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linux/arch/h8300/include/asm/cacheflush.h
Ilya Loginov 2d4dc890b5 block: add helpers to run flush_dcache_page() against a bio and a request's pages
Mtdblock driver doesn't call flush_dcache_page for pages in request.  So,
this causes problems on architectures where the icache doesn't fill from
the dcache or with dcache aliases.  The patch fixes this.

The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid
pointless empty cache-thrashing loops on architectures for which
flush_dcache_page() is a no-op.  Every architecture was provided with this
flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is
equal 1 or do nothing otherwise.

See "fix mtd_blkdevs problem with caches on some architectures" discussion
on LKML for more information.

Signed-off-by: Ilya Loginov <isloginov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Peter Horton <phorton@bitbox.co.uk>
Cc: "Ed L. Cashin" <ecashin@coraid.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-11-26 09:16:19 +01:00

41 lines
1.1 KiB
C

/*
* (C) Copyright 2002, Yoshinori Sato <ysato@users.sourceforge.jp>
*/
#ifndef _ASM_H8300_CACHEFLUSH_H
#define _ASM_H8300_CACHEFLUSH_H
/*
* Cache handling functions
* No Cache memory all dummy functions
*/
#define flush_cache_all()
#define flush_cache_mm(mm)
#define flush_cache_dup_mm(mm) do { } while (0)
#define flush_cache_range(vma,a,b)
#define flush_cache_page(vma,p,pfn)
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
#define flush_dcache_page(page)
#define flush_dcache_mmap_lock(mapping)
#define flush_dcache_mmap_unlock(mapping)
#define flush_icache()
#define flush_icache_page(vma,page)
#define flush_icache_range(start,len)
#define flush_cache_vmap(start, end)
#define flush_cache_vunmap(start, end)
#define cache_push_v(vaddr,len)
#define cache_push(paddr,len)
#define cache_clear(paddr,len)
#define flush_dcache_range(a,b)
#define flush_icache_user_range(vma,page,addr,len)
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
#endif /* _ASM_H8300_CACHEFLUSH_H */