From: Paul E. McKenney Date: Wed, 11 Jul 2012 12:23:18 +0000 (-0700) Subject: rcu: Adjust for unconditional ->completed assignment X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=25d30cf4250f74e5ceb35f8f39739782408db633;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git rcu: Adjust for unconditional ->completed assignment Now that the rcu_node structures' ->completed fields are unconditionally assigned at grace-period cleanup time, they should already have the correct value for the new grace period at grace-period initialization time. This commit therefore inserts a WARN_ON_ONCE() to verify this invariant. Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett --- diff --git a/kernel/rcutree.c b/kernel/rcutree.c index f0f3a18c0a20..a2eadd04fb29 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1080,6 +1080,7 @@ static int rcu_gp_init(struct rcu_state *rsp) rcu_preempt_check_blocked_tasks(rnp); rnp->qsmask = rnp->qsmaskinit; rnp->gpnum = rsp->gpnum; + WARN_ON_ONCE(rnp->completed != rsp->completed); rnp->completed = rsp->completed; if (rnp == rdp->mynode) rcu_start_gp_per_cpu(rsp, rnp, rdp); @@ -2777,7 +2778,8 @@ static void __init rcu_init_one(struct rcu_state *rsp, raw_spin_lock_init(&rnp->fqslock); lockdep_set_class_and_name(&rnp->fqslock, &rcu_fqs_class[i], fqs[i]); - rnp->gpnum = 0; + rnp->gpnum = rsp->gpnum; + rnp->completed = rsp->completed; rnp->qsmask = 0; rnp->qsmaskinit = 0; rnp->grplo = j * cpustride;