sched/idle: Clear polling before descheduling the idle thread

Currently, the only real guarantee provided by the polling bit is
that, if you hold rq->lock and the polling bit is set, then you can
set need_resched to force a reschedule.

The only reason the lock is needed is that the idle thread might not
be running at all when setting its need_resched bit, and rq->lock
keeps it pinned.

This is easy to fix: just clear the polling bit before scheduling.
Now the idle thread's polling bit is only ever set when
rq->curr == rq->idle.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: nicolas.pitre@linaro.org
Cc: daniel.lezcano@linaro.org
Cc: umgwanakikbuti@gmail.com
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/b2059fcb4c613d520cb503b6fad6e47033c7c203.1401902905.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 25 insertions, 1 deletions

diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 25b9423abce9..fe4b24bf33ca 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -67,6 +67,10 @@ void __weak arch_cpu_idle(void)
  * cpuidle_idle_call - the main idle function
  *
  * NOTE: no locks or semaphores should be used here
+ *
+ * On archs that support TIF_POLLING_NRFLAG, is called with polling
+ * set, and it returns with polling set.  If it ever stops polling, it
+ * must clear the polling bit.
  */
 static void cpuidle_idle_call(void)
 {
@@ -175,10 +179,22 @@ exit_idle:
 
 /*
  * Generic idle loop implementation
+ *
+ * Called with polling cleared.
  */
 static void cpu_idle_loop(void)
 {
         while (1) {
+                /*
+                 * If the arch has a polling bit, we maintain an invariant:
+                 *
+                 * Our polling bit is clear if we're not scheduled (i.e. if
+                 * rq->curr != rq->idle).  This means that, if rq->idle has
+                 * the polling bit set, then setting need_resched is
+                 * guaranteed to cause the cpu to reschedule.
+                 */
+
+                __current_set_polling();
                 tick_nohz_idle_enter();
 
                 while (!need_resched()) {
@@ -218,6 +234,15 @@ static void cpu_idle_loop(void)
                  */
                 preempt_set_need_resched();
                 tick_nohz_idle_exit();
+                __current_clr_polling();
+
+                /*
+                 * We promise to reschedule if need_resched is set while
+                 * polling is set.  That means that clearing polling
+                 * needs to be visible before rescheduling.
+                 */
+                smp_mb__after_atomic();
+
                 schedule_preempt_disabled();
         }
 }
@@ -239,7 +264,6 @@ void cpu_startup_entry(enum cpuhp_state state)
          */
         boot_init_stack_canary();
 #endif
-        __current_set_polling();
         arch_cpu_idle_prepare();
         cpu_idle_loop();
 }