[Xen-devel] [PATCH v2 09/10] xen/arm: Free memory allocated for sibling/core maps on CPU hot-unplug

[Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>]

The memory allocated in setup_cpu_sibling_map() when a CPU is hotplugged
has to be freed when the CPU is hot-unplugged. This is done in
remove_cpu_sibling_map() and called from __cpu_disable() on CPU hot-unplug.

Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>

---
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/smpboot.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index b4ed479dc6..d01b51592d 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -89,6 +89,12 @@ static void setup_cpu_sibling_map(int cpu)
     cpumask_set_cpu(cpu, per_cpu(cpu_core_mask, cpu));
 }
 
+static void remove_cpu_sibling_map(int cpu)
+{
+    free_cpumask_var(per_cpu(cpu_sibling_mask, cpu));
+    free_cpumask_var(per_cpu(cpu_core_mask, cpu));
+}
+
 void __init
 smp_clear_cpu_maps (void)
 {
@@ -391,6 +397,8 @@ void __cpu_disable(void)
     /* It's now safe to remove this processor from the online map */
     cpumask_clear_cpu(cpu, &cpu_online_map);
 
+    remove_cpu_sibling_map(cpu);
+
     if ( cpu_disable_scheduler(cpu) )
         BUG();
     smp_mb();
-- 
2.13.0


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