[PATCH] powerpc/pseries: Fix build error when NUMA=n

As reported by lkp, if NUMA=n we see a build error:

   arch/powerpc/platforms/pseries/hotplug-cpu.c: In function 'pseries_cpu_hotplug_init':
   arch/powerpc/platforms/pseries/hotplug-cpu.c:1022:8: error: 'node_to_cpumask_map' undeclared
    1022 |        node_to_cpumask_map[node]);

Use cpumask_of_node() which has an empty stub for NUMA=n, and when
NUMA=y does a lookup from node_to_cpumask_map[].

Fixes: bd1dd4c5f528 ("powerpc/pseries: Prevent free CPU ids being reused on another node")
Reported-by: kernel test robot <redacted>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/platforms/pseries/hotplug-cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 1ef40ef699a6..d646c22e94ab 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c

@@ -1021,7 +1021,7 @@ static int __init pseries_cpu_hotplug_init(void)
 			/* Record ids of CPU added at boot time */
 			cpumask_or(node_recorded_ids_map[node],
 				   node_recorded_ids_map[node],
-				   node_to_cpumask_map[node]);
+				   cpumask_of_node(node));
 		}
 
 		of_reconfig_notifier_register(&pseries_smp_nb);

-- 
2.25.1

On Mon, 16 Aug 2021 14:10:32 +1000, Michael Ellerman wrote:

As reported by lkp, if NUMA=n we see a build error:

   arch/powerpc/platforms/pseries/hotplug-cpu.c: In function 'pseries_cpu_hotplug_init':
   arch/powerpc/platforms/pseries/hotplug-cpu.c:1022:8: error: 'node_to_cpumask_map' undeclared
    1022 |        node_to_cpumask_map[node]);

Use cpumask_of_node() which has an empty stub for NUMA=n, and when
NUMA=y does a lookup from node_to_cpumask_map[].

[...]

Applied to powerpc/next.

[1/1] powerpc/pseries: Fix build error when NUMA=n
      https://git.kernel.org/powerpc/c/8b893ef190b0c440877de04f767efca4bf4d6af8

cheers

Le 27/08/2021 à 15:15, Michael Ellerman a écrit :

On Mon, 16 Aug 2021 14:10:32 +1000, Michael Ellerman wrote:

quoted

As reported by lkp, if NUMA=n we see a build error:

    arch/powerpc/platforms/pseries/hotplug-cpu.c: In function 'pseries_cpu_hotplug_init':
    arch/powerpc/platforms/pseries/hotplug-cpu.c:1022:8: error: 'node_to_cpumask_map' undeclared
     1022 |        node_to_cpumask_map[node]);

Use cpumask_of_node() which has an empty stub for NUMA=n, and when
NUMA=y does a lookup from node_to_cpumask_map[].

[...]

Applied to powerpc/next.

[1/1] powerpc/pseries: Fix build error when NUMA=n
       https://git.kernel.org/powerpc/c/8b893ef190b0c440877de04f767efca4bf4d6af8

cheers

Thanks, Michael, for fixing my bugs !