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>
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2013 Altera Corporation
|
|
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
|
|
* Copyright (C) 2009 Wind River Systems Inc
|
|
* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
|
|
* Copyright (C) 2004 Microtronix Datacom Ltd
|
|
*
|
|
* based on arch/m68k/mm/init.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.
|
|
*/
|
|
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/binfmts.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/page.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/cpuinfo.h>
|
|
#include <asm/processor.h>
|
|
|
|
pgd_t *pgd_current;
|
|
|
|
/*
|
|
* paging_init() continues the virtual memory environment setup which
|
|
* was begun by the code in arch/head.S.
|
|
* The parameters are pointers to where to stick the starting and ending
|
|
* addresses of available kernel virtual memory.
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
|
|
|
|
pagetable_init();
|
|
pgd_current = swapper_pg_dir;
|
|
|
|
max_zone_pfn[ZONE_NORMAL] = max_mapnr;
|
|
|
|
/* pass the memory from the bootmem allocator to the main allocator */
|
|
free_area_init(max_zone_pfn);
|
|
|
|
flush_dcache_range((unsigned long)empty_zero_page,
|
|
(unsigned long)empty_zero_page + PAGE_SIZE);
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
unsigned long end_mem = memory_end; /* this must not include
|
|
kernel stack at top */
|
|
|
|
pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
|
|
|
|
end_mem &= PAGE_MASK;
|
|
high_memory = __va(end_mem);
|
|
|
|
/* this will put all memory onto the freelists */
|
|
memblock_free_all();
|
|
mem_init_print_info(NULL);
|
|
}
|
|
|
|
void __init mmu_init(void)
|
|
{
|
|
flush_tlb_all();
|
|
}
|
|
|
|
#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
|
|
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
|
|
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
|
|
static struct page *kuser_page[1];
|
|
|
|
static int alloc_kuser_page(void)
|
|
{
|
|
extern char __kuser_helper_start[], __kuser_helper_end[];
|
|
int kuser_sz = __kuser_helper_end - __kuser_helper_start;
|
|
unsigned long vpage;
|
|
|
|
vpage = get_zeroed_page(GFP_ATOMIC);
|
|
if (!vpage)
|
|
return -ENOMEM;
|
|
|
|
/* Copy kuser helpers */
|
|
memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
|
|
|
|
flush_icache_range(vpage, vpage + KUSER_SIZE);
|
|
kuser_page[0] = virt_to_page(vpage);
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(alloc_kuser_page);
|
|
|
|
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
|
|
{
|
|
struct mm_struct *mm = current->mm;
|
|
int ret;
|
|
|
|
down_write(&mm->mmap_sem);
|
|
|
|
/* Map kuser helpers to user space address */
|
|
ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
|
|
VM_READ | VM_EXEC | VM_MAYREAD |
|
|
VM_MAYEXEC, kuser_page);
|
|
|
|
up_write(&mm->mmap_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
const char *arch_vma_name(struct vm_area_struct *vma)
|
|
{
|
|
return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
|
|
}
|