From: John Jacques <>

The original patch is as follows.  The same problem can be
observed on arch/arm64 targets.

ARM: smp: Move clear_tasks_mm_cpumask() call to __cpu_die()

When running with the RT-kernel (4.1.5-rt5) on TI OMAP dra7-evm and trying
to do Suspend to RAM, the following backtrace occurs:

 Disabling non-boot CPUs ...
 PM: noirq suspend of devices complete after 7.295 msecs
 Disabling non-boot CPUs ...
 BUG: sleeping function called from invalid context at 
 in_atomic(): 1, irqs_disabled(): 128, pid: 18, name: migration/1
 INFO: lockdep is turned off.
 irq event stamp: 122
 hardirqs last  enabled at (121): [<c06ac0ac>] 
 hardirqs last disabled at (122): [<c06abed0>] _raw_spin_lock_irq+0x28/0x5c
 softirqs last  enabled at (0): [<c003d294>] copy_process.part.52+0x410/0x19d8
 softirqs last disabled at (0): [<  (null)>]   (null)
 Preemption disabled at:[<  (null)>]   (null)
  CPU: 1 PID: 18 Comm: migration/1 Tainted: G        W       
4.1.4-rt3-01046-g96ac8da #204
 Hardware name: Generic DRA74X (Flattened Device Tree)
 [<c0019134>] (unwind_backtrace) from [<c0014774>] (show_stack+0x20/0x24)
 [<c0014774>] (show_stack) from [<c06a70f4>] (dump_stack+0x88/0xdc)
 [<c06a70f4>] (dump_stack) from [<c006cab8>] (___might_sleep+0x198/0x2a8)
 [<c006cab8>] (___might_sleep) from [<c06ac4dc>] (rt_spin_lock+0x30/0x70)
 [<c06ac4dc>] (rt_spin_lock) from [<c013f790>] (find_lock_task_mm+0x9c/0x174)
 [<c013f790>] (find_lock_task_mm) from [<c00409ac>] 
 [<c00409ac>] (clear_tasks_mm_cpumask) from [<c00166a4>] 
 [<c00166a4>] (__cpu_disable) from [<c06a2e8c>] (take_cpu_down+0x1c/0x50)
 [<c06a2e8c>] (take_cpu_down) from [<c00f2600>] (multi_cpu_stop+0x11c/0x158)
 [<c00f2600>] (multi_cpu_stop) from [<c00f2a9c>] (cpu_stopper_thread+0xc4/0x184)
 [<c00f2a9c>] (cpu_stopper_thread) from [<c0069058>] 
 [<c0069058>] (smpboot_thread_fn) from [<c00649c4>] (kthread+0xe8/0x104)
 [<c00649c4>] (kthread) from [<c0010058>] (ret_from_fork+0x14/0x3c)
 CPU1: shutdown
 PM: Calling sched_clock_suspend+0x0/0x40
 PM: Calling timekeeping_suspend+0x0/0x2e0
 PM: Calling irq_gc_suspend+0x0/0x68
 PM: Calling fw_suspend+0x0/0x2c
 PM: Calling cpu_pm_suspend+0x0/0x28

Also, sometimes system stucks right after displaying "Disabling non-boot
CPUs ...". The root cause of above backtrace is task_lock() which takes
a sleeping lock on -RT.

To fix the issue, move clear_tasks_mm_cpumask() call from __cpu_disable()
to __cpu_die() which is called on the thread which is asking for a target
CPU to be shutdown. In addition, this change restores CPUhotplug functionality
on TI OMAP dra7-evm and CPU1 can be unplugged/plugged many times.

Signed-off-by: Grygorii Strashko <>
Cc: Steven Rostedt <>
Cc: <>
Cc: Sekhar Nori <>
Cc: Austin Schuh <>
Cc: <>
Cc: Russell King <>
Cc: <>
Signed-off-by: Thomas Gleixner <>
Signed-off-by: John Jacques <>
 arch/arm64/kernel/smp.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index edf73a6..38b47ea 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -231,11 +231,6 @@ int __cpu_disable(void)
-       /*
-        * Remove this CPU from the vm mask set of all processes.
-        */
-       clear_tasks_mm_cpumask(cpu);
        return 0;
@@ -264,6 +259,12 @@ void __cpu_die(unsigned int cpu)
                pr_crit("CPU%u: cpu didn't die\n", cpu);
+       /*
+        * Remove this CPU from the vm mask set of all processes.
+        */
+       clear_tasks_mm_cpumask(cpu);
        pr_notice("CPU%u: shutdown\n", cpu);

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