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authorScott Wood <scottwood@freescale.com>2013-03-20 19:06:12 -0500
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-20 16:55:10 +1000
commit39a421ff0b7cb056e687894a9d5f57aa1303e1c8 (patch)
treeede72853ac4ea78efe931da8076dddf4d8b31819 /arch
parent35fd219a268cc82cef842518cd64ea6949629ba2 (diff)
powerpc/mm/nohash: Ignore NULL stale_map entries
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 <scottwood@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/mmu_context_nohash.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index e779642c25e5..810f8e4d74d4 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]);
}
}