36 lines
1.0 KiB
Diff
36 lines
1.0 KiB
Diff
From: Ingo Molnar <mingo@elte.hu>
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Date: Fri, 3 Jul 2009 08:30:27 -0500
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Subject: stop_machine: convert stop_machine_run() to PREEMPT_RT
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.9/older/patches-4.9-rt1.tar.xz
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Instead of playing with non-preemption, introduce explicit
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startup serialization. This is more robust and cleaner as
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well.
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Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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[bigeasy: XXX: stopper_lock -> stop_cpus_lock]
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---
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kernel/stop_machine.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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--- a/kernel/stop_machine.c
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+++ b/kernel/stop_machine.c
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@@ -475,6 +475,16 @@ static void cpu_stopper_thread(unsigned
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struct cpu_stop_done *done = work->done;
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int ret;
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+ /*
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+ * Wait until the stopper finished scheduling on all
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+ * cpus
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+ */
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+ lg_global_lock(&stop_cpus_lock);
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+ /*
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+ * Let other cpu threads continue as well
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+ */
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+ lg_global_unlock(&stop_cpus_lock);
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+
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/* cpu stop callbacks must not sleep, make in_atomic() == T */
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preempt_count_inc();
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ret = fn(arg);
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