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b27873702b
With new refcounting we don't need to mark PMDs splitting. Let's drop code to handle this. pmdp_splitting_flush() is not needed too: on splitting PMD we will do pmdp_clear_flush() + set_pte_at(). pmdp_clear_flush() will do IPI as needed for fast_gup. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Steve Capper <steve.capper@linaro.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1999, 2000 by Silicon Graphics
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* Copyright (C) 2003 by Ralf Baechle
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <asm/fixmap.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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void pgd_init(unsigned long page)
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{
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unsigned long *p, *end;
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unsigned long entry;
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#ifdef __PAGETABLE_PMD_FOLDED
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entry = (unsigned long)invalid_pte_table;
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#else
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entry = (unsigned long)invalid_pmd_table;
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#endif
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p = (unsigned long *) page;
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end = p + PTRS_PER_PGD;
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do {
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p[0] = entry;
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p[1] = entry;
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p[2] = entry;
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p[3] = entry;
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p[4] = entry;
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p += 8;
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p[-3] = entry;
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p[-2] = entry;
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p[-1] = entry;
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} while (p != end);
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}
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#ifndef __PAGETABLE_PMD_FOLDED
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void pmd_init(unsigned long addr, unsigned long pagetable)
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{
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unsigned long *p, *end;
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p = (unsigned long *) addr;
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end = p + PTRS_PER_PMD;
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do {
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p[0] = pagetable;
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p[1] = pagetable;
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p[2] = pagetable;
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p[3] = pagetable;
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p[4] = pagetable;
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p += 8;
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p[-3] = pagetable;
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p[-2] = pagetable;
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p[-1] = pagetable;
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} while (p != end);
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}
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#endif
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pmd_t mk_pmd(struct page *page, pgprot_t prot)
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{
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pmd_t pmd;
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pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
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return pmd;
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}
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void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd)
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{
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*pmdp = pmd;
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flush_tlb_all();
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}
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void __init pagetable_init(void)
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{
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unsigned long vaddr;
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pgd_t *pgd_base;
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/* Initialize the entire pgd. */
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pgd_init((unsigned long)swapper_pg_dir);
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
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#endif
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pgd_base = swapper_pg_dir;
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/*
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* Fixed mappings:
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*/
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vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
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fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
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}
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