Release 4.14 arch/sh/mm/pgtable.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/mm.h>
#include <linux/slab.h>


#define PGALLOC_GFP GFP_KERNEL | __GFP_ZERO


static struct kmem_cache *pgd_cachep;
#if PAGETABLE_LEVELS > 2

static struct kmem_cache *pmd_cachep;
#endif



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));
}

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void pgtable_cache_init(void)
{
	pgd_cachep = kmem_cache_create("pgd_cache",
				       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
				       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
#if PAGETABLE_LEVELS > 2
	pmd_cachep = kmem_cache_create("pmd_cache",
				       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
				       PAGE_SIZE, SLAB_PANIC, NULL);
#endif
}

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pgd_t *pgd_alloc(struct mm_struct *mm)
{
	return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
}

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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	kmem_cache_free(pgd_cachep, pgd);
}

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#if PAGETABLE_LEVELS > 2


void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	set_pud(pud, __pud((unsigned long)pmd));
}

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pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
	return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
}

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void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
	kmem_cache_free(pmd_cachep, pmd);
}
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#endif /* PAGETABLE_LEVELS > 2 */
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Directory: arch/sh/mm

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