rcu: Apply results of code inspection of kernel/rcutree_plugin.h

o Drop the calls to cpu_quiet() from the online/offline code.
  These are unnecessary, since force_quiescent_state() will
  clean up, and removing them simplifies the code a bit.

o Add a warning to check that we don't enqueue the same blocked
  task twice onto the ->blocked_tasks[] lists.

o Rework the phase computation in rcu_preempt_note_context_switch()
  to be more readable, as suggested by Josh Triplett.

o Disable irqs to close a race between the scheduling clock
  interrupt and rcu_preempt_note_context_switch() WRT the
  ->rcu_read_unlock_special field.

o Add comments to rnp->lock acquisition and release within
  rcu_read_unlock_special() noting that irqs are already
  disabled.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
LKML-Reference: <12532926201851-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index e8624eb..ae4a553 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -767,10 +767,10 @@ cpu_quiet_msk(unsigned long mask, struct rcu_state *rsp, struct rcu_node *rnp,
 
 /*
  * Record a quiescent state for the specified CPU, which must either be
- * the current CPU or an offline CPU.  The lastcomp argument is used to
- * make sure we are still in the grace period of interest.  We don't want
- * to end the current grace period based on quiescent states detected in
- * an earlier grace period!
+ * the current CPU.  The lastcomp argument is used to make sure we are
+ * still in the grace period of interest.  We don't want to end the current
+ * grace period based on quiescent states detected in an earlier grace
+ * period!
  */
 static void
 cpu_quiet(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long lastcomp)
@@ -805,7 +805,6 @@ cpu_quiet(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long lastcomp)
                 * This GP can't end until cpu checks in, so all of our
                 * callbacks can be processed during the next GP.
                 */
-               rdp = rsp->rda[smp_processor_id()];
                rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
 
                cpu_quiet_msk(mask, rsp, rnp, flags); /* releases rnp->lock */
@@ -881,9 +880,6 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
 
        spin_unlock(&rsp->onofflock);           /* irqs remain disabled. */
 
-       /* Being offline is a quiescent state, so go record it. */
-       cpu_quiet(cpu, rsp, rdp, lastcomp);
-
        /*
         * Move callbacks from the outgoing CPU to the running CPU.
         * Note that the outgoing CPU is now quiscent, so it is now
@@ -1448,20 +1444,7 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptable)
                rnp = rnp->parent;
        } while (rnp != NULL && !(rnp->qsmaskinit & mask));
 
-       spin_unlock(&rsp->onofflock);           /* irqs remain disabled. */
-
-       /*
-        * A new grace period might start here.  If so, we will be part of
-        * it, and its gpnum will be greater than ours, so we will
-        * participate.  It is also possible for the gpnum to have been
-        * incremented before this function was called, and the bitmasks
-        * to not be filled out until now, in which case we will also
-        * participate due to our gpnum being behind.
-        */
-
-       /* Since it is coming online, the CPU is in a quiescent state. */
-       cpu_quiet(cpu, rsp, rdp, lastcomp);
-       local_irq_restore(flags);
+       spin_unlock_irqrestore(&rsp->onofflock, flags);
 }
 
 static void __cpuinit rcu_online_cpu(int cpu)

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 5f94619..cd6047c 100644 (file)
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -117,9 +117,9 @@ static void rcu_preempt_note_context_switch(int cpu)
                 * on line!
                 */
                WARN_ON_ONCE((rdp->grpmask & rnp->qsmaskinit) == 0);
-               phase = !(rnp->qsmask & rdp->grpmask) ^ (rnp->gpnum & 0x1);
+               WARN_ON_ONCE(!list_empty(&t->rcu_node_entry));
+               phase = (rnp->gpnum + !(rnp->qsmask & rdp->grpmask)) & 0x1;
                list_add(&t->rcu_node_entry, &rnp->blocked_tasks[phase]);
-               smp_mb();  /* Ensure later ctxt swtch seen after above. */
                spin_unlock_irqrestore(&rnp->lock, flags);
        }
 
@@ -133,7 +133,9 @@ static void rcu_preempt_note_context_switch(int cpu)
         * means that we continue to block the current grace period.
         */
        rcu_preempt_qs(cpu);
+       local_irq_save(flags);
        t->rcu_read_unlock_special &= ~RCU_READ_UNLOCK_NEED_QS;
+       local_irq_restore(flags);
 }
 
 /*
@@ -189,10 +191,10 @@ static void rcu_read_unlock_special(struct task_struct *t)
                 */
                for (;;) {
                        rnp = t->rcu_blocked_node;
-                       spin_lock(&rnp->lock);
+                       spin_lock(&rnp->lock);  /* irqs already disabled. */
                        if (rnp == t->rcu_blocked_node)
                                break;
-                       spin_unlock(&rnp->lock);
+                       spin_unlock(&rnp->lock);  /* irqs remain disabled. */
                }
                empty = list_empty(&rnp->blocked_tasks[rnp->gpnum & 0x1]);
                list_del_init(&t->rcu_node_entry);