1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #include <asm/shmparam.h>
4 
5 extern void flush_dcache_page(struct page *page);
6 
pages_do_alias(unsigned long addr1,unsigned long addr2)7 static inline unsigned long pages_do_alias(unsigned long addr1,
8 					   unsigned long addr2)
9 {
10 	return (addr1 ^ addr2) & (SHMLBA-1);
11 }
12 
clear_user_page(void * addr,unsigned long vaddr,struct page * page)13 static inline void clear_user_page(void *addr, unsigned long vaddr,
14 				   struct page *page)
15 {
16 	clear_page(addr);
17 	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
18 		flush_dcache_page(page);
19 }
20 
copy_user_page(void * to,void * from,unsigned long vaddr,struct page * page)21 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
22 				  struct page *page)
23 {
24 	copy_page(to, from);
25 	if (pages_do_alias((unsigned long) to, vaddr & PAGE_MASK))
26 		flush_dcache_page(page);
27 }
28