• Mike Rapoport's avatar
    mm: free_area_init: allow defining max_zone_pfn in descending order · 51930df5
    Mike Rapoport authored
    Some architectures (e.g.  ARC) have the ZONE_HIGHMEM zone below the
    ZONE_NORMAL.  Allowing free_area_init() parse max_zone_pfn array even it
    is sorted in descending order allows using free_area_init() on such
    architectures.
    
    Add top -> down traversal of max_zone_pfn array in free_area_init() and
    use the latter in ARC node/zone initialization.
    
    [rppt@kernel.org: ARC fix]
      Link: http://lkml.kernel.org/r/20200504153901.GM14260@kernel.org
    [rppt@linux.ibm.com: arc: free_area_init(): take into account PAE40 mode]
      Link: http://lkml.kernel.org/r/20200507205900.GH683243@linux.ibm.com
    [akpm@linux-foundation.org: declare arch_has_descending_max_zone_pfns()]
    Signed-off-by: default avatarMike Rapoport <rppt@linux.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Tested-by: Hoan Tran <hoan@os.amperecomputing.com>	[arm64]
    Reviewed-by: default avatarBaoquan He <bhe@redhat.com>
    Cc: Brian Cain <bcain@codeaurora.org>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    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: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Ley Foon Tan <ley.foon.tan@intel.com>
    Cc: Mark Salter <msalter@redhat.com>
    Cc: Matt Turner <mattst88@gmail.com>
    Cc: Max Filippov <jcmvbkbc@gmail.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Michal Hocko <mhocko@kernel.org>
    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: Tony Luck <tony.luck@intel.com>
    Cc: Vineet Gupta <vgupta@synopsys.com>
    Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
    Cc: Guenter Roeck <linux@roeck-us.net>
    Link: http://lkml.kernel.org/r/20200412194859.12663-18-rppt@kernel.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    51930df5
page_alloc.c 244 KB