pgd_list->private = (unsigned long)&page->index; 
set_page_private(pgd_list, (unsigned long)&page->index); 
static inline void pgd_list_add(pgd_t *pgd){	struct page *page = virt_to_page(pgd);	page->index = (unsigned long)pgd_list;	if (pgd_list)		pgd_list->private = (unsigned long)&page->index;	pgd_list = page;	page->private = (unsigned long)&pgd_list;}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/4c21e2f2441dc5fbb957b030333f5a3f2d02dea7/pgtable.c/buggy/arch/i386/mm/pgtable.c