From 36b5dae64513b7ce3a0e0f6cb469e0f74bacad45 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Wed, 18 Sep 2019 10:10:31 -0700 Subject: [PATCH] rcu: Suppress levelspread uninitialized messages New tools bring new warnings, and with v5.3 comes: kernel/rcu/srcutree.c: warning: 'levelspread[]' may be used uninitialized in this function [-Wuninitialized]: => 121:34 This commit suppresses this warning by initializing the full array to INT_MIN, which will result in failures should any out-of-bounds references appear. Reported-by: Michael Ellerman Reported-by: Geert Uytterhoeven Signed-off-by: Paul E. McKenney Reviewed-by: Geert Uytterhoeven --- kernel/rcu/rcu.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index 8fd4f82c9b3d..b64c707f6065 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -299,6 +299,8 @@ static inline void rcu_init_levelspread(int *levelspread, const int *levelcnt) { int i; + for (i = 0; i < RCU_NUM_LVLS; i++) + levelspread[i] = INT_MIN; if (rcu_fanout_exact) { levelspread[rcu_num_lvls - 1] = rcu_fanout_leaf; for (i = rcu_num_lvls - 2; i >= 0; i--)