clear_user_page    32 include/asm-parisc/page.h void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
clear_user_page   139 include/asm-xtensa/page.h extern void clear_user_page(void*, unsigned long, struct page*);
clear_user_page    69 include/linux/highmem.h 	clear_user_page(addr, vaddr, page);