Release 4.7 include/asm-generic/cacheflush.h

#ifndef __ASM_CACHEFLUSH_H

#define __ASM_CACHEFLUSH_H

/* Keep includes the same across arches.  */
#include <linux/mm.h>

/*
 * The cache doesn't need to be flushed when TLB entries change when
 * the cache is mapped to physical memory, not virtual memory
 */

#define flush_cache_all()			do { } while (0)

#define flush_cache_mm(mm)			do { } while (0)

#define flush_cache_dup_mm(mm)			do { } while (0)

#define flush_cache_range(vma, start, end)	do { } while (0)

#define flush_cache_page(vma, vmaddr, pfn)	do { } while (0)

#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0

#define flush_dcache_page(page)			do { } while (0)

#define flush_dcache_mmap_lock(mapping)		do { } while (0)

#define flush_dcache_mmap_unlock(mapping)	do { } while (0)

#define flush_icache_range(start, end)		do { } while (0)

#define flush_icache_page(vma,pg)		do { } while (0)

#define flush_icache_user_range(vma,pg,adr,len)	do { } while (0)

#define flush_cache_vmap(start, end)		do { } while (0)

#define flush_cache_vunmap(start, end)		do { } while (0)


#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
	do { \
                memcpy(dst, src, len); \
                flush_icache_user_range(vma, page, vaddr, len); \
        } while (0)

#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
	memcpy(dst, src, len)

#endif /* __ASM_CACHEFLUSH_H */
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Directory: include/asm-generic

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