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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-03-10 00:00:56 (GMT)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-05-27 19:58:38 (GMT)
commitcce7f1fc015a98ca9263bd5730c00258bc214e53 (patch)
tree6d7bdb35d42e3caedbaf3ce2180901258f1245fd /kernel/rcu
parentc5b5539506f86469dca08310657ca93bbb6c00a5 (diff)
downloadlinux-cce7f1fc015a98ca9263bd5730c00258bc214e53.tar.xz
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 <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e338a12..a1df68f 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;
}