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2d4dc890b5
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>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/*
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* (C) Copyright 2002, Yoshinori Sato <ysato@users.sourceforge.jp>
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*/
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#ifndef _ASM_H8300_CACHEFLUSH_H
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#define _ASM_H8300_CACHEFLUSH_H
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/*
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* Cache handling functions
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* No Cache memory all dummy functions
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*/
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#define flush_cache_all()
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#define flush_cache_mm(mm)
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#define flush_cache_dup_mm(mm) do { } while (0)
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#define flush_cache_range(vma,a,b)
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#define flush_cache_page(vma,p,pfn)
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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
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#define flush_dcache_page(page)
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#define flush_dcache_mmap_lock(mapping)
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#define flush_dcache_mmap_unlock(mapping)
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#define flush_icache()
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#define flush_icache_page(vma,page)
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#define flush_icache_range(start,len)
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#define flush_cache_vmap(start, end)
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#define flush_cache_vunmap(start, end)
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#define cache_push_v(vaddr,len)
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#define cache_push(paddr,len)
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#define cache_clear(paddr,len)
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#define flush_dcache_range(a,b)
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#define flush_icache_user_range(vma,page,addr,len)
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#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
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memcpy(dst, src, len)
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#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
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memcpy(dst, src, len)
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#endif /* _ASM_H8300_CACHEFLUSH_H */
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