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rcu: Make rcu_blocking_is_gp() stop early-boot might_sleep()

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Currently, rcu_blocking_is_gp() invokes might_sleep() even during early
boot when interrupts are disabled and before the scheduler is scheduling.
This is at best an accident waiting to happen.  Therefore, this commit
moves that might_sleep() under an rcu_scheduler_active check in order
to ensure that might_sleep() is not invoked unless sleeping might actually
happen.

Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Zqiang 2022-12-15 11:57:55 +08:00 committed by Paul E. McKenney
parent 2d7f00b2f0
commit 3d1adf7ada
1 changed files with 3 additions and 2 deletions
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5
kernel/rcu/tree.c
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@ -3333,9 +3333,10 @@ void __init kfree_rcu_scheduler_running(void)
*/
static int rcu_blocking_is_gp(void)
{
if (rcu_scheduler_active != RCU_SCHEDULER_INACTIVE)
if (rcu_scheduler_active != RCU_SCHEDULER_INACTIVE) {
might_sleep();
return false;
might_sleep(); /* Check for RCU read-side critical section. */
}
return true;
}