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authorThomas Gleixner2018-05-29 17:49:05 +0200
committerThomas Gleixner2018-06-21 14:20:57 +0200
commitcc1fe215e1efa406b03aa4389e6269b61342dec5 (patch)
tree2e48856350405e808429badae7e8b5a286ae4ca5 /kernel/cpu.c
parentcpu/hotplug: Make bringup/teardown of smp threads symmetric (diff)
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cpu/hotplug: Split do_cpu_down()
Split out the inner workings of do_cpu_down() to allow reuse of that function for the upcoming SMT disabling mechanism. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 61396b3e9058..e266cb529c1a 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -906,20 +906,19 @@ out:
return ret;
}
+static int cpu_down_maps_locked(unsigned int cpu, enum cpuhp_state target)
+{
+ if (cpu_hotplug_disabled)
+ return -EBUSY;
+ return _cpu_down(cpu, 0, target);
+}
+
static int do_cpu_down(unsigned int cpu, enum cpuhp_state target)
{
int err;
cpu_maps_update_begin();
-
- if (cpu_hotplug_disabled) {
- err = -EBUSY;
- goto out;
- }
-
- err = _cpu_down(cpu, 0, target);
-
-out:
+ err = cpu_down_maps_locked(cpu, target);
cpu_maps_update_done();
return err;
}