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author | Yong Zhang <yong.zhang0@gmail.com> | 2011-10-16 10:56:44 (GMT) |
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committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:19:15 (GMT) |
commit | deeeefcd45210cc90d6b8640019c6ebe8c4d3830 (patch) | |
tree | 4d6d700bcd0df06116a24bdfce97df2a4c381ea4 /kernel/cpu.c | |
parent | 7694f6caf8071e443eb1d4f9a9cf12c6b75f00e6 (diff) | |
download | linux-fsl-qoriq-deeeefcd45210cc90d6b8640019c6ebe8c4d3830.tar.xz |
hotplug: Call cpu_unplug_begin() before DOWN_PREPARE
cpu_unplug_begin() should be called before CPU_DOWN_PREPARE, because
at CPU_DOWN_PREPARE cpu_active is cleared and sched_domain is
rebuilt. Otherwise the 'sync_unplug' thread will be running on the cpu
on which it's created and not bound on the cpu which is about to go
down.
I found that by an incorrect warning on smp_processor_id() called by
sync_unplug/1, and trace shows below:
(echo 1 > /sys/device/system/cpu/cpu1/online)
bash-1664 [000] 83.136620: _cpu_down: Bind sync_unplug to cpu 1
bash-1664 [000] 83.136623: sched_wait_task: comm=sync_unplug/1 pid=1724 prio=120
bash-1664 [000] 83.136624: _cpu_down: Wake sync_unplug
bash-1664 [000] 83.136629: sched_wakeup: comm=sync_unplug/1 pid=1724 prio=120 success=1 target_cpu=000
Wants to be folded back....
Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Link: http://lkml.kernel.org/r/1318762607-2261-3-git-send-email-yong.zhang0@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r-- | kernel/cpu.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index ef0e472..7e79306 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -408,22 +408,20 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) return -EBUSY; } - err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls); + cpu_hotplug_begin(); + err = cpu_unplug_begin(cpu); if (err) { - nr_calls--; - __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); - printk("%s: attempt to take down CPU %u failed\n", - __func__, cpu); + printk("cpu_unplug_begin(%d) failed\n", cpu); goto out_cancel; } - cpu_hotplug_begin(); - err = cpu_unplug_begin(cpu); + err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls); if (err) { nr_calls--; __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); - printk("cpu_unplug_begin(%d) failed\n", cpu); - goto out_cancel; + printk("%s: attempt to take down CPU %u failed\n", + __func__, cpu); + goto out_release; } smpboot_park_threads(cpu); |