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ca15ca406f
Patch series "mm: cleanup usage of <asm/pgalloc.h>"
Most architectures have very similar versions of pXd_alloc_one() and
pXd_free_one() for intermediate levels of page table. These patches add
generic versions of these functions in <asm-generic/pgalloc.h> and enable
use of the generic functions where appropriate.
In addition, functions declared and defined in <asm/pgalloc.h> headers are
used mostly by core mm and early mm initialization in arch and there is no
actual reason to have the <asm/pgalloc.h> included all over the place.
The first patch in this series removes unneeded includes of
<asm/pgalloc.h>
In the end it didn't work out as neatly as I hoped and moving
pXd_alloc_track() definitions to <asm-generic/pgalloc.h> would require
unnecessary changes to arches that have custom page table allocations, so
I've decided to move lib/ioremap.c to mm/ and make pgalloc-track.h local
to mm/.
This patch (of 8):
In most cases <asm/pgalloc.h> header is required only for allocations of
page table memory. Most of the .c files that include that header do not
use symbols declared in <asm/pgalloc.h> and do not require that header.
As for the other header files that used to include <asm/pgalloc.h>, it is
possible to move that include into the .c file that actually uses symbols
from <asm/pgalloc.h> and drop the include from the header file.
The process was somewhat automated using
sed -i -E '/[<"]asm\/pgalloc\.h/d' \
$(grep -L -w -f /tmp/xx \
$(git grep -E -l '[<"]asm/pgalloc\.h'))
where /tmp/xx contains all the symbols defined in
arch/*/include/asm/pgalloc.h.
[rppt@linux.ibm.com: fix powerpc warning]
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200627143453.31835-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200627143453.31835-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
159 lines
3.8 KiB
C
159 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/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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