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rcu: Remove redundant offline check

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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>
This commit is contained in:
Paul E. McKenney 2015-03-09 17:00:56 -07:00
parent c5b5539506
commit cce7f1fc01
1 changed files with 0 additions and 2 deletions
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kernel/rcu/tree.c
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@ -2749,8 +2749,6 @@ static void force_qs_rnp(struct rcu_state *rsp,
bit = 1; bit = 1;
for (; cpu <= rnp->grphi; cpu++, bit <<= 1) { for (; cpu <= rnp->grphi; cpu++, bit <<= 1) {
if ((rnp->qsmask & bit) != 0) { if ((rnp->qsmask & bit) != 0) {
if ((rnp->qsmaskinit & bit) == 0)
*isidle = false; /* Pending hotplug. */
if (f(per_cpu_ptr(rsp->rda, cpu), isidle, maxj)) if (f(per_cpu_ptr(rsp->rda, cpu), isidle, maxj))
mask |= bit; mask |= bit;
} }