lkml.org 
[lkml]   [2016]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v7 2/2] x86/apic: x2apic write eoi msr notrace
2016-11-03 5:10 GMT+08:00 Borislav Petkov <bp@alien8.de>:
> On Mon, Oct 31, 2016 at 09:37:02AM +0800, Wanpeng Li wrote:
>> From: Wanpeng Li <wanpeng.li@hotmail.com>
>>
>> | RCU used illegally from idle CPU!
>> | rcu_scheduler_active = 1, debug_locks = 0
>> | RCU used illegally from extended quiescent state!
>> | no locks held by swapper/1/0.
>> |
>> | [<ffffffff9d492b95>] do_trace_write_msr+0x135/0x140
>> | [<ffffffff9d06f860>] native_write_msr+0x20/0x30
>> | [<ffffffff9d065fad>] native_apic_msr_eoi_write+0x1d/0x30
>> | [<ffffffff9d05bd1d>] smp_reschedule_interrupt+0x1d/0x30
>> | [<ffffffff9d8daec6>] reschedule_interrupt+0x96/0xa0
>
> Please remove the text between [] and the offsets after "+..." - those
> are useless in a commit message.
>
>> Reschedule interrupt may be called in cpu idle state. This causes lockdep
>
> s/cpu/CPU/
>
>> check warning above.
>>
>> As Peterz pointed out:
>>
>> | So now we're making a very frequent interrupt slower because of debug
>> | code.
>> |
>> | The thing is, many many smp_reschedule_interrupt() invocations don't
>> | actually execute anything much at all and are only send to tickle the
>
> s/send/sent/

I will send a new version to clean it up.

Regards,
Wanpeng Li

\
 
 \ /
  Last update: 2016-11-07 05:36    [W:0.075 / U:5.260 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site