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Linux/arch/arm64/mm/pgd.c

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  1 /*
  2  * PGD allocation/freeing
  3  *
  4  * Copyright (C) 2012 ARM Ltd.
  5  * Author: Catalin Marinas <catalin.marinas@arm.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 18  */
 19 
 20 #include <linux/mm.h>
 21 #include <linux/gfp.h>
 22 #include <linux/highmem.h>
 23 #include <linux/slab.h>
 24 
 25 #include <asm/pgalloc.h>
 26 #include <asm/page.h>
 27 #include <asm/tlbflush.h>
 28 
 29 #include "mm.h"
 30 
 31 #define PGD_SIZE        (PTRS_PER_PGD * sizeof(pgd_t))
 32 
 33 pgd_t *pgd_alloc(struct mm_struct *mm)
 34 {
 35         pgd_t *new_pgd;
 36 
 37         if (PGD_SIZE == PAGE_SIZE)
 38                 new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
 39         else
 40                 new_pgd = kzalloc(PGD_SIZE, GFP_KERNEL);
 41 
 42         if (!new_pgd)
 43                 return NULL;
 44 
 45         return new_pgd;
 46 }
 47 
 48 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 49 {
 50         if (PGD_SIZE == PAGE_SIZE)
 51                 free_page((unsigned long)pgd);
 52         else
 53                 kfree(pgd);
 54 }
 55 

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