This happens with threads that are offline due to CPU hotplug
(including threads that were never "plugged in" to begin with because
SMT is disabled).
Signed-off-by: Scott Wood <scottw...@freescale.com>
---
arch/powerpc/mm/mmu_context_nohash.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/mm/mmu_context_nohash.c
b/arch/powerpc/mm/mmu_context_nohash.c
index e779642..810f8e4 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -112,8 +112,10 @@ static unsigned int steal_context_smp(unsigned int id)
*/
for_each_cpu(cpu, mm_cpumask(mm)) {
for (i = cpu_first_thread_sibling(cpu);
- i <= cpu_last_thread_sibling(cpu); i++)
- __set_bit(id, stale_map[i]);
+ i <= cpu_last_thread_sibling(cpu); i++) {
+ if (stale_map[i])
+ __set_bit(id, stale_map[i]);
+ }
cpu = i - 1;
}
return id;
@@ -272,7 +274,8 @@ void switch_mmu_context(struct mm_struct *prev, struct
mm_struct *next)
/* XXX This clear should ultimately be part of
local_flush_tlb_mm */
for (i = cpu_first_thread_sibling(cpu);
i <= cpu_last_thread_sibling(cpu); i++) {
- __clear_bit(id, stale_map[i]);
+ if (stale_map[i])
+ __clear_bit(id, stale_map[i]);
}
}
--
1.7.9.5
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