[deliverable/linux.git] / include / linux / cache.h

#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

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