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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a349b30250
pgd_cache is setup once while init stage and never changed after that, so it is good candidate for __ro_after_init Signed-off-by: Jinbum Park <jinb.park7@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* PGD allocation/freeing
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*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Catalin Marinas <catalin.marinas@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/mm.h>
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#include <linux/gfp.h>
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#include <linux/highmem.h>
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#include <linux/slab.h>
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#include <asm/pgalloc.h>
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#include <asm/page.h>
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#include <asm/tlbflush.h>
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static struct kmem_cache *pgd_cache __ro_after_init;
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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if (PGD_SIZE == PAGE_SIZE)
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return (pgd_t *)__get_free_page(PGALLOC_GFP);
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else
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return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
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}
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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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if (PGD_SIZE == PAGE_SIZE)
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free_page((unsigned long)pgd);
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else
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kmem_cache_free(pgd_cache, pgd);
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}
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void __init pgd_cache_init(void)
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{
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if (PGD_SIZE == PAGE_SIZE)
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return;
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/*
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* Naturally aligned pgds required by the architecture.
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*/
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pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE,
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SLAB_PANIC, NULL);
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}
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