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9e1b32caa5
mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
Upcoming paches to support the new 64-bit "BookE" powerpc architecture
will need to have the virtual address corresponding to PTE page when
freeing it, due to the way the HW table walker works.
Basically, the TLB can be loaded with "large" pages that cover the whole
virtual space (well, sort-of, half of it actually) represented by a PTE
page, and which contain an "indirect" bit indicating that this TLB entry
RPN points to an array of PTEs from which the TLB can then create direct
entries. Thus, in order to invalidate those when PTE pages are deleted,
we need the virtual address to pass to tlbilx or tlbivax instructions.
The old trick of sticking it somewhere in the PTE page struct page sucks
too much, the address is almost readily available in all call sites and
almost everybody implemets these as macros, so we may as well add the
argument everywhere. I added it to the pmd and pud variants for consistency.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: David Howells <dhowells@redhat.com> [MN10300 & FRV]
Acked-by: Nick Piggin <npiggin@suse.de>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [s390]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* MN10300 Page and page table/directory allocation
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_PGALLOC_H
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#define _ASM_PGALLOC_H
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <linux/threads.h>
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#include <linux/mm.h> /* for struct page */
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struct mm_struct;
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struct page;
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/* attach a page table to a PMD entry */
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#define pmd_populate_kernel(mm, pmd, pte) \
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set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE))
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static inline
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void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
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{
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set_pmd(pmd, __pmd((page_to_pfn(pte) << PAGE_SHIFT) | _PAGE_TABLE));
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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/*
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* Allocate and free page tables.
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*/
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extern pgd_t *pgd_alloc(struct mm_struct *);
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extern void pgd_free(struct mm_struct *, pgd_t *);
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extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
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extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_page((unsigned long) pte);
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}
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static inline void pte_free(struct mm_struct *mm, struct page *pte)
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{
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__free_page(pte);
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}
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#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
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#endif /* _ASM_PGALLOC_H */
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