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Directory :  /lib/modules/3.13.0-49-generic/build/arch/avr32/include/asm/

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Current File : /lib/modules/3.13.0-49-generic/build/arch/avr32/include/asm/pgalloc.h
/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * 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.
 */
#ifndef __ASM_AVR32_PGALLOC_H
#define __ASM_AVR32_PGALLOC_H

#include <linux/mm.h>
#include <linux/quicklist.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#define QUICK_PGD	0	/* Preserve kernel mappings over free */
#define QUICK_PT	1	/* Zero on free */

static inline void pmd_populate_kernel(struct mm_struct *mm,
				       pmd_t *pmd, pte_t *pte)
{
	set_pmd(pmd, __pmd((unsigned long)pte));
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
				    pgtable_t pte)
{
	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
}
#define pmd_pgtable(pmd) pmd_page(pmd)

static inline void pgd_ctor(void *x)
{
	pgd_t *pgd = x;

	memcpy(pgd + USER_PTRS_PER_PGD,
		swapper_pg_dir + USER_PTRS_PER_PGD,
		(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}

/*
 * Allocate and free page tables
 */
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	quicklist_free(QUICK_PGD, NULL, pgd);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
					  unsigned long address)
{
	return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
}

static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
					 unsigned long address)
{
	struct page *page;
	void *pg;

	pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
	if (!pg)
		return NULL;

	page = virt_to_page(pg);
	if (!pgtable_page_ctor(page)) {
		quicklist_free(QUICK_PT, NULL, pg);
		return NULL;
	}

	return page;
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
	quicklist_free(QUICK_PT, NULL, pte);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
{
	pgtable_page_dtor(pte);
	quicklist_free_page(QUICK_PT, NULL, pte);
}

#define __pte_free_tlb(tlb,pte,addr)			\
do {							\
	pgtable_page_dtor(pte);				\
	tlb_remove_page((tlb), pte);			\
} while (0)

static inline void check_pgt_cache(void)
{
	quicklist_trim(QUICK_PGD, NULL, 25, 16);
	quicklist_trim(QUICK_PT, NULL, 25, 16);
}

#endif /* __ASM_AVR32_PGALLOC_H */

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