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authorValentin Schneider <valentin.schneider@arm.com>2018-12-19 18:23:16 +0000
committerIngo Molnar <mingo@kernel.org>2019-01-21 11:18:54 +0100
commitb5a4e2bb0f4c86bfeb38df3e1d5b2f1272f0e673 (patch)
tree2a674ac8cbb2426b545b94cde144161a009ca0d4 /kernel/sched
parentce48c457b95316b9a01b5aa9d4456ce820df94b4 (diff)
Revert "sched/core: Take the hotplug lock in sched_init_smp()"
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> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: cai@gmx.us Cc: daniel.lezcano@linaro.org Cc: dietmar.eggemann@arm.com Cc: linux-arm-kernel@lists.infradead.org Cc: longman@redhat.com Cc: marc.zyngier@arm.com Cc: mark.rutland@arm.com Link: https://lkml.kernel.org/r/1545243796-23224-3-git-send-email-valentin.schneider@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b05eef7d7a1f..3c8b4dba3d2d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5867,14 +5867,11 @@ 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)