include/linux/highmem.h

22  * Can only be invoked from preemptible task context because on 32bit
68  * Can be invoked from any context, including interrupts.
129  * Context: Can be invoked from any context.
149  * page that might be allocated from high memory (see __GFP_HIGHMEM), for
168  * If you need to map two pages because you want to copy from one page to
217  * VMA at this virtual address.  It may be allocated from highmem or
303 static inline void copy_user_highpage(struct page *to, struct page *from,
308 	vfrom = kmap_local_page(from);
320 static inline void copy_highpage(struct page *to, struct page *from)
324 	vfrom = kmap_local_page(from);
327 	kmsan_copy_page_meta(to, from);
338  * page with #MC in source page (@from) handled, and return the number
341 static inline int copy_mc_user_highpage(struct page *to, struct page *from,
347 	vfrom = kmap_local_page(from);
358 static inline int copy_mc_highpage(struct page *to, struct page *from)
363 	vfrom = kmap_local_page(from);
367 		kmsan_copy_page_meta(to, from);
374 static inline int copy_mc_user_highpage(struct page *to, struct page *from,
377 	copy_user_highpage(to, from, vaddr, vma);
381 static inline int copy_mc_highpage(struct page *to, struct page *from)
383 	copy_highpage(to, from);
414 	char *from = kmap_local_page(page);
417 	memcpy(to, from + offset, len);
418 	kunmap_local(from);
422 				  const char *from, size_t len)
427 	memcpy(to + offset, from, len);
443  * memcpy_from_folio - Copy a range of bytes from a folio.
445  * @folio: The folio to read from.
455 		const char *from = kmap_local_folio(folio, offset);
461 		memcpy(to, from, chunk);
462 		kunmap_local(from);
474  * @from: The memory to copy from.
478 		const char *from, size_t len)
489 		memcpy(to, from, chunk);
492 		from += chunk;
542  * @from: The data to copy.
546  * When they want to copy data from the inode into the page cache, this
551 		const char *from, size_t len)
561 			memcpy(to, from, max);
564 			from += max;
571 	memcpy(to, from, len);
577  * memcpy_from_file_folio - Copy some bytes from a file folio.
579  * @folio: The folio to copy from.
583  * Copy up to @len bytes from this folio.  This may be limited by PAGE_SIZE
584  * if the folio comes from HIGHMEM, and by the size of the folio.
586  * Return: The number of bytes copied from the folio.
592 	char *from = kmap_local_folio(folio, offset);
600 	memcpy(to, from, len);
601 	kunmap_local(from);