#define cache_line_size()	L1_CACHE_BYTES#endif #endif /* __LINUX_CACHE_H */