diff options
| author | Zqiang <qiang1.zhang@intel.com> | 2022-12-15 06:57:55 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-01-04 04:28:34 +0300 |
| commit | 3d1adf7ada352b80e037509d26cdca156f75e830 (patch) | |
| tree | 015b1388da4ad7022a285454156239546f1d25f8 /kernel | |
| parent | 2d7f00b2f01301d6e41fd4a28030dab0442265be (diff) | |
| download | linux-3d1adf7ada352b80e037509d26cdca156f75e830.tar.xz | |
rcu: Make rcu_blocking_is_gp() stop early-boot might_sleep()
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcu/tree.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 0147e69ea85a..15f976506472 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -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; } |