forked from Minki/linux
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>
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
#ifndef _ASM_SCORE_CACHEFLUSH_H
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#define _ASM_SCORE_CACHEFLUSH_H
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/* Keep includes the same across arches. */
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#include <linux/mm.h>
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extern void flush_cache_all(void);
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extern void flush_cache_mm(struct mm_struct *mm);
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extern void flush_cache_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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extern void flush_cache_page(struct vm_area_struct *vma,
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unsigned long page, unsigned long pfn);
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extern void flush_cache_sigtramp(unsigned long addr);
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extern void flush_icache_all(void);
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extern void flush_icache_range(unsigned long start, unsigned long end);
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extern void flush_dcache_range(unsigned long start, unsigned long end);
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#define flush_cache_dup_mm(mm) do {} while (0)
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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
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#define flush_dcache_page(page) do {} while (0)
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#define flush_dcache_mmap_lock(mapping) do {} while (0)
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#define flush_dcache_mmap_unlock(mapping) do {} while (0)
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#define flush_cache_vmap(start, end) do {} while (0)
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#define flush_cache_vunmap(start, end) do {} while (0)
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static inline void flush_icache_page(struct vm_area_struct *vma,
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struct page *page)
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{
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if (vma->vm_flags & VM_EXEC) {
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void *v = page_address(page);
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flush_icache_range((unsigned long) v,
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(unsigned long) v + PAGE_SIZE);
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}
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}
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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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#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
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do { \
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memcpy(dst, src, len); \
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if ((vma->vm_flags & VM_EXEC)) \
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flush_cache_page(vma, vaddr, page_to_pfn(page));\
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} while (0)
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#endif /* _ASM_SCORE_CACHEFLUSH_H */
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