• Mike Rapoport's avatar
    mm: consolidate pte_index() and pte_offset_*() definitions · 974b9b2c
    Mike Rapoport authored
    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.comSigned-off-by: default avatarMike Rapoport <rppt@linux.ibm.com>
    Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
    Signed-off-by: default avatarAndrew 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.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    974b9b2c
pgtable.h 13.1 KB