mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 08:02:07 +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>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
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.
|
|
*
|
|
* Copyright (C) 2003 by Ralf Baechle
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/highmem.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
void pgd_init(unsigned long page)
|
|
{
|
|
unsigned long *p = (unsigned long *) page;
|
|
int i;
|
|
|
|
for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
|
|
p[i + 0] = (unsigned long) invalid_pte_table;
|
|
p[i + 1] = (unsigned long) invalid_pte_table;
|
|
p[i + 2] = (unsigned long) invalid_pte_table;
|
|
p[i + 3] = (unsigned long) invalid_pte_table;
|
|
p[i + 4] = (unsigned long) invalid_pte_table;
|
|
p[i + 5] = (unsigned long) invalid_pte_table;
|
|
p[i + 6] = (unsigned long) invalid_pte_table;
|
|
p[i + 7] = (unsigned long) invalid_pte_table;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
|
|
pmd_t mk_pmd(struct page *page, pgprot_t prot)
|
|
{
|
|
pmd_t pmd;
|
|
|
|
pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
|
|
|
|
return pmd;
|
|
}
|
|
|
|
|
|
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
|
|
pmd_t *pmdp, pmd_t pmd)
|
|
{
|
|
*pmdp = pmd;
|
|
flush_tlb_all();
|
|
}
|
|
#endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
|
|
|
|
void __init pagetable_init(void)
|
|
{
|
|
unsigned long vaddr;
|
|
pgd_t *pgd_base;
|
|
#ifdef CONFIG_HIGHMEM
|
|
pgd_t *pgd;
|
|
p4d_t *p4d;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
#endif
|
|
|
|
/* Initialize the entire pgd. */
|
|
pgd_init((unsigned long)swapper_pg_dir);
|
|
pgd_init((unsigned long)swapper_pg_dir
|
|
+ sizeof(pgd_t) * USER_PTRS_PER_PGD);
|
|
|
|
pgd_base = swapper_pg_dir;
|
|
|
|
/*
|
|
* Fixed mappings:
|
|
*/
|
|
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
|
|
fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/*
|
|
* Permanent kmaps:
|
|
*/
|
|
vaddr = PKMAP_BASE;
|
|
fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
|
|
|
|
pgd = swapper_pg_dir + pgd_index(vaddr);
|
|
p4d = p4d_offset(pgd, vaddr);
|
|
pud = pud_offset(p4d, vaddr);
|
|
pmd = pmd_offset(pud, vaddr);
|
|
pte = pte_offset_kernel(pmd, vaddr);
|
|
pkmap_page_table = pte;
|
|
#endif
|
|
}
|