Commit 36b5dae6 authored Sep 18, 2019 by Paul E. McKenney

rcu: Suppress levelspread uninitialized messages



New tools bring new warnings, and with v5.3 comes:

kernel/rcu/srcutree.c: warning: 'levelspread[<U aa0>]' 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 <mpe@ellerman.id.au>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>

parent b8889c9c

kernel/rcu/rcu.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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--)

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