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mm/highmem: Introduce memcpy_page(), memmove_page(), and memset_page()

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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>
This commit is contained in:
Ira Weiny 2021-02-09 22:22:16 -08:00 committed by David Sterba
parent 61b205f579
commit 6a0996db68
1 changed files with 33 additions and 0 deletions
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33
include/linux/highmem.h
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@ -276,6 +276,39 @@ static inline void copy_highpage(struct page *to, struct page *from)
#endif
static inline void memcpy_page(struct page *dst_page, size_t dst_off,
struct page *src_page, size_t src_off,
size_t len)
{
char *dst = kmap_local_page(dst_page);
char *src = kmap_local_page(src_page);
memcpy(dst + dst_off, src + src_off, len);
kunmap_local(src);
kunmap_local(dst);
}
static inline void memmove_page(struct page *dst_page, size_t dst_off,
struct page *src_page, size_t src_off,
size_t len)
{
char *dst = kmap_local_page(dst_page);
char *src = kmap_local_page(src_page);
memmove(dst + dst_off, src + src_off, len);
kunmap_local(src);
kunmap_local(dst);
}
static inline void memset_page(struct page *page, size_t offset, int val,
size_t len)
{
char *addr = kmap_local_page(page);
memset(addr + offset, val, len);
kunmap_local(addr);
}
static inline void memcpy_from_page(char *to, struct page *page,
size_t offset, size_t len)
{