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Message-ID: <20240723064156.4009477-9-rppt@kernel.org>
Date: Tue, 23 Jul 2024 09:41:39 +0300
From: Mike Rapoport <rppt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>,
Andreas Larsson <andreas@...sler.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>,
Borislav Petkov <bp@...en8.de>,
Catalin Marinas <catalin.marinas@....com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Dan Williams <dan.j.williams@...el.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
David Hildenbrand <david@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Davidlohr Bueso <dave@...olabs.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Heiko Carstens <hca@...ux.ibm.com>,
Huacai Chen <chenhuacai@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
Jonathan Cameron <jonathan.cameron@...wei.com>,
Jonathan Corbet <corbet@....net>,
Michael Ellerman <mpe@...erman.id.au>,
Mike Rapoport <rppt@...nel.org>,
Palmer Dabbelt <palmer@...belt.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Rob Herring <robh@...nel.org>,
Samuel Holland <samuel.holland@...ive.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Thomas Gleixner <tglx@...utronix.de>,
Vasily Gorbik <gor@...ux.ibm.com>,
Will Deacon <will@...nel.org>,
Zi Yan <ziy@...dia.com>,
devicetree@...r.kernel.org,
linux-acpi@...r.kernel.org,
linux-arch@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-cxl@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-mips@...r.kernel.org,
linux-mm@...ck.org,
linux-riscv@...ts.infradead.org,
linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
loongarch@...ts.linux.dev,
nvdimm@...ts.linux.dev,
sparclinux@...r.kernel.org,
x86@...nel.org,
Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v2 08/25] arch, mm: move definition of node_data to generic code
From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
Every architecture that supports NUMA defines node_data in the same way:
struct pglist_data *node_data[MAX_NUMNODES];
No reason to keep multiple copies of this definition and its forward
declarations, especially when such forward declaration is the only thing
in include/asm/mmzone.h for many architectures.
Add definition and declaration of node_data to generic code and drop
architecture-specific versions.
Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
Acked-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Davidlohr Bueso <dave@...olabs.net>
---
arch/arm64/include/asm/Kbuild | 1 +
arch/arm64/include/asm/mmzone.h | 13 -------------
arch/arm64/include/asm/topology.h | 1 +
arch/loongarch/include/asm/Kbuild | 1 +
arch/loongarch/include/asm/mmzone.h | 16 ----------------
arch/loongarch/include/asm/topology.h | 1 +
arch/loongarch/kernel/numa.c | 3 ---
arch/mips/include/asm/mach-ip27/mmzone.h | 4 ----
arch/mips/include/asm/mach-loongson64/mmzone.h | 4 ----
arch/mips/loongson64/numa.c | 2 --
arch/mips/sgi-ip27/ip27-memory.c | 3 ---
arch/powerpc/include/asm/mmzone.h | 6 ------
arch/powerpc/mm/numa.c | 2 --
arch/riscv/include/asm/Kbuild | 1 +
arch/riscv/include/asm/mmzone.h | 13 -------------
arch/riscv/include/asm/topology.h | 4 ++++
arch/s390/include/asm/Kbuild | 1 +
arch/s390/include/asm/mmzone.h | 17 -----------------
arch/s390/kernel/numa.c | 3 ---
arch/sh/include/asm/mmzone.h | 3 ---
arch/sh/mm/numa.c | 3 ---
arch/sparc/include/asm/mmzone.h | 4 ----
arch/sparc/mm/init_64.c | 2 --
arch/x86/include/asm/Kbuild | 1 +
arch/x86/include/asm/mmzone.h | 6 ------
arch/x86/include/asm/mmzone_32.h | 17 -----------------
arch/x86/include/asm/mmzone_64.h | 18 ------------------
arch/x86/mm/numa.c | 3 ---
drivers/base/arch_numa.c | 2 --
include/asm-generic/mmzone.h | 5 +++++
include/linux/numa.h | 3 +++
mm/numa.c | 3 +++
32 files changed, 22 insertions(+), 144 deletions(-)
delete mode 100644 arch/arm64/include/asm/mmzone.h
delete mode 100644 arch/loongarch/include/asm/mmzone.h
delete mode 100644 arch/riscv/include/asm/mmzone.h
delete mode 100644 arch/s390/include/asm/mmzone.h
delete mode 100644 arch/x86/include/asm/mmzone.h
delete mode 100644 arch/x86/include/asm/mmzone_32.h
delete mode 100644 arch/x86/include/asm/mmzone_64.h
create mode 100644 include/asm-generic/mmzone.h
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 4b6d2d52053e..4aaaa821ab6b 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
generic-y += early_ioremap.h
generic-y += mcs_spinlock.h
+generic-y += mmzone.h
generic-y += qrwlock.h
generic-y += qspinlock.h
generic-y += parport.h
diff --git a/arch/arm64/include/asm/mmzone.h b/arch/arm64/include/asm/mmzone.h
deleted file mode 100644
index fa17e01d9ab2..000000000000
--- a/arch/arm64/include/asm/mmzone.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ASM_MMZONE_H
-#define __ASM_MMZONE_H
-
-#ifdef CONFIG_NUMA
-
-#include <asm/numa.h>
-
-extern struct pglist_data *node_data[];
-#define NODE_DATA(nid) (node_data[(nid)])
-
-#endif /* CONFIG_NUMA */
-#endif /* __ASM_MMZONE_H */
diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h
index 0f6ef432fb84..5fc3af9f8f29 100644
--- a/arch/arm64/include/asm/topology.h
+++ b/arch/arm64/include/asm/topology.h
@@ -5,6 +5,7 @@
#include <linux/cpumask.h>
#ifdef CONFIG_NUMA
+#include <asm/numa.h>
struct pci_bus;
int pcibus_to_node(struct pci_bus *bus);
diff --git a/arch/loongarch/include/asm/Kbuild b/arch/loongarch/include/asm/Kbuild
index c862672ed953..2804f2a2ad61 100644
--- a/arch/loongarch/include/asm/Kbuild
+++ b/arch/loongarch/include/asm/Kbuild
@@ -15,6 +15,7 @@ generic-y += fcntl.h
generic-y += ioctl.h
generic-y += ioctls.h
generic-y += mman.h
+generic-y += mmzone.h
generic-y += msgbuf.h
generic-y += sembuf.h
generic-y += shmbuf.h
diff --git a/arch/loongarch/include/asm/mmzone.h b/arch/loongarch/include/asm/mmzone.h
deleted file mode 100644
index 2b9a90727e19..000000000000
--- a/arch/loongarch/include/asm/mmzone.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Author: Huacai Chen (chenhuacai@...ngson.cn)
- * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
- */
-#ifndef _ASM_MMZONE_H_
-#define _ASM_MMZONE_H_
-
-#include <asm/page.h>
-#include <asm/numa.h>
-
-extern struct pglist_data *node_data[];
-
-#define NODE_DATA(nid) (node_data[(nid)])
-
-#endif /* _ASM_MMZONE_H_ */
diff --git a/arch/loongarch/include/asm/topology.h b/arch/loongarch/include/asm/topology.h
index 66128dec0bf6..50273c9187d0 100644
--- a/arch/loongarch/include/asm/topology.h
+++ b/arch/loongarch/include/asm/topology.h
@@ -8,6 +8,7 @@
#include <linux/smp.h>
#ifdef CONFIG_NUMA
+#include <asm/numa.h>
extern cpumask_t cpus_on_node[];
diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c
index 8fe21f868f72..acada671e020 100644
--- a/arch/loongarch/kernel/numa.c
+++ b/arch/loongarch/kernel/numa.c
@@ -27,10 +27,7 @@
#include <asm/time.h>
int numa_off;
-struct pglist_data *node_data[MAX_NUMNODES];
unsigned char node_distances[MAX_NUMNODES][MAX_NUMNODES];
-
-EXPORT_SYMBOL(node_data);
EXPORT_SYMBOL(node_distances);
static struct numa_meminfo numa_meminfo;
diff --git a/arch/mips/include/asm/mach-ip27/mmzone.h b/arch/mips/include/asm/mach-ip27/mmzone.h
index 629c3f290203..56959eb9cb26 100644
--- a/arch/mips/include/asm/mach-ip27/mmzone.h
+++ b/arch/mips/include/asm/mach-ip27/mmzone.h
@@ -24,8 +24,4 @@ extern struct node_data *__node_data[];
#define hub_data(n) (&__node_data[(n)]->hub)
-extern struct pglist_data *node_data[];
-
-#define NODE_DATA(nid) (node_data[nid])
-
#endif /* _ASM_MACH_MMZONE_H */
diff --git a/arch/mips/include/asm/mach-loongson64/mmzone.h b/arch/mips/include/asm/mach-loongson64/mmzone.h
index 2effd5f8ed62..8fb70fd3c9c4 100644
--- a/arch/mips/include/asm/mach-loongson64/mmzone.h
+++ b/arch/mips/include/asm/mach-loongson64/mmzone.h
@@ -14,10 +14,6 @@
#define pa_to_nid(addr) (((addr) & 0xf00000000000) >> NODE_ADDRSPACE_SHIFT)
#define nid_to_addrbase(nid) ((unsigned long)(nid) << NODE_ADDRSPACE_SHIFT)
-extern struct pglist_data *node_data[];
-
-#define NODE_DATA(n) (node_data[n])
-
extern void __init prom_init_numa_memory(void);
#endif /* _ASM_MACH_MMZONE_H */
diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
index 64fcfaa885b6..d56238745744 100644
--- a/arch/mips/loongson64/numa.c
+++ b/arch/mips/loongson64/numa.c
@@ -29,8 +29,6 @@
unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
EXPORT_SYMBOL(__node_distances);
-struct pglist_data *node_data[MAX_NUMNODES];
-EXPORT_SYMBOL(node_data);
cpumask_t __node_cpumask[MAX_NUMNODES];
EXPORT_SYMBOL(__node_cpumask);
diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
index eb6d2fa41a8a..1963313f55d8 100644
--- a/arch/mips/sgi-ip27/ip27-memory.c
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -34,9 +34,6 @@
#define SLOT_PFNSHIFT (SLOT_SHIFT - PAGE_SHIFT)
#define PFN_NASIDSHFT (NASID_SHFT - PAGE_SHIFT)
-struct pglist_data *node_data[MAX_NUMNODES];
-EXPORT_SYMBOL(node_data);
-
struct node_data *__node_data[MAX_NUMNODES];
EXPORT_SYMBOL(__node_data);
diff --git a/arch/powerpc/include/asm/mmzone.h b/arch/powerpc/include/asm/mmzone.h
index da827d2d0866..d99863cd6cde 100644
--- a/arch/powerpc/include/asm/mmzone.h
+++ b/arch/powerpc/include/asm/mmzone.h
@@ -20,12 +20,6 @@
#ifdef CONFIG_NUMA
-extern struct pglist_data *node_data[];
-/*
- * Return a pointer to the node data for node n.
- */
-#define NODE_DATA(nid) (node_data[nid])
-
/*
* Following are specific to this numa platform.
*/
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index a490724e84ad..8c18973cd71e 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -43,11 +43,9 @@ static char *cmdline __initdata;
int numa_cpu_lookup_table[NR_CPUS];
cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
-struct pglist_data *node_data[MAX_NUMNODES];
EXPORT_SYMBOL(numa_cpu_lookup_table);
EXPORT_SYMBOL(node_to_cpumask_map);
-EXPORT_SYMBOL(node_data);
static int primary_domain_index;
static int n_mem_addr_cells, n_mem_size_cells;
diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild
index 504f8b7e72d4..e44f168f60fc 100644
--- a/arch/riscv/include/asm/Kbuild
+++ b/arch/riscv/include/asm/Kbuild
@@ -2,6 +2,7 @@
generic-y += early_ioremap.h
generic-y += flat.h
generic-y += kvm_para.h
+generic-y += mmzone.h
generic-y += parport.h
generic-y += spinlock.h
generic-y += spinlock_types.h
diff --git a/arch/riscv/include/asm/mmzone.h b/arch/riscv/include/asm/mmzone.h
deleted file mode 100644
index fa17e01d9ab2..000000000000
--- a/arch/riscv/include/asm/mmzone.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ASM_MMZONE_H
-#define __ASM_MMZONE_H
-
-#ifdef CONFIG_NUMA
-
-#include <asm/numa.h>
-
-extern struct pglist_data *node_data[];
-#define NODE_DATA(nid) (node_data[(nid)])
-
-#endif /* CONFIG_NUMA */
-#endif /* __ASM_MMZONE_H */
diff --git a/arch/riscv/include/asm/topology.h b/arch/riscv/include/asm/topology.h
index 61183688bdd5..fe1a8bf6902d 100644
--- a/arch/riscv/include/asm/topology.h
+++ b/arch/riscv/include/asm/topology.h
@@ -4,6 +4,10 @@
#include <linux/arch_topology.h>
+#ifdef CONFIG_NUMA
+#include <asm/numa.h>
+#endif
+
/* Replace task scheduler's default frequency-invariant accounting */
#define arch_scale_freq_tick topology_scale_freq_tick
#define arch_set_freq_scale topology_set_freq_scale
diff --git a/arch/s390/include/asm/Kbuild b/arch/s390/include/asm/Kbuild
index 4b904110d27c..297bf7157968 100644
--- a/arch/s390/include/asm/Kbuild
+++ b/arch/s390/include/asm/Kbuild
@@ -7,3 +7,4 @@ generated-y += unistd_nr.h
generic-y += asm-offsets.h
generic-y += kvm_types.h
generic-y += mcs_spinlock.h
+generic-y += mmzone.h
diff --git a/arch/s390/include/asm/mmzone.h b/arch/s390/include/asm/mmzone.h
deleted file mode 100644
index 73e3e7c6976c..000000000000
--- a/arch/s390/include/asm/mmzone.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * NUMA support for s390
- *
- * Copyright IBM Corp. 2015
- */
-
-#ifndef _ASM_S390_MMZONE_H
-#define _ASM_S390_MMZONE_H
-
-#ifdef CONFIG_NUMA
-
-extern struct pglist_data *node_data[];
-#define NODE_DATA(nid) (node_data[nid])
-
-#endif /* CONFIG_NUMA */
-#endif /* _ASM_S390_MMZONE_H */
diff --git a/arch/s390/kernel/numa.c b/arch/s390/kernel/numa.c
index 23ab9f02f278..ddc1448ea2e1 100644
--- a/arch/s390/kernel/numa.c
+++ b/arch/s390/kernel/numa.c
@@ -14,9 +14,6 @@
#include <linux/node.h>
#include <asm/numa.h>
-struct pglist_data *node_data[MAX_NUMNODES];
-EXPORT_SYMBOL(node_data);
-
void __init numa_setup(void)
{
int nid;
diff --git a/arch/sh/include/asm/mmzone.h b/arch/sh/include/asm/mmzone.h
index 7b8dead2723d..63f88b465e39 100644
--- a/arch/sh/include/asm/mmzone.h
+++ b/arch/sh/include/asm/mmzone.h
@@ -5,9 +5,6 @@
#ifdef CONFIG_NUMA
#include <linux/numa.h>
-extern struct pglist_data *node_data[];
-#define NODE_DATA(nid) (node_data[nid])
-
static inline int pfn_to_nid(unsigned long pfn)
{
int nid;
diff --git a/arch/sh/mm/numa.c b/arch/sh/mm/numa.c
index 50f0dc1744d0..9bc212b5e762 100644
--- a/arch/sh/mm/numa.c
+++ b/arch/sh/mm/numa.c
@@ -14,9 +14,6 @@
#include <linux/pfn.h>
#include <asm/sections.h>
-struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
-EXPORT_SYMBOL_GPL(node_data);
-
/*
* On SH machines the conventional approach is to stash system RAM
* in node 0, and other memory blocks in to node 1 and up, ordered by
diff --git a/arch/sparc/include/asm/mmzone.h b/arch/sparc/include/asm/mmzone.h
index a236d8aa893a..74eb2c71d077 100644
--- a/arch/sparc/include/asm/mmzone.h
+++ b/arch/sparc/include/asm/mmzone.h
@@ -6,10 +6,6 @@
#include <linux/cpumask.h>
-extern struct pglist_data *node_data[];
-
-#define NODE_DATA(nid) (node_data[nid])
-
extern int numa_cpu_lookup_table[];
extern cpumask_t numa_cpumask_lookup_table[];
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 00b247d924a9..3cb698204609 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -1115,11 +1115,9 @@ static void init_node_masks_nonnuma(void)
}
#ifdef CONFIG_NUMA
-struct pglist_data *node_data[MAX_NUMNODES];
EXPORT_SYMBOL(numa_cpu_lookup_table);
EXPORT_SYMBOL(numa_cpumask_lookup_table);
-EXPORT_SYMBOL(node_data);
static int scan_pio_for_cfg_handle(struct mdesc_handle *md, u64 pio,
u32 cfg_handle)
diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
index a192bdea69e2..6c23d1661b17 100644
--- a/arch/x86/include/asm/Kbuild
+++ b/arch/x86/include/asm/Kbuild
@@ -11,3 +11,4 @@ generated-y += xen-hypercalls.h
generic-y += early_ioremap.h
generic-y += mcs_spinlock.h
+generic-y += mmzone.h
diff --git a/arch/x86/include/asm/mmzone.h b/arch/x86/include/asm/mmzone.h
deleted file mode 100644
index c41b41edd691..000000000000
--- a/arch/x86/include/asm/mmzone.h
+++ /dev/null
@@ -1,6 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifdef CONFIG_X86_32
-# include <asm/mmzone_32.h>
-#else
-# include <asm/mmzone_64.h>
-#endif
diff --git a/arch/x86/include/asm/mmzone_32.h b/arch/x86/include/asm/mmzone_32.h
deleted file mode 100644
index 2d4515e8b7df..000000000000
--- a/arch/x86/include/asm/mmzone_32.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Written by Pat Gaughen (gone@...ibm.com) Mar 2002
- *
- */
-
-#ifndef _ASM_X86_MMZONE_32_H
-#define _ASM_X86_MMZONE_32_H
-
-#include <asm/smp.h>
-
-#ifdef CONFIG_NUMA
-extern struct pglist_data *node_data[];
-#define NODE_DATA(nid) (node_data[nid])
-#endif /* CONFIG_NUMA */
-
-#endif /* _ASM_X86_MMZONE_32_H */
diff --git a/arch/x86/include/asm/mmzone_64.h b/arch/x86/include/asm/mmzone_64.h
deleted file mode 100644
index 0c585046f744..000000000000
--- a/arch/x86/include/asm/mmzone_64.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* K8 NUMA support */
-/* Copyright 2002,2003 by Andi Kleen, SuSE Labs */
-/* 2.5 Version loosely based on the NUMAQ Code by Pat Gaughen. */
-#ifndef _ASM_X86_MMZONE_64_H
-#define _ASM_X86_MMZONE_64_H
-
-#ifdef CONFIG_NUMA
-
-#include <linux/mmdebug.h>
-#include <asm/smp.h>
-
-extern struct pglist_data *node_data[];
-
-#define NODE_DATA(nid) (node_data[nid])
-
-#endif
-#endif /* _ASM_X86_MMZONE_64_H */
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 6ce10e3c6228..7de725d6bb05 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -24,9 +24,6 @@
int numa_off;
nodemask_t numa_nodes_parsed __initdata;
-struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
-EXPORT_SYMBOL(node_data);
-
static struct numa_meminfo numa_meminfo __initdata_or_meminfo;
static struct numa_meminfo numa_reserved_meminfo __initdata_or_meminfo;
diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c
index 5b59d133b6af..9b71ad2869f1 100644
--- a/drivers/base/arch_numa.c
+++ b/drivers/base/arch_numa.c
@@ -15,8 +15,6 @@
#include <asm/sections.h>
-struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
-EXPORT_SYMBOL(node_data);
nodemask_t numa_nodes_parsed __initdata;
static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
diff --git a/include/asm-generic/mmzone.h b/include/asm-generic/mmzone.h
new file mode 100644
index 000000000000..2ab5193e8394
--- /dev/null
+++ b/include/asm-generic/mmzone.h
@@ -0,0 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_GENERIC_MMZONE_H
+#define _ASM_GENERIC_MMZONE_H
+
+#endif
diff --git a/include/linux/numa.h b/include/linux/numa.h
index eb19503604fe..e5841d4057ab 100644
--- a/include/linux/numa.h
+++ b/include/linux/numa.h
@@ -30,6 +30,9 @@ static inline bool numa_valid_node(int nid)
#ifdef CONFIG_NUMA
#include <asm/sparsemem.h>
+extern struct pglist_data *node_data[];
+#define NODE_DATA(nid) (node_data[nid])
+
/* Generic implementation available */
int numa_nearest_node(int node, unsigned int state);
diff --git a/mm/numa.c b/mm/numa.c
index 67ca6b8585c0..8c157d41c026 100644
--- a/mm/numa.c
+++ b/mm/numa.c
@@ -3,6 +3,9 @@
#include <linux/printk.h>
#include <linux/numa.h>
+struct pglist_data *node_data[MAX_NUMNODES];
+EXPORT_SYMBOL(node_data);
+
/* Stub functions: */
#ifndef memory_add_physaddr_to_nid
--
2.43.0
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