linux-kernel - [PATCH v3 3/5] x86: Kconfig: Remove CONFIG_NODES_SPAN_OTHER

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Date:   Sat, 28 Mar 2020 11:31:20 -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 3/5] x86: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES

Remove CONFIG_NODES_SPAN_OTHER_NODES as it's enabled
by default. It is now enabled for x86(32 bit) configurations
and do not depend on X64_64_ACPI_NUMA config.
Because of that, on NUMA enabled system, early_pfn_in_nid() 
function is called by memmap_init_zone() during boot-time.
It doesn't affect the performance at run-time.

Signed-off-by: Hoan Tran <Hoan@...amperecomputing.com>
---
 arch/x86/Kconfig | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5e89499..a938738 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1581,15 +1581,6 @@ config X86_64_ACPI_NUMA
 	---help---
 	  Enable ACPI SRAT based node topology detection.
 
-# Some NUMA nodes have memory ranges that span
-# other nodes.  Even though a pfn is valid and
-# between a node's start and end pfns, it may not
-# reside on that node.  See memmap_init_zone()
-# for details.
-config NODES_SPAN_OTHER_NODES
-	def_bool y
-	depends on X86_64_ACPI_NUMA
-
 config NUMA_EMU
 	bool "NUMA emulation"
 	depends on NUMA
-- 
1.8.3.1