1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public 3*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive 4*4882a593Smuzhiyun * for more details. 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun #include <linux/export.h> 7*4882a593Smuzhiyun #include <linux/mm.h> 8*4882a593Smuzhiyun #include <linux/string.h> 9*4882a593Smuzhiyun #include <asm/pgalloc.h> 10*4882a593Smuzhiyun pgd_alloc(struct mm_struct * mm)11*4882a593Smuzhiyunpgd_t *pgd_alloc(struct mm_struct *mm) 12*4882a593Smuzhiyun { 13*4882a593Smuzhiyun pgd_t *ret, *init; 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); 16*4882a593Smuzhiyun if (ret) { 17*4882a593Smuzhiyun init = pgd_offset(&init_mm, 0UL); 18*4882a593Smuzhiyun pgd_init((unsigned long)ret); 19*4882a593Smuzhiyun memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, 20*4882a593Smuzhiyun (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 21*4882a593Smuzhiyun } 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun return ret; 24*4882a593Smuzhiyun } 25*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(pgd_alloc); 26