diff options
Diffstat (limited to 'include/linux/highmem.h')
| -rw-r--r-- | include/linux/highmem.h | 39 |
1 files changed, 27 insertions, 12 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index c698f8415675..6234f316468c 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -292,12 +292,6 @@ static inline void zero_user_segment(struct page *page, zero_user_segments(page, start, end, 0, 0); } -static inline void zero_user(struct page *page, - unsigned start, unsigned size) -{ - zero_user_segments(page, start, start + size, 0, 0); -} - #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE static inline void copy_user_highpage(struct page *to, struct page *from, @@ -404,6 +398,33 @@ static inline void memcpy_page(struct page *dst_page, size_t dst_off, kunmap_local(dst); } +static inline void memcpy_folio(struct folio *dst_folio, size_t dst_off, + struct folio *src_folio, size_t src_off, size_t len) +{ + VM_BUG_ON(dst_off + len > folio_size(dst_folio)); + VM_BUG_ON(src_off + len > folio_size(src_folio)); + + do { + char *dst = kmap_local_folio(dst_folio, dst_off); + const char *src = kmap_local_folio(src_folio, src_off); + size_t chunk = len; + + if (folio_test_highmem(dst_folio) && + chunk > PAGE_SIZE - offset_in_page(dst_off)) + chunk = PAGE_SIZE - offset_in_page(dst_off); + if (folio_test_highmem(src_folio) && + chunk > PAGE_SIZE - offset_in_page(src_off)) + chunk = PAGE_SIZE - offset_in_page(src_off); + memcpy(dst, src, chunk); + kunmap_local(src); + kunmap_local(dst); + + dst_off += chunk; + src_off += chunk; + len -= chunk; + } while (len > 0); +} + static inline void memset_page(struct page *page, size_t offset, int val, size_t len) { @@ -661,10 +682,4 @@ static inline void folio_release_kmap(struct folio *folio, void *addr) kunmap_local(addr); folio_put(folio); } - -static inline void unmap_and_put_page(struct page *page, void *addr) -{ - folio_release_kmap(page_folio(page), addr); -} - #endif /* _LINUX_HIGHMEM_H */ |