Commit-ID: b5a4e2bb0f4c86bfeb38df3e1d5b2f1272f0e673 Gitweb: https://git.kernel.org/tip/b5a4e2bb0f4c86bfeb38df3e1d5b2f1272f0e673 Author: Valentin Schneider <valentin.schneider@xxxxxxx> AuthorDate: Wed, 19 Dec 2018 18:23:16 +0000 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Mon, 21 Jan 2019 11:18:54 +0100 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@xxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx> Cc: cai@xxxxxx Cc: daniel.lezcano@xxxxxxxxxx Cc: dietmar.eggemann@xxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: longman@xxxxxxxxxx Cc: marc.zyngier@xxxxxxx Cc: mark.rutland@xxxxxxx Link: https://lkml.kernel.org/r/1545243796-23224-3-git-send-email-valentin.schneider@xxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/sched/core.c | 5 +---- 1 file changed, 1 insertion(+), 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)
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