Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler changes for v3.4 from Ingo Molnar

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
  printk: Make it compile with !CONFIG_PRINTK
  sched/x86: Fix overflow in cyc2ns_offset
  sched: Fix nohz load accounting -- again!
  sched: Update yield() docs
  printk/sched: Introduce special printk_sched() for those awkward moments
  sched/nohz: Correctly initialize 'next_balance' in 'nohz' idle balancer
  sched: Cleanup cpu_active madness
  sched: Fix load-balance wreckage
  sched: Clean up parameter passing of proc_sched_autogroup_set_nice()
  sched: Ditch per cgroup task lists for load-balancing
  sched: Rename load-balancing fields
  sched: Move load-balancing arguments into helper struct
  sched/rt: Do not submit new work when PI-blocked
  sched/rt: Prevent idle task boosting
  sched/wait: Add __wake_up_all_locked() API
  sched/rt: Document scheduler related skip-resched-check sites
  sched/rt: Use schedule_preempt_disabled()
  sched/rt: Add schedule_preempt_disabled()
  sched/rt: Do not throttle when PI boosting
  sched/rt: Keep period timer ticking when rt throttling is active
  ...

4 files changed, 4 insertions, 20 deletions

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index c08d1ff12b7..49888fefe79 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -119,9 +119,7 @@ void cpu_idle(void)
                 }
                 rcu_idle_exit();
                 tick_nohz_idle_exit();
-                preempt_enable_no_resched();
-                schedule();
-                preempt_disable();
+                schedule_preempt_disabled();
         }
 }
 
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index cfa5c90c01d..e34257c70c2 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -156,9 +156,7 @@ void cpu_idle(void)
                 }
 
                 tick_nohz_idle_exit();
-                preempt_enable_no_resched();
-                schedule();
-                preempt_disable();
+                schedule_preempt_disabled();
         }
 }
 
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 66d250c00d1..58f78165d30 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -291,19 +291,6 @@ notrace static void __cpuinit start_secondary(void *unused)
         per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
         x86_platform.nmi_init();
 
-        /*
-         * Wait until the cpu which brought this one up marked it
-         * online before enabling interrupts. If we don't do that then
-         * we can end up waking up the softirq thread before this cpu
-         * reached the active state, which makes the scheduler unhappy
-         * and schedule the softirq thread on the wrong cpu. This is
-         * only observable with forced threaded interrupts, but in
-         * theory it could also happen w/o them. It's just way harder
-         * to achieve.
-         */
-        while (!cpumask_test_cpu(smp_processor_id(), cpu_active_mask))
-                cpu_relax();
-
         /* enable local interrupts */
         local_irq_enable();
 
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index a62c201c97e..183c5925a9f 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -620,7 +620,8 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
 
         if (cpu_khz) {
                 *scale = (NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR)/cpu_khz;
-                *offset = ns_now - (tsc_now * *scale >> CYC2NS_SCALE_FACTOR);
+                *offset = ns_now - mult_frac(tsc_now, *scale,
+                                             (1UL << CYC2NS_SCALE_FACTOR));
         }
 
         sched_clock_idle_wakeup_event(0);