[GIT PULL] scheduler fixes

Ingo Molnar
2018-01-12T13:48:53Z

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();