sched: Fix the relax_domain_level boot parameter

commit a841f8cef4bb124f0f5563314d0beaf2e1249d72 upstream.

It does not get processed because sched_domain_level_max is 0 at the
time that setup_relax_domain_level() is run.

Simply accept the value as it is, as we don't know the value of
sched_domain_level_max until sched domain construction is completed.

Fix sched_relax_domain_level in cpuset.  The build_sched_domain() routine calls
the set_domain_attribute() routine prior to setting the sd->level, however,
the set_domain_attribute() routine relies on the sd->level to decide whether
idle load balancing will be off/on.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120605184436.GA15668@sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/sched.c b/kernel/sched.c
index 03dff14..8ef48f0 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7220,11 +7220,8 @@ int sched_domain_level_max;
 
 static int __init setup_relax_domain_level(char *str)
 {
-       unsigned long val;
-
-       val = simple_strtoul(str, NULL, 0);
-       if (val < sched_domain_level_max)
-               default_relax_domain_level = val;
+       if (kstrtoint(str, 0, &default_relax_domain_level))
+               pr_warn("Unable to set relax_domain_level\n");
 
        return 1;
 }
@@ -7417,7 +7414,6 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
        if (!sd)
                return child;
 
-       set_domain_attribute(sd, attr);
        cpumask_and(sched_domain_span(sd), cpu_map, tl->mask(cpu));
        if (child) {
                sd->level = child->level + 1;
@@ -7425,6 +7421,7 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
                child->parent = sd;
        }
        sd->child = child;
+       set_domain_attribute(sd, attr);
 
        return sd;
 }