percpu: make pcpu_build_alloc_info() clear static buffers

pcpu_build_alloc_info() may be called multiple times when percpu is
falling back to different first chunk allocator.  Make it clear static
buffers so that they don't contain values from previous runs.

Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/mm/percpu.c b/mm/percpu.c
index e5c4cbd..a64133f 100644 (file)
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1347,6 +1347,10 @@ struct pcpu_alloc_info * __init pcpu_build_alloc_info(
        struct pcpu_alloc_info *ai;
        unsigned int *cpu_map;
 
+       /* this function may be called multiple times */
+       memset(group_map, 0, sizeof(group_map));
+       memset(group_cnt, 0, sizeof(group_map));
+
        /*
         * Determine min_unit_size, alloc_size and max_upa such that
         * alloc_size is multiple of atom_size and is the smallest