mm: consolidate pte_index() and pte_offset_*() definitions

All architectures define pte_index() as

	(address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)

and all architectures define pte_offset_kernel() as an entry in the array
of PTEs indexed by the pte_index().

For the most architectures the pte_offset_kernel() implementation relies
on the availability of pmd_page_vaddr() that converts a PMD entry value to
the virtual address of the page containing PTEs array.

Let's move x86 definitions of the PTE accessors to the generic place in
<linux/pgtable.h> and then simply drop the respective definitions from the
other architectures.

The architectures that didn't provide pmd_page_vaddr() are updated to have
that defined.

The generic implementation of pte_offset_kernel() can be overridden by an
architecture and alpha makes use of this because it has special ordering
requirements for its version of pte_offset_kernel().

[rppt@linux.ibm.com: v2]
  Link: http://lkml.kernel.org/r/20200514170327.31389-11-rppt@kernel.org
[rppt@linux.ibm.com: update]
  Link: http://lkml.kernel.org/r/20200514170327.31389-12-rppt@kernel.org
[rppt@linux.ibm.com: update]
  Link: http://lkml.kernel.org/r/20200514170327.31389-13-rppt@kernel.org
[akpm@linux-foundation.org: fix x86 warning]
[sfr@canb.auug.org.au: fix powerpc build]
  Link: http://lkml.kernel.org/r/20200607153443.GB738695@linux.ibm.com

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
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/20200514170327.31389-10-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 0 insertions, 54 deletions

diff --git a/arch/mips/include/asm/pgtable-32.h b/arch/mips/include/asm/pgtable-32.h
index 1945c8970141..a950fc1ddb4d 100644
--- a/arch/mips/include/asm/pgtable-32.h
+++ b/arch/mips/include/asm/pgtable-32.h
@@ -195,28 +195,6 @@ static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot)
 
 #define pte_page(x)		pfn_to_page(pte_pfn(x))
 
-/* to find an entry in a kernel page-table-directory */
-#define pgd_offset_k(address) pgd_offset(&init_mm, address)
-
-#define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
-#define pud_index(address)	(((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
-#define pmd_index(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
-
-/* to find an entry in a page-table-directory */
-#define pgd_offset(mm, addr)	((mm)->pgd + pgd_index(addr))
-
-/* Find an entry in the third-level page table.. */
-#define __pte_offset(address)						\
-	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
-#define pte_offset(dir, address)					\
-	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
-#define pte_offset_kernel(dir, address)					\
-	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
-
-#define pte_offset_map(dir, address)					\
-	((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
-#define pte_unmap(pte) ((void)(pte))
-
 #if defined(CONFIG_CPU_R3K_TLB)
 
 /* Swap entries must have VALID bit cleared. */
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index ee5dc0c145b9..1e7d6ce9d8d6 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -172,8 +172,6 @@
 
 extern pte_t invalid_pte_table[PTRS_PER_PTE];
 
-#define pud_index(address)	(((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
-
 #ifndef __PAGETABLE_PUD_FOLDED
 /*
  * For 4-level pagetables we defines these ourselves, for 3-level the
@@ -222,11 +220,6 @@ static inline unsigned long p4d_page_vaddr(p4d_t p4d)
 
 #define p4d_index(address)	(((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
 
-static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
-{
-	return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
-}
-
 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
 {
 	*p4d = p4dval;
@@ -320,15 +313,6 @@ static inline void pud_clear(pud_t *pudp)
 #define pfn_pmd(pfn, prot)	__pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
 #endif
 
-/* to find an entry in a kernel page-table-directory */
-#define pgd_offset_k(address) pgd_offset(&init_mm, address)
-
-#define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
-#define pmd_index(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
-
-/* to find an entry in a page-table-directory */
-#define pgd_offset(mm, addr)	((mm)->pgd + pgd_index(addr))
-
 #ifndef __PAGETABLE_PMD_FOLDED
 static inline unsigned long pud_page_vaddr(pud_t pud)
 {
@@ -337,24 +321,8 @@ static inline unsigned long pud_page_vaddr(pud_t pud)
 #define pud_phys(pud)		virt_to_phys((void *)pud_val(pud))
 #define pud_page(pud)		(pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
 
-/* Find an entry in the second-level page table.. */
-static inline pmd_t *pmd_offset(pud_t * pud, unsigned long address)
-{
-	return (pmd_t *) pud_page_vaddr(*pud) + pmd_index(address);
-}
 #endif
 
-/* Find an entry in the third-level page table.. */
-#define __pte_offset(address)						\
-	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
-#define pte_offset(dir, address)					\
-	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
-#define pte_offset_kernel(dir, address)					\
-	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
-#define pte_offset_map(dir, address)					\
-	((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
-#define pte_unmap(pte) ((void)(pte))
-
 /*
  * Initialize a new pgd / pmd table with invalid pointers.
  */