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mm: pgtable: add shortcuts for accessing kernel PMD and PTE 

The powerpc 32-bit implementation of pgtable has nice shortcuts for
accessing kernel PMD and PTE for a given virtual address.  Make these
helpers available for all architectures.

[rppt@linux.ibm.com: microblaze: fix page table traversal in setup_rt_frame()]
  Link: http://lkml.kernel.org/r/20200518191511.GD1118872@kernel.org
[akpm@linux-foundation.org: s/pmd_ptr_k/pmd_off_k/ in various powerpc places]

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: 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/20200514170327.31389-9-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport 2020-06-08 21:33:05 -07:00 committed by Linus Torvalds
parent 88107d330d
commit e05c7b1f2b
44 changed files with 79 additions and 294 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/arc/mm/highmem.c
View File

@ -92,17 +92,9 @@ EXPORT_SYMBOL(kunmap_atomic_high);
static noinline pte_t * __init alloc_kmap_pgtable(unsigned long kvaddr)
{
pgd_t *pgd_k;
p4d_t *p4d_k;
pud_t *pud_k;
pmd_t *pmd_k;
pmd_t *pmd_k = pmd_off_k(kvaddr);
pte_t *pte_k;
pgd_k = pgd_offset_k(kvaddr);
p4d_k = p4d_offset(pgd_k, kvaddr);
pud_k = pud_offset(p4d_k, kvaddr);
pmd_k = pmd_offset(pud_k, kvaddr);
pte_k = (pte_t *)memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
if (!pte_k)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",

2
arch/arm/mach-sa1100/assabet.c
View File

@ -632,7 +632,7 @@ static void __init map_sa1100_gpio_regs( void )
int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
pmd_t *pmd;
pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(virt), virt), virt), virt);
pmd = pmd_off_k(virt);
*pmd = __pmd(phys | prot);
flush_pmd_entry(pmd);
}

4
arch/arm/mm/highmem.c
View File

@ -18,7 +18,7 @@
static inline void set_fixmap_pte(int idx, pte_t pte)
{
unsigned long vaddr = __fix_to_virt(idx);
pte_t *ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
pte_t *ptep = virt_to_kpte(vaddr);
set_pte_ext(ptep, pte, 0);
local_flush_tlb_kernel_page(vaddr);
@ -26,7 +26,7 @@ static inline void set_fixmap_pte(int idx, pte_t pte)
static inline pte_t get_fixmap_pte(unsigned long vaddr)
{
pte_t *ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
pte_t *ptep = virt_to_kpte(vaddr);
return *ptep;
}

29
arch/arm/mm/ioremap.c
View File

@ -141,16 +141,8 @@ void __check_vmalloc_seq(struct mm_struct *mm)
static void unmap_area_sections(unsigned long virt, unsigned long size)
{
unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmdp;
pmd_t *pmdp = pmd_off_k(addr);
flush_cache_vunmap(addr, end);
pgd = pgd_offset_k(addr);
p4d = p4d_offset(pgd, addr);
pud = pud_offset(p4d, addr);
pmdp = pmd_offset(pud, addr);
do {
pmd_t pmd = *pmdp;
@ -191,10 +183,7 @@ remap_area_sections(unsigned long virt, unsigned long pfn,
size_t size, const struct mem_type *type)
{
unsigned long addr = virt, end = virt + size;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pmd_t *pmd = pmd_off_k(addr);
/*
* Remove and free any PTE-based mapping, and
@ -202,10 +191,6 @@ remap_area_sections(unsigned long virt, unsigned long pfn,
*/
unmap_area_sections(virt, size);
pgd = pgd_offset_k(addr);
p4d = p4d_offset(pgd, addr);
pud = pud_offset(p4d, addr);
pmd = pmd_offset(pud, addr);
do {
pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
pfn += SZ_1M >> PAGE_SHIFT;
@ -225,21 +210,13 @@ remap_area_supersections(unsigned long virt, unsigned long pfn,
size_t size, const struct mem_type *type)
{
unsigned long addr = virt, end = virt + size;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pmd_t *pmd = pmd_off_k(addr);
/*
* Remove and free any PTE-based mapping, and
* sync the current kernel mapping.
*/
unmap_area_sections(virt, size);
pgd = pgd_offset_k(virt);
p4d = p4d_offset(pgd, addr);
pud = pud_offset(p4d, addr);
pmd = pmd_offset(pud, addr);
do {
unsigned long super_pmd_val, i;

5
arch/arm/mm/mm.h
View File

@ -35,11 +35,6 @@ static inline pte_t get_top_pte(unsigned long va)
return *ptep;
}
static inline pmd_t *pmd_off_k(unsigned long virt)
{
return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(virt), virt), virt), virt);
}
struct mem_type {
pteval_t prot_pte;
pteval_t prot_pte_s2;

7
arch/arm/mm/mmu.c
View File

@ -356,12 +356,7 @@ static pte_t *pte_offset_late_fixmap(pmd_t *dir, unsigned long addr)
static inline pmd_t * __init fixmap_pmd(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
p4d_t *p4d = p4d_offset(pgd, addr);
pud_t *pud = pud_offset(p4d, addr);
pmd_t *pmd = pmd_offset(pud, addr);
return pmd;
return pmd_off_k(addr);
}
void __init early_fixmap_init(void)

4
arch/hexagon/include/asm/fixmap.h
View File

@ -15,8 +15,4 @@
#include <asm-generic/fixmap.h>
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel(pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), \
(vaddr)), (vaddr)), (vaddr)), (vaddr))
#endif

22
arch/m68k/mm/motorola.c
View File

@ -54,17 +54,8 @@ static inline void nocache_page(void *vaddr)
unsigned long addr = (unsigned long)vaddr;
if (CPU_IS_040_OR_060) {
pgd_t *dir;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
pte_t *ptep = virt_to_kpte(addr);
dir = pgd_offset_k(addr);
p4dp = p4d_offset(dir, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset_kernel(pmdp, addr);
*ptep = pte_mknocache(*ptep);
}
}
@ -74,17 +65,8 @@ static inline void cache_page(void *vaddr)
unsigned long addr = (unsigned long)vaddr;
if (CPU_IS_040_OR_060) {
pgd_t *dir;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
pte_t *ptep = virt_to_kpte(addr);
dir = pgd_offset_k(addr);
p4dp = p4d_offset(dir, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset_kernel(pmdp, addr);
*ptep = pte_mkcache(*ptep);
}
}

8
arch/microblaze/kernel/signal.c
View File

@ -159,9 +159,6 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
int err = 0, sig = ksig->sig;
unsigned long address = 0;
#ifdef CONFIG_MMU
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
#endif
@ -197,10 +194,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
address = ((unsigned long)frame->tramp);
#ifdef CONFIG_MMU
pgdp = pgd_offset(current->mm, address);
p4dp = p4d_offset(pgdp, address);
pudp = pud_offset(p4dp, address);
pmdp = pmd_offset(pudp, address);
pmdp = pmd_off(current->mm, address);
preempt_disable();
ptep = pte_offset_map(pmdp, address);

9
arch/microblaze/mm/init.c
View File

@ -50,15 +50,6 @@ unsigned long lowmem_size;
pte_t *kmap_pte;
EXPORT_SYMBOL(kmap_pte);
static inline pte_t *virt_to_kpte(unsigned long vaddr)
{
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d = p4d_offset(pgd, vaddr);
pud_t *pud = pud_offset(p4d, vaddr);
return pte_offset_kernel(pmd_offset(pud, vaddr), vaddr);
}
static void __init highmem_init(void)
{
pr_debug("%x\n", (u32)PKMAP_BASE);

3
arch/mips/include/asm/fixmap.h
View File

@ -69,9 +69,6 @@ enum fixed_addresses {
#include <asm-generic/fixmap.h>
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel(pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)), (vaddr))
/*
* Called from pgtable_init()
*/

10
arch/mips/mm/c-r3k.c
View File

@ -239,9 +239,6 @@ static void r3k_flush_cache_page(struct vm_area_struct *vma,
unsigned long kaddr = KSEG0ADDR(pfn << PAGE_SHIFT);
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@ -252,11 +249,8 @@ static void r3k_flush_cache_page(struct vm_area_struct *vma,
if (cpu_context(smp_processor_id(), mm) == 0)
return;
pgdp = pgd_offset(mm, addr);
p4dp = p4d_offset(pgdp, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset(pmdp, addr);
pmdp = pmd_off(mm, addr);
ptep = pte_offset_kernel(pmdp, addr);
/* Invalid => no such page in the cache. */
if (!(pte_val(*ptep) & _PAGE_PRESENT))

10
arch/mips/mm/c-r4k.c
View File

@ -652,9 +652,6 @@ static inline void local_r4k_flush_cache_page(void *args)
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
int map_coherent = 0;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
void *vaddr;
@ -667,11 +664,8 @@ static inline void local_r4k_flush_cache_page(void *args)
return;
addr &= PAGE_MASK;
pgdp = pgd_offset(mm, addr);
p4dp = p4d_offset(pgdp, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset(pmdp, addr);
pmdp = pmd_off(mm, addr);
ptep = pte_offset_kernel(pmdp, addr);
/*
* If the page isn't marked valid, the page cannot possibly be

10
arch/mips/mm/c-tx39.c
View File

@ -168,9 +168,6 @@ static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page
{
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@ -182,11 +179,8 @@ static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page
return;
page &= PAGE_MASK;
pgdp = pgd_offset(mm, page);
p4dp = p4d_offset(pgdp, page);
pudp = pud_offset(p4dp, page);
pmdp = pmd_offset(pudp, page);
ptep = pte_offset(pmdp, page);
pmdp = pmd_off(mm, page);
ptep = pte_offset_kernel(pmdp, page);
/*
* If the page isn't marked valid, the page cannot possibly be

2
arch/mips/mm/highmem.c
View File

@ -90,5 +90,5 @@ void __init kmap_init(void)
/* cache the first kmap pte */
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
kmap_pte = virt_to_kpte(kmap_vstart);
}

2
arch/nds32/include/asm/pgtable.h
View File

@ -195,8 +195,6 @@ extern void paging_init(void);
#define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(pte) do { } while (0)
#define pmd_off_k(address) pmd_offset(pud_offset(p4d_offset(pgd_offset_k(address), (address)), (address)), (address))
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
/*
* Set a level 1 translation table entry, and clean it out of

13
arch/nds32/mm/init.c
View File

@ -98,9 +98,6 @@ static pmd_t *fixmap_pmd_p;
static void __init fixedrange_init(void)
{
unsigned long vaddr;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
#ifdef CONFIG_HIGHMEM
pte_t *pte;
@ -110,10 +107,7 @@ static void __init fixedrange_init(void)
* Fixed mappings:
*/
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
pgd = swapper_pg_dir + pgd_index(vaddr);
p4d = p4d_offset(pgd, vaddr);
pud = pud_offset(p4d, vaddr);
pmd = pmd_offset(pud, vaddr);
pmd = pmd_off_k(vaddr);
fixmap_pmd_p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!fixmap_pmd_p)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
@ -126,10 +120,7 @@ static void __init fixedrange_init(void)
*/
vaddr = PKMAP_BASE;
pgd = swapper_pg_dir + pgd_index(vaddr);
p4d = p4d_offset(pgd, vaddr);
pud = pud_offset(p4d, vaddr);
pmd = pmd_offset(pud, vaddr);
pmd = pmd_off_k(vaddr);
pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pte)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",

6
arch/nds32/mm/proc.c
View File

@ -15,14 +15,10 @@ extern struct cache_info L1_cache_info[2];
int va_kernel_present(unsigned long addr)
{
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *ptep, pte;
p4d = p4d_offset(pgd_offset_k(addr), addr);
pud = pud_offset(p4d, addr);
pmd = pmd_offset(pud, addr);
pmd = pmd_off_k(addr);
if (!pmd_none(*pmd)) {
ptep = pte_offset_map(pmd, addr);
pte = *ptep;

6
arch/parisc/mm/fixmap.c
View File

@ -33,11 +33,7 @@ void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
void notrace clear_fixmap(enum fixed_addresses idx)
{
unsigned long vaddr = __fix_to_virt(idx);
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d = p4d_offset(pgd, vaddr);
pud_t *pud = pud_offset(p4d, vaddr);
pmd_t *pmd = pmd_offset(pud, vaddr);
pte_t *pte = pte_offset_kernel(pmd, vaddr);
pte_t *pte = virt_to_kpte(vaddr);
if (WARN_ON(pte_none(*pte)))
return;

19
arch/powerpc/include/asm/pgtable.h
View File

@ -41,25 +41,6 @@ struct mm_struct;
#ifndef __ASSEMBLY__
#ifdef CONFIG_PPC32
static inline pmd_t *pmd_ptr(struct mm_struct *mm, unsigned long va)
{
return pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, va), va), va), va);
}
static inline pmd_t *pmd_ptr_k(unsigned long va)
{
return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va);
}
static inline pte_t *virt_to_kpte(unsigned long vaddr)
{
pmd_t *pmd = pmd_ptr_k(vaddr);
return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr);
}
#endif
#include <asm/tlbflush.h>
/* Keep these as a macros to avoid include dependency mess */

2
arch/powerpc/mm/book3s32/mmu.c
View File

@ -320,7 +320,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea)
if (!Hash)
return;
pmd = pmd_ptr(mm, ea);
pmd = pmd_off(mm, ea);
if (!pmd_none(*pmd))
add_hash_page(mm->context.id, ea, pmd_val(*pmd));
}

4
arch/powerpc/mm/book3s32/tlb.c
View File

@ -90,7 +90,7 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
if (start >= end)
return;
end = (end - 1) | ~PAGE_MASK;
pmd = pmd_ptr(mm, start);
pmd = pmd_off(mm, start);
for (;;) {
pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
if (pmd_end > end)
@ -148,7 +148,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
return;
}
mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
pmd = pmd_ptr(mm, vmaddr);
pmd = pmd_off(mm, vmaddr);
if (!pmd_none(*pmd))
flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
}

4
arch/powerpc/mm/kasan/8xx.c
View File

@ -10,7 +10,7 @@
static int __init
kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block)
{
pmd_t *pmd = pmd_ptr_k(k_start);
pmd_t *pmd = pmd_off_k(k_start);
unsigned long k_cur, k_next;
for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) {
@ -59,7 +59,7 @@ int __init kasan_init_region(void *start, size_t size)
return ret;
for (; k_cur < k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_ptr_k(k_cur);
pmd_t *pmd = pmd_off_k(k_cur);
void *va = block + k_cur - k_start;
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);

2
arch/powerpc/mm/kasan/book3s_32.c
View File

@ -46,7 +46,7 @@ int __init kasan_init_region(void *start, size_t size)
kasan_update_early_region(k_start, k_cur, __pte(0));
for (; k_cur < k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_ptr_k(k_cur);
pmd_t *pmd = pmd_off_k(k_cur);
void *va = block + k_cur - k_start;
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);

8
arch/powerpc/mm/kasan/kasan_init_32.c
View File

@ -33,7 +33,7 @@ int __init kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_
pmd_t *pmd;
unsigned long k_cur, k_next;
pmd = pmd_ptr_k(k_start);
pmd = pmd_off_k(k_start);
for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++) {
pte_t *new;
@ -69,7 +69,7 @@ int __init __weak kasan_init_region(void *start, size_t size)
return -ENOMEM;
for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_ptr_k(k_cur);
pmd_t *pmd = pmd_off_k(k_cur);
void *va = block + k_cur - k_start;
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
@ -86,7 +86,7 @@ kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte)
phys_addr_t pa = __pa(kasan_early_shadow_page);
for (k_cur = k_start; k_cur != k_end; k_cur += PAGE_SIZE) {
pmd_t *pmd = pmd_ptr_k(k_cur);
pmd_t *pmd = pmd_off_k(k_cur);
pte_t *ptep = pte_offset_kernel(pmd, k_cur);
if ((pte_val(*ptep) & PTE_RPN_MASK) != pa)
@ -184,7 +184,7 @@ void __init kasan_early_init(void)
unsigned long addr = KASAN_SHADOW_START;
unsigned long end = KASAN_SHADOW_END;
unsigned long next;
pmd_t *pmd = pmd_ptr_k(addr);
pmd_t *pmd = pmd_off_k(addr);
BUILD_BUG_ON(KASAN_SHADOW_START & ~PGDIR_MASK);

4
arch/powerpc/mm/nohash/40x.c
View File

@ -103,7 +103,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
pmd_t *pmdp;
unsigned long val = p | _PMD_SIZE_16M | _PAGE_EXEC | _PAGE_RW;
pmdp = pmd_ptr_k(v);
pmdp = pmd_off_k(v);
*pmdp++ = __pmd(val);
*pmdp++ = __pmd(val);
*pmdp++ = __pmd(val);
@ -118,7 +118,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
pmd_t *pmdp;
unsigned long val = p | _PMD_SIZE_4M | _PAGE_EXEC | _PAGE_RW;
pmdp = pmd_ptr_k(v);
pmdp = pmd_off_k(v);
*pmdp = __pmd(val);
v += LARGE_PAGE_SIZE_4M;

2
arch/powerpc/mm/nohash/8xx.c
View File

@ -74,7 +74,7 @@ static pte_t __init *early_hugepd_alloc_kernel(hugepd_t *pmdp, unsigned long va)
static int __ref __early_map_kernel_hugepage(unsigned long va, phys_addr_t pa,
pgprot_t prot, int psize, bool new)
{
pmd_t *pmdp = pmd_ptr_k(va);
pmd_t *pmdp = pmd_off_k(va);
pte_t *ptep;
if (WARN_ON(psize != MMU_PAGE_512K && psize != MMU_PAGE_8M))

4
arch/powerpc/mm/pgtable_32.c
View File

@ -40,7 +40,7 @@ notrace void __init early_ioremap_init(void)
{
unsigned long addr = ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE);
pte_t *ptep = (pte_t *)early_fixmap_pagetable;
pmd_t *pmdp = pmd_ptr_k(addr);
pmd_t *pmdp = pmd_off_k(addr);
for (; (s32)(FIXADDR_TOP - addr) > 0;
addr += PGDIR_SIZE, ptep += PTRS_PER_PTE, pmdp++)
@ -78,7 +78,7 @@ int __ref map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)
int err = -ENOMEM;
/* Use upper 10 bits of VA to index the first level map */
pd = pmd_ptr_k(va);
pd = pmd_off_k(va);
/* Use middle 10 bits of VA to index the second-level map */
if (likely(slab_is_available()))
pg = pte_alloc_kernel(pd, va);

10
arch/s390/mm/pageattr.c
View File

@ -337,19 +337,11 @@ void __kernel_map_pages(struct page *page, int numpages, int enable)
{
unsigned long address;
int nr, i, j;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
for (i = 0; i < numpages;) {
address = page_to_phys(page + i);
pgd = pgd_offset_k(address);
p4d = p4d_offset(pgd, address);
pud = pud_offset(p4d, address);
pmd = pmd_offset(pud, address);
pte = pte_offset_kernel(pmd, address);
pte = virt_to_kpte(address);
nr = (unsigned long)pte >> ilog2(sizeof(long));
nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
nr = min(numpages - i, nr);

8
arch/sh/mm/cache-sh4.c
View File

@ -207,9 +207,6 @@ static void sh4_flush_cache_page(void *args)
struct page *page;
unsigned long address, pfn, phys;
int map_coherent = 0;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
void *vaddr;
@ -223,10 +220,7 @@ static void sh4_flush_cache_page(void *args)
if (cpu_context(smp_processor_id(), vma->vm_mm) == NO_CONTEXT)
return;
pgd = pgd_offset(vma->vm_mm, address);
p4d = p4d_offset(pgd, address);
pud = pud_offset(p4d, address);
pmd = pmd_offset(pud, address);
pmd = pmd_off(vma->vm_mm, address);
pte = pte_offset_kernel(pmd, address);
/* If the page isn't present, there is nothing to do here. */

5
arch/sh/mm/kmap.c
View File

@ -14,9 +14,6 @@
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel(pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)), vaddr)
static pte_t *kmap_coherent_pte;
void __init kmap_coherent_init(void)
@ -25,7 +22,7 @@ void __init kmap_coherent_init(void)
/* cache the first coherent kmap pte */
vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
kmap_coherent_pte = virt_to_kpte(vaddr);
}
void *kmap_coherent(struct page *page, unsigned long addr)

12
arch/sparc/mm/highmem.c
View File

@ -36,18 +36,10 @@ static pte_t *kmap_pte;
void __init kmap_init(void)
{
unsigned long address;
p4d_t *p4d;
pud_t *pud;
pmd_t *dir;
address = __fix_to_virt(FIX_KMAP_BEGIN);
p4d = p4d_offset(pgd_offset_k(address), address);
pud = pud_offset(p4d, address);
dir = pmd_offset(pud, address);
unsigned long address = __fix_to_virt(FIX_KMAP_BEGIN);
/* cache the first kmap pte */
kmap_pte = pte_offset_kernel(dir, address);
kmap_pte = virt_to_kpte(address);
}
void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)

6
arch/sparc/mm/init_64.c
View File

@ -503,11 +503,7 @@ void __kprobes flush_icache_range(unsigned long start, unsigned long end)
if (kaddr >= PAGE_OFFSET)
paddr = kaddr & mask;
else {
pgd_t *pgdp = pgd_offset_k(kaddr);
p4d_t *p4dp = p4d_offset(pgdp, kaddr);
pud_t *pudp = pud_offset(p4dp, kaddr);
pmd_t *pmdp = pmd_offset(pudp, kaddr);
pte_t *ptep = pte_offset_kernel(pmdp, kaddr);
pte_t *ptep = virt_to_kpte(kaddr);
paddr = pte_val(*ptep) & mask;
}

10
arch/sparc/mm/io-unit.c
View File

@ -240,21 +240,15 @@ static void *iounit_alloc(struct device *dev, size_t len,
while(addr < end) {
page = va;
{
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
long i;
pgdp = pgd_offset(&init_mm, addr);
p4dp = p4d_offset(pgdp, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
pmdp = pmd_off_k(addr);
ptep = pte_offset_map(pmdp, addr);
set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
iopte = iounit->page_table + i;

8
arch/sparc/mm/iommu.c
View File

@ -348,9 +348,6 @@ static void *sbus_iommu_alloc(struct device *dev, size_t len,
while(addr < end) {
page = va;
{
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@ -361,10 +358,7 @@ static void *sbus_iommu_alloc(struct device *dev, size_t len,
else
__flush_page_to_ram(page);
pgdp = pgd_offset(&init_mm, addr);
p4dp = p4d_offset(pgdp, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
pmdp = pmd_off_k(addr);
ptep = pte_offset_map(pmdp, addr);
set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));

10
arch/um/kernel/mem.c
View File

@ -125,10 +125,6 @@ static void __init fixaddr_user_init( void)
{
#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
long size = FIXADDR_USER_END - FIXADDR_USER_START;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
phys_t p;
unsigned long v, vaddr = FIXADDR_USER_START;
@ -146,11 +142,7 @@ static void __init fixaddr_user_init( void)
p = __pa(v);
for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE,
p += PAGE_SIZE) {
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);
pte = virt_to_kpte(vaddr);
pte_set_val(*pte, p, PAGE_READONLY);
}
#endif

8
arch/um/kernel/trap.c
View File

@ -26,9 +26,6 @@ int handle_page_fault(unsigned long address, unsigned long ip,
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
int err = -EFAULT;
@ -102,10 +99,7 @@ int handle_page_fault(unsigned long address, unsigned long ip,
}
}
pgd = pgd_offset(mm, address);
p4d = p4d_offset(pgd, address);
pud = pud_offset(p4d, address);
pmd = pmd_offset(pud, address);
pmd = pmd_off(mm, address);
pte = pte_offset_kernel(pmd, address);
} while (!pte_present(*pte));
err = 0;

10
arch/unicore32/mm/mm.h
View File

@ -14,16 +14,6 @@ extern int sysctl_overcommit_memory;
#define TOP_PTE(x) pte_offset_kernel(top_pmd, x)
static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt)
{
return pmd_offset((pud_t *)pgd, virt);
}
static inline pmd_t *pmd_off_k(unsigned long virt)
{
return pmd_off(pgd_offset_k(virt), virt);
}
struct mem_type {
unsigned int prot_pte;
unsigned int prot_l1;

26
arch/x86/mm/init_32.c
View File

@ -395,15 +395,6 @@ kernel_physical_mapping_init(unsigned long start,
pte_t *kmap_pte;
static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
{
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d = p4d_offset(pgd, vaddr);
pud_t *pud = pud_offset(p4d, vaddr);
pmd_t *pmd = pmd_offset(pud, vaddr);
return pte_offset_kernel(pmd, vaddr);
}
static void __init kmap_init(void)
{
unsigned long kmap_vstart;
@ -412,28 +403,17 @@ static void __init kmap_init(void)
* Cache the first kmap pte:
*/
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
kmap_pte = virt_to_kpte(kmap_vstart);
}
#ifdef CONFIG_HIGHMEM
static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
unsigned long vaddr;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long vaddr = PKMAP_BASE;
vaddr = PKMAP_BASE;
page_table_range_init(vaddr, 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;
pkmap_page_table = virt_to_kpte(vaddr);
}
void __init add_highpages_with_active_regions(int nid,

8
arch/xtensa/include/asm/fixmap.h
View File

@ -76,12 +76,4 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr)
#endif
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel( \
pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), \
(vaddr)), \
(vaddr)), \
(vaddr)), \
(vaddr))
#endif

2
arch/xtensa/mm/highmem.c
View File

@ -86,6 +86,6 @@ void __init kmap_init(void)
BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE);
/* cache the first kmap pte */
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
kmap_pte = virt_to_kpte(kmap_vstart);
kmap_waitqueues_init();
}

10
arch/xtensa/mm/kasan_init.c
View File

@ -19,10 +19,7 @@
void __init kasan_early_init(void)
{
unsigned long vaddr = KASAN_SHADOW_START;
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d = p4d_offset(pgd, vaddr);
pud_t *pud = pud_offset(p4d, vaddr);
pmd_t *pmd = pmd_offset(pud, vaddr);
pmd_t *pmd = pmd_off_k(vaddr);
int i;
for (i = 0; i < PTRS_PER_PTE; ++i)
@ -43,10 +40,7 @@ static void __init populate(void *start, void *end)
unsigned long n_pmds = n_pages / PTRS_PER_PTE;
unsigned long i, j;
unsigned long vaddr = (unsigned long)start;
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d = p4d_offset(pgd, vaddr);
pud_t *pud = pud_offset(p4d, vaddr);
pmd_t *pmd = pmd_offset(pud, vaddr);
pmd_t *pmd = pmd_off_k(vaddr);
pte_t *pte = memblock_alloc(n_pages * sizeof(pte_t), PAGE_SIZE);
if (!pte)

5
arch/xtensa/mm/mmu.c
View File

@ -21,10 +21,7 @@
#if defined(CONFIG_HIGHMEM)
static void * __init init_pmd(unsigned long vaddr, unsigned long n_pages)
{
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d = p4d_offset(pgd, vaddr);
pud_t *pud = pud_offset(p4d, vaddr);
pmd_t *pmd = pmd_offset(pud, vaddr);
pmd_t *pmd = pmd_off_k(vaddr);
pte_t *pte;
unsigned long i;

24
include/linux/pgtable.h
View File

@ -28,6 +28,30 @@
#define USER_PGTABLES_CEILING 0UL
#endif
/*
* In many cases it is known that a virtual address is mapped at PMD or PTE
* level, so instead of traversing all the page table levels, we can get a
* pointer to the PMD entry in user or kernel page table or translate a virtual
* address to the pointer in the PTE in the kernel page tables with simple
* helpers.
*/
static inline pmd_t *pmd_off(struct mm_struct *mm, unsigned long va)
{
return pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, va), va), va), va);
}
static inline pmd_t *pmd_off_k(unsigned long va)
{
return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va);
}
static inline pte_t *virt_to_kpte(unsigned long vaddr)
{
pmd_t *pmd = pmd_off_k(vaddr);
return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr);
}
#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
extern int ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep,