[PATCH 1/4] sched,isolcpu: make cpu_isolated_map visible outside scheduler

From: riel
Date: Mon Mar 09 2015 - 12:13:35 EST

From: Rik van Riel <riel@xxxxxxxxxx>

Needed by the next patch. Also makes cpu_isolated_map present
when compiled without SMP and/or with CONFIG_NR_CPUS=1, like
the other cpu masks.

At some point we may want to clean things up so cpumasks do
not exist in UP kernels. Maybe something for the CONFIG_TINY

Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Clark Williams <williams@xxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
Cc: cgroups@xxxxxxxxxxxxxxx
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
include/linux/sched.h | 2 ++
kernel/sched/core.c | 6 +++---
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6d77432e14ff..ca365d79480c 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -329,6 +329,8 @@ extern asmlinkage void schedule_tail(struct task_struct *prev);
extern void init_idle(struct task_struct *idle, int cpu);
extern void init_idle_bootup_task(struct task_struct *idle);

+extern cpumask_var_t cpu_isolated_map;
extern int runqueue_is_locked(int cpu);

#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f0f831e8a345..b578bb23410b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -306,6 +306,9 @@ __read_mostly int scheduler_running;
int sysctl_sched_rt_runtime = 950000;

+/* cpus with isolated domains */
+cpumask_var_t cpu_isolated_map;
* this_rq_lock - lock this runqueue and disable interrupts.
@@ -5811,9 +5814,6 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)

-/* cpus with isolated domains */
-static cpumask_var_t cpu_isolated_map;
/* Setup the mask of cpus configured for isolated domains */
static int __init isolated_cpu_setup(char *str)

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