From cce7f1fc015a98ca9263bd5730c00258bc214e53 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 9 Mar 2015 17:00:56 -0700 Subject: [PATCH] rcu: Remove redundant offline check Because offline CPUs are propagated up the rcu_node tree's ->qsmaskinit bits just before each grace period starts, the ->qsmaskinit bit cannot be clear when the corresponding ->qsmask bit is set. Furthermore, this condition used to correspond to a CPU that was on its way offline, and making RCU's notion of an offline CPU more precise has eliminated this situation. This commit therefore removes the now-redundant offline check from force_qs_rnp(). Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index e338a12c3a1b..a1df68fce545 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2749,8 +2749,6 @@ static void force_qs_rnp(struct rcu_state *rsp, bit = 1; for (; cpu <= rnp->grphi; cpu++, bit <<= 1) { if ((rnp->qsmask & bit) != 0) { - if ((rnp->qsmaskinit & bit) == 0) - *isidle = false; /* Pending hotplug. */ if (f(per_cpu_ptr(rsp->rda, cpu), isidle, maxj)) mask |= bit; } -- 2.20.1