percpu: clear memory allocated with the km allocator

Percpu allocator should clear memory before returning it but the km
allocator forgot to do it.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/mm/percpu-km.c b/mm/percpu-km.c
index 7037bc7..89633fe 100644
--- a/mm/percpu-km.c
+++ b/mm/percpu-km.c
@@ -35,7 +35,11 @@
 
 static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
 {
-	/* noop */
+	unsigned int cpu;
+
+	for_each_possible_cpu(cpu)
+		memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
+
 	return 0;
 }