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mm/highmem: Introduce memcpy_page(), memmove_page(), and memset_page()
3 more common kmap patterns are kmap/memcpy/kunmap, kmap/memmove/kunmap. and kmap/memset/kunmap. Add helper functions for those patterns which use kmap_local_page(). Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Hellwig <hch@infradead.org> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -276,6 +276,39 @@ static inline void copy_highpage(struct page *to, struct page *from)
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#endif
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static inline void memcpy_page(struct page *dst_page, size_t dst_off,
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struct page *src_page, size_t src_off,
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size_t len)
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{
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char *dst = kmap_local_page(dst_page);
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char *src = kmap_local_page(src_page);
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memcpy(dst + dst_off, src + src_off, len);
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kunmap_local(src);
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kunmap_local(dst);
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}
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static inline void memmove_page(struct page *dst_page, size_t dst_off,
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struct page *src_page, size_t src_off,
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size_t len)
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{
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char *dst = kmap_local_page(dst_page);
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char *src = kmap_local_page(src_page);
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memmove(dst + dst_off, src + src_off, len);
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kunmap_local(src);
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kunmap_local(dst);
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}
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static inline void memset_page(struct page *page, size_t offset, int val,
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size_t len)
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{
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char *addr = kmap_local_page(page);
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memset(addr + offset, val, len);
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kunmap_local(addr);
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}
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static inline void memcpy_from_page(char *to, struct page *page,
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size_t offset, size_t len)
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{
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