clear_user_highpage
extern void clear_user_highpage(struct page *page, unsigned long vaddr);
#define clear_user_highpage clear_user_highpage
EXPORT_SYMBOL(clear_user_highpage);
#define clear_user_highpage clear_user_highpage
void clear_user_highpage(struct page *page, unsigned long vaddr);
EXPORT_SYMBOL(clear_user_highpage);
clear_user_highpage(vmf->cow_page, vmf->address);
#ifndef clear_user_highpage
#if defined(clear_user_highpage) || defined(CONFIG_HIGHMEM)
clear_user_highpage(page, vaddr);
clear_user_highpage(&folio->page, vaddr);
clear_user_highpage(page, src_addr);
clear_user_highpage(&folio->page, dst_addr);