[GIT PULL] scheduler fixes

Ingo Molnar
2009-12-21T18:07:32Z

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

------------------>
Peter Zijlstra (2):
sched: Restore printk sanity
sched: Fix hotplug hang

kernel/sched.c | 91 ++++++++++++++++++++++++++---------------------
kernel/sched_idletask.c | 2 +-
2 files changed, 51 insertions(+), 42 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 720df10..87f1f47 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -26,8 +26,6 @@
* Thomas Gleixner, Mike Kravetz
*/

-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/nmi.h>
@@ -2348,7 +2346,7 @@ int select_task_rq(struct task_struct *p, int sd_flags, int wake_flags)
* not worry about this generic constraint ]
*/
if (unlikely(!cpumask_test_cpu(cpu, &p->cpus_allowed) ||
- !cpu_active(cpu)))
+ !cpu_online(cpu)))
cpu = select_fallback_rq(task_cpu(p), p);

return cpu;
@@ -5375,8 +5373,8 @@ static noinline void __schedule_bug(struct task_struct *prev)
{
struct pt_regs *regs = get_irq_regs();

- pr_err("BUG: scheduling while atomic: %s/%d/0x%08x\n",
- prev->comm, prev->pid, preempt_count());
+ printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n",
+ prev->comm, prev->pid, preempt_count());

debug_show_held_locks(prev);
print_modules();
@@ -6940,23 +6938,23 @@ void sched_show_task(struct task_struct *p)
unsigned state;

state = p->state ? __ffs(p->state) + 1 : 0;
- pr_info("%-13.13s %c", p->comm,
+ printk(KERN_INFO "%-13.13s %c", p->comm,
state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?');
#if BITS_PER_LONG == 32
if (state == TASK_RUNNING)
- pr_cont(" running ");
+ printk(KERN_CONT " running ");
else
- pr_cont(" %08lx ", thread_saved_pc(p));
+ printk(KERN_CONT " %08lx ", thread_saved_pc(p));
#else
if (state == TASK_RUNNING)
- pr_cont(" running task ");
+ printk(KERN_CONT " running task ");
else
- pr_cont(" %016lx ", thread_saved_pc(p));
+ printk(KERN_CONT " %016lx ", thread_saved_pc(p));
#endif
#ifdef CONFIG_DEBUG_STACK_USAGE
free = stack_not_used(p);
#endif
- pr_cont("%5lu %5d %6d 0x%08lx\n", free,
+ printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free,
task_pid_nr(p), task_pid_nr(p->real_parent),
(unsigned long)task_thread_info(p)->flags);

@@ -6968,9 +6966,11 @@ void show_state_filter(unsigned long state_filter)
struct task_struct *g, *p;

#if BITS_PER_LONG == 32
- pr_info(" task PC stack pid father\n");
+ printk(KERN_INFO
+ " task PC stack pid father\n");
#else
- pr_info(" task PC stack pid father\n");
+ printk(KERN_INFO
+ " task PC stack pid father\n");
#endif
read_lock(&tasklist_lock);
do_each_thread(g, p) {
@@ -7828,44 +7828,48 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
printk(KERN_DEBUG "%*s domain %d: ", level, "", level);

if (!(sd->flags & SD_LOAD_BALANCE)) {
- pr_cont("does not load-balance\n");
+ printk("does not load-balance\n");
if (sd->parent)
- pr_err("ERROR: !SD_LOAD_BALANCE domain has parent\n");
+ printk(KERN_ERR "ERROR: !SD_LOAD_BALANCE domain"
+ " has parent");
return -1;
}

- pr_cont("span %s level %s\n", str, sd->name);
+ printk(KERN_CONT "span %s level %s\n", str, sd->name);

if (!cpumask_test_cpu(cpu, sched_domain_span(sd))) {
- pr_err("ERROR: domain->span does not contain CPU%d\n", cpu);
+ printk(KERN_ERR "ERROR: domain->span does not contain "
+ "CPU%d\n", cpu);
}
if (!cpumask_test_cpu(cpu, sched_group_cpus(group))) {
- pr_err("ERROR: domain->groups does not contain CPU%d\n", cpu);
+ printk(KERN_ERR "ERROR: domain->groups does not contain"
+ " CPU%d\n", cpu);
}

printk(KERN_DEBUG "%*s groups:", level + 1, "");
do {
if (!group) {
- pr_cont("\n");
- pr_err("ERROR: group is NULL\n");
+ printk("\n");
+ printk(KERN_ERR "ERROR: group is NULL\n");
break;
}

if (!group->cpu_power) {
- pr_cont("\n");
- pr_err("ERROR: domain->cpu_power not set\n");
+ printk(KERN_CONT "\n");
+ printk(KERN_ERR "ERROR: domain->cpu_power not "
+ "set\n");
break;
}

if (!cpumask_weight(sched_group_cpus(group))) {
- pr_cont("\n");
- pr_err("ERROR: empty group\n");
+ printk(KERN_CONT "\n");
+ printk(KERN_ERR "ERROR: empty group\n");
break;
}

if (cpumask_intersects(groupmask, sched_group_cpus(group))) {
- pr_cont("\n");
- pr_err("ERROR: repeated CPUs\n");
+ printk(KERN_CONT "\n");
+ printk(KERN_ERR "ERROR: repeated CPUs\n");
break;
}

@@ -7873,21 +7877,23 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,

cpulist_scnprintf(str, sizeof(str), sched_group_cpus(group));

- pr_cont(" %s", str);
+ printk(KERN_CONT " %s", str);
if (group->cpu_power != SCHED_LOAD_SCALE) {
- pr_cont(" (cpu_power = %d)", group->cpu_power);
+ printk(KERN_CONT " (cpu_power = %d)",
+ group->cpu_power);
}

group = group->next;
} while (group != sd->groups);
- pr_cont("\n");
+ printk(KERN_CONT "\n");

if (!cpumask_equal(sched_domain_span(sd), groupmask))
- pr_err("ERROR: groups don't span domain->span\n");
+ printk(KERN_ERR "ERROR: groups don't span domain->span\n");

if (sd->parent &&
!cpumask_subset(groupmask, sched_domain_span(sd->parent)))
- pr_err("ERROR: parent span is not a superset of domain->span\n");
+ printk(KERN_ERR "ERROR: parent span is not a superset "
+ "of domain->span\n");
return 0;
}

@@ -8443,7 +8449,8 @@ static int build_numa_sched_groups(struct s_data *d,
sg = kmalloc_node(sizeof(struct sched_group) + cpumask_size(),
GFP_KERNEL, num);
if (!sg) {
- pr_warning("Can not alloc domain group for node %d\n", num);
+ printk(KERN_WARNING "Can not alloc domain group for node %d\n",
+ num);
return -ENOMEM;
}
d->sched_group_nodes[num] = sg;
@@ -8472,8 +8479,8 @@ static int build_numa_sched_groups(struct s_data *d,
sg = kmalloc_node(sizeof(struct sched_group) + cpumask_size(),
GFP_KERNEL, num);
if (!sg) {
- pr_warning("Can not alloc domain group for node %d\n",
- j);
+ printk(KERN_WARNING
+ "Can not alloc domain group for node %d\n", j);
return -ENOMEM;
}
sg->cpu_power = 0;
@@ -8701,7 +8708,7 @@ static enum s_alloc __visit_domain_allocation_hell(struct s_data *d,
d->sched_group_nodes = kcalloc(nr_node_ids,
sizeof(struct sched_group *), GFP_KERNEL);
if (!d->sched_group_nodes) {
- pr_warning("Can not alloc sched group node list\n");
+ printk(KERN_WARNING "Can not alloc sched group node list\n");
return sa_notcovered;
}
sched_group_nodes_bycpu[cpumask_first(cpu_map)] = d->sched_group_nodes;
@@ -8718,7 +8725,7 @@ static enum s_alloc __visit_domain_allocation_hell(struct s_data *d,
return sa_send_covered;
d->rd = alloc_rootdomain();
if (!d->rd) {
- pr_warning("Cannot alloc root domain\n");
+ printk(KERN_WARNING "Cannot alloc root domain\n");
return sa_tmpmask;
}
return sa_rootdomain;
@@ -9700,11 +9707,13 @@ void __might_sleep(char *file, int line, int preempt_offset)
return;
prev_jiffy = jiffies;

- pr_err("BUG: sleeping function called from invalid context at %s:%d\n",
- file, line);
- pr_err("in_atomic(): %d, irqs_disabled(): %d, pid: %d, name: %s\n",
- in_atomic(), irqs_disabled(),
- current->pid, current->comm);
+ printk(KERN_ERR
+ "BUG: sleeping function called from invalid context at %s:%d\n",
+ file, line);
+ printk(KERN_ERR
+ "in_atomic(): %d, irqs_disabled(): %d, pid: %d, name: %s\n",
+ in_atomic(), irqs_disabled(),
+ current->pid, current->comm);

debug_show_held_locks(current);
if (irqs_disabled())
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 21b969a..5f93b57 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -35,7 +35,7 @@ static void
dequeue_task_idle(struct rq *rq, struct task_struct *p, int sleep)
{
raw_spin_unlock_irq(&rq->lock);
- pr_err("bad: scheduling from the idle thread!\n");
+ printk(KERN_ERR "bad: scheduling from the idle thread!\n");
dump_stack();
raw_spin_lock_irq(&rq->lock);
}