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

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Message-Id: <943e73c6-cadb-cf9e-9c7f-a7b687e7177a@linux.vnet.ibm.com>
Date:   Tue, 13 Feb 2018 11:49:10 -0800
From:   Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linux-kernel@...r.kernel.org,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc/pseries: Declare optional dummy function for
 find_and_online_cpu_nid

On 02/12/2018 02:34 PM, Guenter Roeck wrote:
> 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>

Nathan already sent a patch on the 9th for this issue to the list.

-Tyrel

> ---
>  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;
>