mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
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>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/m68k/mm/sun3mmu.c
|
|
*
|
|
* Implementations of mm routines specific to the sun3 MMU.
|
|
*
|
|
* Moved here 8/20/1999 Sam Creasey
|
|
*
|
|
*/
|
|
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/io.h>
|
|
|
|
extern void mmu_emu_init (unsigned long bootmem_end);
|
|
|
|
const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
|
|
|
|
extern unsigned long num_pages;
|
|
|
|
/* For the sun3 we try to follow the i386 paging_init() more closely */
|
|
/* start_mem and end_mem have PAGE_OFFSET added already */
|
|
/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
|
|
void __init paging_init(void)
|
|
{
|
|
pgd_t * pg_dir;
|
|
pte_t * pg_table;
|
|
int i;
|
|
unsigned long address;
|
|
unsigned long next_pgtable;
|
|
unsigned long bootmem_end;
|
|
unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
|
|
unsigned long size;
|
|
|
|
empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
|
if (!empty_zero_page)
|
|
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
|
|
__func__, PAGE_SIZE, PAGE_SIZE);
|
|
|
|
address = PAGE_OFFSET;
|
|
pg_dir = swapper_pg_dir;
|
|
memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
|
|
memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
|
|
|
|
size = num_pages * sizeof(pte_t);
|
|
size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
|
|
|
|
next_pgtable = (unsigned long)memblock_alloc(size, PAGE_SIZE);
|
|
if (!next_pgtable)
|
|
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
|
|
__func__, size, PAGE_SIZE);
|
|
bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
|
|
|
|
/* Map whole memory from PAGE_OFFSET (0x0E000000) */
|
|
pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
|
|
|
|
while (address < (unsigned long)high_memory) {
|
|
pg_table = (pte_t *) __pa (next_pgtable);
|
|
next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
|
|
pgd_val(*pg_dir) = (unsigned long) pg_table;
|
|
pg_dir++;
|
|
|
|
/* now change pg_table to kernel virtual addresses */
|
|
pg_table = (pte_t *) __va ((unsigned long) pg_table);
|
|
for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
|
|
pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
|
|
if (address >= (unsigned long)high_memory)
|
|
pte_val (pte) = 0;
|
|
set_pte (pg_table, pte);
|
|
address += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
mmu_emu_init(bootmem_end);
|
|
|
|
current->mm = NULL;
|
|
|
|
/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
|
|
max_zone_pfn[ZONE_DMA] = ((unsigned long)high_memory) >> PAGE_SHIFT;
|
|
|
|
/* I really wish I knew why the following change made things better... -- Sam */
|
|
free_area_init(max_zone_pfn);
|
|
|
|
|
|
}
|