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rcu: Shut up spurious gcc uninitialized-variable warning

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Because gcc doesn't realize that rcu_num_lvls must be strictly greater
than zero, some versions give a spurious warning about levelcnt[0] being
uninitialized in rcu_init_one().  This commit updates the condition on
the pre-existing panic() in order to educate gcc on this point.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2015-03-09 16:51:17 -07:00
parent eab128e830
commit 3eaaaf6cd6
1 changed files with 3 additions and 3 deletions
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6
kernel/rcu/tree.c
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@ -3982,9 +3982,9 @@ static void __init rcu_init_one(struct rcu_state *rsp,
BUILD_BUG_ON(MAX_RCU_LVLS > ARRAY_SIZE(buf)); /* Fix buf[] init! */ BUILD_BUG_ON(MAX_RCU_LVLS > ARRAY_SIZE(buf)); /* Fix buf[] init! */
/* Silence gcc 4.8 warning about array index out of range. */ /* Silence gcc 4.8 false positive about array index out of range. */
if (rcu_num_lvls > RCU_NUM_LVLS) if (rcu_num_lvls <= 0 || rcu_num_lvls > RCU_NUM_LVLS)
panic("rcu_init_one: rcu_num_lvls overflow"); panic("rcu_init_one: rcu_num_lvls out of range");
/* Initialize the level-tracking arrays. */ /* Initialize the level-tracking arrays. */