inc/abi/page.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002
0003 #include <asm/shmparam.h>
0004
0005 extern void flush_dcache_page(struct page *page);
0006
0007 static inline unsigned long pages_do_alias(unsigned long addr1,
0008                        unsigned long addr2)
0009 {
0010     return (addr1 ^ addr2) & (SHMLBA-1);
0011 }
0012
0013 static inline void clear_user_page(void *addr, unsigned long vaddr,
0014                    struct page *page)
0015 {
0016     clear_page(addr);
0017     if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
0018         flush_dcache_page(page);
0019 }
0020
0021 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
0022                   struct page *page)
0023 {
0024     copy_page(to, from);
0025     if (pages_do_alias((unsigned long) to, vaddr & PAGE_MASK))
0026         flush_dcache_page(page);
0027 }