rcu: Disable preemption in rcu_blocking_is_gp()

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It is time to optimize CONFIG_TREE_PREEMPT_RCU's synchronize_rcu()
for uniprocessor optimization, which means that rcu_blocking_is_gp()
can no longer rely on RCU read-side critical sections having disabled
preemption.  This commit therefore disables preemption across
rcu_blocking_is_gp()'s scan of the cpu_online_mask.

(Updated from previous version to fix embarrassing bug spotted by
Wu Fengguang.)

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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This commit is contained in:

Paul E. McKenney 2012-06-19 11:58:27 -07:00

parent 1c17e4d443

commit 95f0c1de3e

1 changed files with 6 additions and 18 deletions

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kernel/rcutree.c

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