[mirror_ubuntu-zesty-kernel.git] / arch / arm64 / mm / pgd.c

/*
 * PGD allocation/freeing
 *
 * Copyright (C) 2012 ARM Ltd.
 * Author: Catalin Marinas <catalin.marinas@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/mm.h>
#include <linux/gfp.h>
#include <linux/highmem.h>
#include <linux/slab.h>

#include <asm/pgalloc.h>
#include <asm/page.h>
#include <asm/tlbflush.h>

static struct kmem_cache *pgd_cache;

pgd_t *pgd_alloc(struct mm_struct *mm)
{
	if (PGD_SIZE == PAGE_SIZE)
		return (pgd_t *)__get_free_page(PGALLOC_GFP);
	else
		return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
}

void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	if (PGD_SIZE == PAGE_SIZE)
		free_page((unsigned long)pgd);
	else
		kmem_cache_free(pgd_cache, pgd);
}

void __init pgd_cache_init(void)
{
	if (PGD_SIZE == PAGE_SIZE)
		return;

	/*
	 * Naturally aligned pgds required by the architecture.
	 */
	pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE,
				      SLAB_PANIC, NULL);
}
Commit	Line	Data
1d18c47c CM	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
2a0b5c0d CM	29	static struct kmem_cache *pgd_cache;
2a0b5c0d CM	30
1d18c47c CM	31	pgd_t pgd_alloc(struct mm_struct mm)
1d18c47c CM	32	{
1d18c47c	33	if (PGD_SIZE == PAGE_SIZE)
15670ef1	34	return (pgd_t *)__get_free_page(PGALLOC_GFP);
1d18c47c	35	else
15670ef1	36	return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
1d18c47c CM	37	}
	38
	39	void pgd_free(struct mm_struct mm, pgd_t pgd)
	40	{
	41	if (PGD_SIZE == PAGE_SIZE)
	42	free_page((unsigned long)pgd);
	43	else
2a0b5c0d CM	44	kmem_cache_free(pgd_cache, pgd);
	45	}
	46
39b5be9b	47	void __init pgd_cache_init(void)
2a0b5c0d	48	{
39b5be9b WD	49	if (PGD_SIZE == PAGE_SIZE)
	50	return;
	51
2a0b5c0d CM	52	/*
	53	* Naturally aligned pgds required by the architecture.
	54	*/
39b5be9b WD	55	pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE,
39b5be9b WD	56	SLAB_PANIC, NULL);
1d18c47c	57	}