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[2/2] Revert "sched/core: Take the hotplug lock in sched_init_smp()"

Message ID 1545243796-23224-3-git-send-email-valentin.schneider@arm.com (mailing list archive)
State Mainlined, archived
Commit b5a4e2bb0f4c86bfeb38df3e1d5b2f1272f0e673
Headers show
Series System-wide mute of hotplug lockdep during init | expand

Commit Message

Valentin Schneider Dec. 19, 2018, 6:23 p.m. UTC 
This reverts commit 40fa3780bac2b654edf23f6b13f4e2dd550aea10.

Now that we have a system-wide muting of hotplug lockdep during init,
this is no longer needed.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
 kernel/sched/core.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--
2.7.4
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Patch

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e4ca15d..144b778 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5854,14 +5854,11 @@  void __init sched_init_smp(void)
 	/*
 	 * There's no userspace yet to cause hotplug operations; hence all the
 	 * CPU masks are stable and all blatant races in the below code cannot
-	 * happen. The hotplug lock is nevertheless taken to satisfy lockdep,
-	 * but there won't be any contention on it.
+	 * happen.
 	 */
-	cpus_read_lock();
 	mutex_lock(&sched_domains_mutex);
 	sched_init_domains(cpu_active_mask);
 	mutex_unlock(&sched_domains_mutex);
-	cpus_read_unlock();
 
 	/* Move init over to a non-isolated CPU */
 	if (set_cpus_allowed_ptr(current, housekeeping_cpumask(HK_FLAG_DOMAIN)) < 0)