lkml.org 
[lkml]   [2018]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v8 24/26] drivers: firmware: psci: Deal with CPU hotplug when using OSI mode
On 19 November 2018 at 20:50, Raju P L S S S N <rplsssn@codeaurora.org> wrote:
> Hi Ulf,
>
> Got one issue in hotplug path where of_genpd_detach_cpu calls
> dev_pm_qos_remove_notifier which can be sleeping as per below call stack. I
> think it should be applicable for current patch as well right? Please let me
> know what am I missing? why didn't you see this issue with this patch?

Weird.

>
>
> [ 8103.221387] BUG: sleeping function called from invalid context at
> /mnt/host/source/src/third_party/kernel/v4.14/kernel/locking/mutex.c:238

Could it be due to some other patch in your v.4.14 kernel?

> [ 8103.221455] in_atomic(): 1, irqs_disabled(): 128, pid: 11, name:
> migration/0
> [ 8103.221487] Preemption disabled at:
> [ 8103.221529] [<ffffff800814dfb0>] cpu_stopper_thread+0x98/0x118
> [ 8103.221600] ------------[ cut here ]------------
> [ 8103.221636] kernel BUG at
> /mnt/host/source/src/third_party/kernel/v4.14/kernel/sched/core.c:6102!
> [ 8103.221678] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
> [ 8103.222396] CPU: 0 PID: 11 Comm: migration/0 Tainted: G W 4.14.72
> #1
> [ 8103.222428] Hardware name: Google Cheza (rev1) (DT)
> [ 8103.222460] task: ffffffc0f842d580 task.stack: ffffff8009c18000
> [ 8103.222504] PC is at ___might_sleep+0x138/0x140
> [ 8103.222542] LR is at ___might_sleep+0x138/0x140
> [ 8103.222577] pc : [<ffffff80080d8f04>] lr : [<ffffff80080d8f04>] pstate:
> 60c001c9
> [ 8103.222605] sp : ffffff8009c1bb40
> ….
> [ 8103.223924] [<ffffff80080d8f04>] ___might_sleep+0x138/0x140
> [ 8103.223965] [<ffffff80080d8d98>] __might_sleep+0x4c/0x80
> [ 8103.224009] [<ffffff80088e4258>] mutex_lock+0x28/0x60
> [ 8103.224054] [<ffffff800850fa2c>] dev_pm_qos_remove_notifier+0x1c/0x54
> [ 8103.224097] [<ffffff8008517814>] genpd_remove_device+0x3c/0x10c
> [ 8103.224140] [<ffffff800851949c>] genpd_dev_pm_detach+0x48/0x108
> [ 8103.224183] [<ffffff80085193e0>] of_genpd_detach_cpu+0x48/0xbc
> [ 8103.224227] [<ffffff80083edea4>] cpu_pd_dying+0x28/0x38
> [ 8103.224268] [<ffffff80080ab2c0>] cpuhp_invoke_callback+0x254/0x5f0
> [ 8103.224308] [<ffffff80080acdec>] take_cpu_down+0x60/0x9c
> [ 8103.224346] [<ffffff800814d898>] multi_cpu_stop+0xac/0x104
> [ 8103.224385] [<ffffff800814dfb8>] cpu_stopper_thread+0xa0/0x118
> [ 8103.224427] [<ffffff80080cff74>] smpboot_thread_fn+0x19c/0x278
> [ 8103.224472] [<ffffff80080cc0c4>] kthread+0x120/0x130
> [ 8103.224513] [<ffffff8008084608>] ret_from_fork+0x10/0x18

Thanks for the report, I will double check my series before I post the
new version of my series. If nothing unexpected shows up, that should
be in a couple of days from now.

I keep you cc.

[...]

Kind regards
Uffe

\
 
 \ /
  Last update: 2018-11-20 10:51    [W:0.163 / U:0.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site