Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86

* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86:
  ACPI: move timer broadcast before busmaster disable
  clockevents: warn once when program_event() is called with negative expiry
  hrtimers: avoid overflow for large relative timeouts

3 files changed, 27 insertions, 5 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index b1fbee3f7fe1..2fe34cc73c13 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -531,6 +531,11 @@ static void acpi_processor_idle(void)
 
         case ACPI_STATE_C3:
                 /*
+                 * Must be done before busmaster disable as we might
+                 * need to access HPET !
+                 */
+                acpi_state_timer_broadcast(pr, cx, 1);
+                /*
                  * disable bus master
                  * bm_check implies we need ARB_DIS
                  * !bm_check implies we need cache flush
@@ -557,7 +562,6 @@ static void acpi_processor_idle(void)
                 /* Get start time (ticks) */
                 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
                 /* Invoke C3 */
-                acpi_state_timer_broadcast(pr, cx, 1);
                 /* Tell the scheduler that we are going deep-idle: */
                 sched_clock_idle_sleep_event();
                 acpi_cstate_enter(cx);
@@ -1401,9 +1405,6 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
         if (acpi_idle_suspend)
                 return(acpi_idle_enter_c1(dev, state));
 
-        if (pr->flags.bm_check)
-                acpi_idle_update_bm_rld(pr, cx);
-
         local_irq_disable();
         current_thread_info()->status &= ~TS_POLLING;
         /*
@@ -1418,13 +1419,21 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
                 return 0;
         }
 
+        /*
+         * Must be done before busmaster disable as we might need to
+         * access HPET !
+         */
+        acpi_state_timer_broadcast(pr, cx, 1);
+
+        if (pr->flags.bm_check)
+                acpi_idle_update_bm_rld(pr, cx);
+
         if (cx->type == ACPI_STATE_C3)
                 ACPI_FLUSH_CPU_CACHE();
 
         t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
         /* Tell the scheduler that we are going deep-idle: */
         sched_clock_idle_sleep_event();
-        acpi_state_timer_broadcast(pr, cx, 1);
         acpi_idle_do_entry(cx);
         t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
 
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 22a25142e4cf..e65dd0b47cdc 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -850,6 +850,14 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 #ifdef CONFIG_TIME_LOW_RES
                 tim = ktime_add(tim, base->resolution);
 #endif
+                /*
+                 * Careful here: User space might have asked for a
+                 * very long sleep, so the add above might result in a
+                 * negative number, which enqueues the timer in front
+                 * of the queue.
+                 */
+                if (tim.tv64 < 0)
+                        tim.tv64 = KTIME_MAX;
         }
         timer->expires = tim;
 
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 822beebe664a..5fb139fef9fa 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -78,6 +78,11 @@ int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
         unsigned long long clc;
         int64_t delta;
 
+        if (unlikely(expires.tv64 < 0)) {
+                WARN_ON_ONCE(1);
+                return -ETIME;
+        }
+
         delta = ktime_to_ns(ktime_sub(expires, now));
 
         if (delta <= 0)