linux-kernel - [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER

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Message-Id: <1585420282-25630-1-git-send-email-Hoan@os.amperecomputing.com>
Date:   Sat, 28 Mar 2020 11:31:17 -0700
From:   Hoan Tran <Hoan@...amperecomputing.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Cc:     linux-mm@...ck.org (open list:MEMORY MANAGEMENT),
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        lho@...erecomputing.com, mmorana@...erecomputing.com,
        Hoan Tran <Hoan@...amperecomputing.com>
Subject: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA

In NUMA layout which nodes have memory ranges that span across other nodes,
the mm driver can detect the memory node id incorrectly.

For example, with layout below
Node 0 address: 0000 xxxx 0000 xxxx
Node 1 address: xxxx 1111 xxxx 1111

Note:
 - Memory from low to high
 - 0/1: Node id
 - x: Invalid memory of a node

When mm probes the memory map, without CONFIG_NODES_SPAN_OTHER_NODES
config, mm only checks the memory validity but not the node id.
Because of that, Node 1 also detects the memory from node 0 as below
when it scans from the start address to the end address of node 1.

Node 0 address: 0000 xxxx xxxx xxxx
Node 1 address: xxxx 1111 1111 1111

This layout could occur on any architecture. Most of them enables
this config by default with CONFIG_NUMA. This patch, by default, enables
CONFIG_NODES_SPAN_OTHER_NODES or uses early_pfn_in_nid() for NUMA.

v3:
 * Revise the patch description

V2:
 * Revise the patch description

Hoan Tran (5):
  mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA
  powerpc: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES
  x86: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES
  sparc: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES
  s390: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES

 arch/powerpc/Kconfig | 9 ---------
 arch/s390/Kconfig    | 8 --------
 arch/sparc/Kconfig   | 9 ---------
 arch/x86/Kconfig     | 9 ---------
 mm/page_alloc.c      | 2 +-
 5 files changed, 1 insertion(+), 36 deletions(-)

-- 
1.8.3.1