• Mike Rapoport's avatar
    mm: remove CONFIG_HAVE_MEMBLOCK_NODE_MAP option · 3f08a302
    Mike Rapoport authored
    CONFIG_HAVE_MEMBLOCK_NODE_MAP is used to differentiate initialization of
    nodes and zones structures between the systems that have region to node
    mapping in memblock and those that don't.
    
    Currently all the NUMA architectures enable this option and for the
    non-NUMA systems we can presume that all the memory belongs to node 0 and
    therefore the compile time configuration option is not required.
    
    The remaining few architectures that use DISCONTIGMEM without NUMA are
    easily updated to use memblock_add_node() instead of memblock_add() and
    thus have proper correspondence of memblock regions to NUMA nodes.
    
    Still, free_area_init_node() must have a backward compatible version
    because its semantics with and without CONFIG_HAVE_MEMBLOCK_NODE_MAP is
    different.  Once all the architectures will use the new semantics, the
    entire compatibility layer can be dropped.
    
    To avoid addition of extra run time memory to store node id for
    architectures that keep memblock but have only a single node, the node id
    field of the memblock_region is guarded by CONFIG_NEED_MULTIPLE_NODES and
    the corresponding accessors presume that in those cases it is always 0.
    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]
    Acked-by: Catalin Marinas <catalin.marinas@arm.com>	[arm64]
    Cc: Baoquan He <bhe@redhat.com>
    Cc: Brian Cain <bcain@codeaurora.org>
    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>
    Link: http://lkml.kernel.org/r/20200412194859.12663-4-rppt@kernel.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    3f08a302
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