| /* |
| * arch/arm64/mm/hugetlbpage.c |
| * |
| * Copyright (C) 2013 Linaro Ltd. |
| * |
| * Based on arch/x86/mm/hugetlbpage.c. |
| * |
| * 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, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/mm.h> |
| #include <linux/hugetlb.h> |
| #include <linux/pagemap.h> |
| #include <linux/err.h> |
| #include <linux/sysctl.h> |
| #include <asm/mman.h> |
| #include <asm/tlb.h> |
| #include <asm/tlbflush.h> |
| #include <asm/pgalloc.h> |
| |
| #ifndef CONFIG_ARCH_WANT_HUGE_PMD_SHARE |
| int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
| { |
| return 0; |
| } |
| #endif |
| |
| struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, |
| int write) |
| { |
| return ERR_PTR(-EINVAL); |
| } |
| |
| int pmd_huge(pmd_t pmd) |
| { |
| return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT); |
| } |
| |
| int pud_huge(pud_t pud) |
| { |
| #ifndef __PAGETABLE_PMD_FOLDED |
| return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT); |
| #else |
| return 0; |
| #endif |
| } |
| |
| static __init int setup_hugepagesz(char *opt) |
| { |
| unsigned long ps = memparse(opt, &opt); |
| if (ps == PMD_SIZE) { |
| hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); |
| } else if (ps == PUD_SIZE) { |
| hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); |
| } else { |
| pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); |
| return 0; |
| } |
| return 1; |
| } |
| __setup("hugepagesz=", setup_hugepagesz); |