rcu_gp_init() is called once the gp_kthread wakes up on the condition that the init bit is set in the gp_flags. For a spurious wakeup we need to check that it is actually set. This commit ensures that the RCU_GP_FLAG_INIT bit is set in gp_flags.
Signed-off-by: Pranith Kumar <[email protected]> --- kernel/rcu/tree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 8d598a2..f8847d9 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1600,7 +1600,7 @@ static int rcu_gp_init(struct rcu_state *rsp) rcu_bind_gp_kthread(); raw_spin_lock_irq(&rnp->lock); smp_mb__after_unlock_lock(); - if (!ACCESS_ONCE(rsp->gp_flags)) { + if (!(ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_INIT)) { /* Spurious wakeup, tell caller to go back to sleep. */ raw_spin_unlock_irq(&rnp->lock); return 0; -- 2.0.0.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
