linux-kernel - [PATCH 2/2] powerpc/pseries: Declare optional dummy function for find_and_online_cpu

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Message-Id: <1518474848-3158-2-git-send-email-linux@roeck-us.net>
Date:   Mon, 12 Feb 2018 14:34:08 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>
Subject: [PATCH 2/2] powerpc/pseries: Declare optional dummy function for find_and_online_cpu_nid

Commit e67e02a544e9 ("powerpc/pseries: Fix cpu hotplug crash with
memoryless nodes") adds an unconditional call to find_and_online_cpu_nid(),
which is only declared if CONFIG_PPC_SPLPAR is enabled. This results in
the following build error if this is not the case.

arch/powerpc/platforms/pseries/hotplug-cpu.o: In function `dlpar_online_cpu':
arch/powerpc/platforms/pseries/hotplug-cpu.c:369:
			undefined reference to `.find_and_online_cpu_nid'

Follow the guideline provided by similar functions and provide a dummy
function if CONFIG_PPC_SPLPAR is not enabled. This also moves the external
function declaration into an include file where it should be.

Fixes: e67e02a544e9 ("powerpc/pseries: Fix cpu hotplug crash with ...")
Cc: Michael Bringmann <mwb@...ux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 arch/powerpc/include/asm/topology.h          | 5 +++++
 arch/powerpc/platforms/pseries/hotplug-cpu.c | 2 --
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 88187c285c70..52815982436f 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -82,6 +82,7 @@ static inline int numa_update_cpu_topology(bool cpus_locked)
 extern int start_topology_update(void);
 extern int stop_topology_update(void);
 extern int prrn_is_enabled(void);
+extern int find_and_online_cpu_nid(int cpu);
 #else
 static inline int start_topology_update(void)
 {
@@ -95,6 +96,10 @@ static inline int prrn_is_enabled(void)
 {
 	return 0;
 }
+static inline int find_and_online_cpu_nid(int cpu)
+{
+	return 0;
+}
 #endif /* CONFIG_NUMA && CONFIG_PPC_SPLPAR */
 
 #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_NEED_MULTIPLE_NODES)
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index dceb51454d8d..f5c6a8cd2926 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -340,8 +340,6 @@ static void pseries_remove_processor(struct device_node *np)
 	cpu_maps_update_done();
 }
 
-extern int find_and_online_cpu_nid(int cpu);
-
 static int dlpar_online_cpu(struct device_node *dn)
 {
 	int rc = 0;
-- 
2.7.4