[GIT PULL] scheduler fixes

[Ingo Molnar]

Linus,

Please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
sched-urgent-for-linus

   # HEAD: 541676078b52f365f53d46ee5517d305cd1b6350 membarrier: Disable 
preemption when calling smp_call_function_many()

A Kconfig fix, a build fix and a membarrier bug fix.

 Thanks,

        Ingo

------------------>
Geert Uytterhoeven (1):
      sched/isolation: Make CONFIG_CPU_ISOLATION=y depend on SMP or COMPILE_TEST

Mathieu Desnoyers (1):
      membarrier: Disable preemption when calling smp_call_function_many()

Valentin Ilie (1):
      ia64, sched/cputime: Fix build error if 
CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y


 arch/ia64/kernel/time.c   | 2 +-
 init/Kconfig              | 1 +
 kernel/sched/membarrier.c | 2 ++
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index c6ecb97151a2..9025699049ca 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -88,7 +88,7 @@ void vtime_flush(struct task_struct *tsk)
        }
 
        if (ti->softirq_time) {
-               delta = cycle_to_nsec(ti->softirq_time));
+               delta = cycle_to_nsec(ti->softirq_time);
                account_system_index_time(tsk, delta, CPUTIME_SOFTIRQ);
        }
 
diff --git a/init/Kconfig b/init/Kconfig
index 690a381adee0..c1221332e128 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -461,6 +461,7 @@ endmenu # "CPU/Task time and stats accounting"
 
 config CPU_ISOLATION
        bool "CPU isolation"
+       depends on SMP || COMPILE_TEST
        default y
        help
          Make sure that CPUs running critical tasks are not disturbed by
diff --git a/kernel/sched/membarrier.c b/kernel/sched/membarrier.c
index dd7908743dab..9bcbacba82a8 100644
--- a/kernel/sched/membarrier.c
+++ b/kernel/sched/membarrier.c
@@ -89,7 +89,9 @@ static int membarrier_private_expedited(void)
                rcu_read_unlock();
        }
        if (!fallback) {
+               preempt_disable();
                smp_call_function_many(tmpmask, ipi_mb, NULL, 1);
+               preempt_enable();
                free_cpumask_var(tmpmask);
        }
        cpus_read_unlock();