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e31cf2f4ca
Patch series "mm: consolidate definitions of page table accessors", v2.
The low level page table accessors (pXY_index(), pXY_offset()) are
duplicated across all architectures and sometimes more than once. For
instance, we have 31 definition of pgd_offset() for 25 supported
architectures.
Most of these definitions are actually identical and typically it boils
down to, e.g.
static inline unsigned long pmd_index(unsigned long address)
{
return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
}
static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}
These definitions can be shared among 90% of the arches provided
XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined.
For architectures that really need a custom version there is always
possibility to override the generic version with the usual ifdefs magic.
These patches introduce include/linux/pgtable.h that replaces
include/asm-generic/pgtable.h and add the definitions of the page table
accessors to the new header.
This patch (of 12):
The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the
functions involving page table manipulations, e.g. pte_alloc() and
pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h>
in the files that include <linux/mm.h>.
The include statements in such cases are remove with a simple loop:
for f in $(git grep -l "include <linux/mm.h>") ; do
sed -i -e '/include <asm\/pgtable.h>/ d' $f
done
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* This file contains pgtable related functions for 64-bit machines.
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*
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* Derived from arch/ppc64/mm/init.c
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* Dave Engebretsen <engebret@us.ibm.com>
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* Rework for PPC64 port.
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/stddef.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/hugetlb.h>
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#include <asm/pgalloc.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/mmu_context.h>
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#include <asm/mmu.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/tlb.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/firmware.h>
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#include <asm/dma.h>
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#include <mm/mmu_decl.h>
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* partition table and process table for ISA 3.0
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*/
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struct prtb_entry *process_tb;
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struct patb_entry *partition_tb;
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/*
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* page table size
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*/
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unsigned long __pte_index_size;
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EXPORT_SYMBOL(__pte_index_size);
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unsigned long __pmd_index_size;
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EXPORT_SYMBOL(__pmd_index_size);
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unsigned long __pud_index_size;
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EXPORT_SYMBOL(__pud_index_size);
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unsigned long __pgd_index_size;
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EXPORT_SYMBOL(__pgd_index_size);
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unsigned long __pud_cache_index;
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EXPORT_SYMBOL(__pud_cache_index);
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unsigned long __pte_table_size;
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EXPORT_SYMBOL(__pte_table_size);
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unsigned long __pmd_table_size;
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EXPORT_SYMBOL(__pmd_table_size);
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unsigned long __pud_table_size;
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EXPORT_SYMBOL(__pud_table_size);
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unsigned long __pgd_table_size;
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EXPORT_SYMBOL(__pgd_table_size);
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unsigned long __pmd_val_bits;
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EXPORT_SYMBOL(__pmd_val_bits);
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unsigned long __pud_val_bits;
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EXPORT_SYMBOL(__pud_val_bits);
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unsigned long __pgd_val_bits;
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EXPORT_SYMBOL(__pgd_val_bits);
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unsigned long __kernel_virt_start;
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EXPORT_SYMBOL(__kernel_virt_start);
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unsigned long __vmalloc_start;
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EXPORT_SYMBOL(__vmalloc_start);
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unsigned long __vmalloc_end;
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EXPORT_SYMBOL(__vmalloc_end);
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unsigned long __kernel_io_start;
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EXPORT_SYMBOL(__kernel_io_start);
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unsigned long __kernel_io_end;
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struct page *vmemmap;
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EXPORT_SYMBOL(vmemmap);
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unsigned long __pte_frag_nr;
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EXPORT_SYMBOL(__pte_frag_nr);
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unsigned long __pte_frag_size_shift;
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EXPORT_SYMBOL(__pte_frag_size_shift);
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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/* 4 level page table */
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struct page *p4d_page(p4d_t p4d)
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{
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if (p4d_is_leaf(p4d)) {
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VM_WARN_ON(!p4d_huge(p4d));
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return pte_page(p4d_pte(p4d));
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}
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return virt_to_page(p4d_page_vaddr(p4d));
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}
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#endif
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struct page *pud_page(pud_t pud)
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{
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if (pud_is_leaf(pud)) {
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VM_WARN_ON(!pud_huge(pud));
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return pte_page(pud_pte(pud));
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}
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return virt_to_page(pud_page_vaddr(pud));
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}
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/*
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* For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
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* For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
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*/
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struct page *pmd_page(pmd_t pmd)
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{
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if (pmd_is_leaf(pmd)) {
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VM_WARN_ON(!(pmd_large(pmd) || pmd_huge(pmd)));
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return pte_page(pmd_pte(pmd));
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}
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return virt_to_page(pmd_page_vaddr(pmd));
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}
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#ifdef CONFIG_STRICT_KERNEL_RWX
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void mark_rodata_ro(void)
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{
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if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) {
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pr_warn("Warning: Unable to mark rodata read only on this CPU.\n");
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return;
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}
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if (radix_enabled())
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radix__mark_rodata_ro();
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else
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hash__mark_rodata_ro();
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// mark_initmem_nx() should have already run by now
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ptdump_check_wx();
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}
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void mark_initmem_nx(void)
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{
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if (radix_enabled())
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radix__mark_initmem_nx();
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else
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hash__mark_initmem_nx();
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}
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#endif
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