mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-24 03:24:55 +08:00
aba677f94b
Function set_pmd_at is to set pmd entry, if tlb entry need to be flushed, there exists pmdp_huge_clear_flush alike function before set_pmd_at is called. So it is not necessary to call flush_tlb_all in this function. In these scenarios, tlb for the pmd range needs to be flushed: - privilege degrade such as wrprotect is set on the pmd entry - pmd entry is cleared - there is exception if set_pmd_at is issued by dup_mmap, since flush_tlb_mm is called for parent process, it is not necessary to flush tlb in function copy_huge_pmd. Link: http://lkml.kernel.org/r/1592990792-1923-3-git-send-email-maobibo@loongson.cn Signed-off-by: Bibo Mao <maobibo@loongson.cn> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Daniel Silsby <dansilsby@gmail.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2003 by Ralf Baechle
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/highmem.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
void pgd_init(unsigned long page)
|
|
{
|
|
unsigned long *p = (unsigned long *) page;
|
|
int i;
|
|
|
|
for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
|
|
p[i + 0] = (unsigned long) invalid_pte_table;
|
|
p[i + 1] = (unsigned long) invalid_pte_table;
|
|
p[i + 2] = (unsigned long) invalid_pte_table;
|
|
p[i + 3] = (unsigned long) invalid_pte_table;
|
|
p[i + 4] = (unsigned long) invalid_pte_table;
|
|
p[i + 5] = (unsigned long) invalid_pte_table;
|
|
p[i + 6] = (unsigned long) invalid_pte_table;
|
|
p[i + 7] = (unsigned long) invalid_pte_table;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
|
|
pmd_t mk_pmd(struct page *page, pgprot_t prot)
|
|
{
|
|
pmd_t pmd;
|
|
|
|
pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
|
|
|
|
return pmd;
|
|
}
|
|
|
|
|
|
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
|
|
pmd_t *pmdp, pmd_t pmd)
|
|
{
|
|
*pmdp = pmd;
|
|
}
|
|
#endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
|
|
|
|
void __init pagetable_init(void)
|
|
{
|
|
unsigned long vaddr;
|
|
pgd_t *pgd_base;
|
|
#ifdef CONFIG_HIGHMEM
|
|
pgd_t *pgd;
|
|
p4d_t *p4d;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
#endif
|
|
|
|
/* Initialize the entire pgd. */
|
|
pgd_init((unsigned long)swapper_pg_dir);
|
|
pgd_init((unsigned long)swapper_pg_dir
|
|
+ sizeof(pgd_t) * USER_PTRS_PER_PGD);
|
|
|
|
pgd_base = swapper_pg_dir;
|
|
|
|
/*
|
|
* Fixed mappings:
|
|
*/
|
|
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
|
|
fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/*
|
|
* Permanent kmaps:
|
|
*/
|
|
vaddr = PKMAP_BASE;
|
|
fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
|
|
|
|
pgd = swapper_pg_dir + pgd_index(vaddr);
|
|
p4d = p4d_offset(pgd, vaddr);
|
|
pud = pud_offset(p4d, vaddr);
|
|
pmd = pmd_offset(pud, vaddr);
|
|
pte = pte_offset_kernel(pmd, vaddr);
|
|
pkmap_page_table = pte;
|
|
#endif
|
|
}
|