[GIT PULL] scheduler fixes

Ingo Molnar
2010-03-13T16:42:48Z

Linus,

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

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git sched-fixes-for-linus

Thanks,

Ingo

------------------>
Dan Carpenter (1):
sched: Cleanup: remove unused variable in try_to_wake_up()

Dimitri Sivanich (1):
x86: Fix sched_clock_cpu for systems with unsynchronized TSC

Peter Zijlstra (1):
sched: Fix pick_next_highest_task_rt() for cgroups

arch/x86/kernel/cpu/intel.c | 3 ++-
kernel/sched.c | 4 ++--
kernel/sched_rt.c | 7 ++++++-
3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 879666f..7e1cca1 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -70,7 +70,8 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
if (c->x86_power & (1 << 8)) {
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
- sched_clock_stable = 1;
+ if (!check_tsc_unstable())
+ sched_clock_stable = 1;
}

/*
diff --git a/kernel/sched.c b/kernel/sched.c
index 6a212c9..2c1db81 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2359,7 +2359,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
{
int cpu, orig_cpu, this_cpu, success = 0;
unsigned long flags;
- struct rq *rq, *orig_rq;
+ struct rq *rq;

if (!sched_feat(SYNC_WAKEUPS))
wake_flags &= ~WF_SYNC;
@@ -2367,7 +2367,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
this_cpu = get_cpu();

smp_wmb();
- rq = orig_rq = task_rq_lock(p, &flags);
+ rq = task_rq_lock(p, &flags);
update_rq_clock(rq);
if (!(p->state & state))
goto out;
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index bf3e38f..c4fb42a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1146,7 +1146,12 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
if (next && next->prio < idx)
continue;
list_for_each_entry(rt_se, array->queue + idx, run_list) {
- struct task_struct *p = rt_task_of(rt_se);
+ struct task_struct *p;
+
+ if (!rt_entity_is_task(rt_se))
+ continue;
+
+ p = rt_task_of(rt_se);
if (pick_rt_task(rq, p, cpu)) {
next = p;
break;