mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
be74273aee
The pgd kmem_cache allocation both specified __GFP_ZERO and had a constructor which makes no sense. Remove __GFP_ZERO and zero the user parts of the pgd explicitly. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Rich Felker <dalias@libc.org>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
|
|
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;
|
|
|
|
memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
|
|
memcpy(pgd + USER_PTRS_PER_PGD,
|
|
swapper_pg_dir + USER_PTRS_PER_PGD,
|
|
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
return kmem_cache_alloc(pgd_cachep, GFP_KERNEL);
|
|
}
|
|
|
|
void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
kmem_cache_free(pgd_cachep, pgd);
|
|
}
|
|
|
|
#if PAGETABLE_LEVELS > 2
|
|
void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
|
|
{
|
|
set_pud(pud, __pud((unsigned long)pmd));
|
|
}
|
|
|
|
pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
|
|
{
|
|
return kmem_cache_alloc(pmd_cachep, GFP_KERNEL | __GFP_ZERO);
|
|
}
|
|
|
|
void pmd_free(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
kmem_cache_free(pmd_cachep, pmd);
|
|
}
|
|
#endif /* PAGETABLE_LEVELS > 2 */
|