On Tue, May 24, 2016 at 03:35:44PM -0700, David Daney wrote:

quoted

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index aee323b..4b13ecd 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h

@@ -113,4 +113,12 @@ static inline const char *acpi_get_enable_method(int cpu)
 pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
 #endif

+#ifdef CONFIG_ACPI_NUMA
+int arm64_acpi_numa_init(void);
+int acpi_numa_get_nid(unsigned int cpu, u64 hwid);
+#else
+static inline int arm64_acpi_numa_init(void) { return -ENOSYS; }
+static inline int acpi_numa_get_nid(unsigned int cpu, u64 hwid) { return NUMA_NO_NODE; }
+#endif /* CONFIG_ACPI_NUMA */
+
 #endif /*_ASM_ACPI_H*/

Apparently this doesn't always build since asm/acpi.h is conditionally
included from linux/acpi.h only when CONFIG_ACPI is enabled. Disabling
this option on arm64 leads to:

arch/arm64/mm/numa.c: In function ?arm64_numa_init?:
arch/arm64/mm/numa.c:395:24: error: ?arm64_acpi_numa_init? undeclared (first use in this function)
   if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))

I'll fix it in arch/arm64 by including asm/acpi.h directly as we do in a
couple of other files:

------------------8<------------------------------
From 9a83bf400e0b4ef066b83eeaecdbca909b8491ea Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@arm.com>
Date: Mon, 15 Aug 2016 16:33:10 +0100
Subject: [PATCH] arm64: Fix NUMA build error when !CONFIG_ACPI
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Since asm/acpi.h is only included by linux/acpi.h when CONFIG_ACPI is
enabled, disabling the latter leads to the following build error on
arm64:

arch/arm64/mm/numa.c: In function ?arm64_numa_init?:
arch/arm64/mm/numa.c:395:24: error: ?arm64_acpi_numa_init? undeclared (first use in this function)
   if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))

This patch include the asm/acpi.h explicitly in arch/arm64/mm/numa.c for
the arm64_acpi_numa_init() definition.

Fixes: d8b47fca8c23 ("arm64, ACPI, NUMA: NUMA support based on SRAT and SLIT")
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/mm/numa.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index c7fe3ec70774..5bb15eab6f00 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c

@@ -23,6 +23,8 @@
 #include <linux/module.h>
 #include <linux/of.h>

+#include <asm/acpi.h>
+
 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
 EXPORT_SYMBOL(node_data);
 nodemask_t numa_nodes_parsed __initdata;