Re: WARNING: events/ipi.h:36 suspicious rcu_dereference_check() usage!

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Subject: Re: WARNING: events/ipi.h:36 suspicious rcu_dereference_check() usage!
From: Steven Rostedt <rostedt@xxxxxxxxxxx>
Date: Fri, 17 Apr 2020 09:50:28 -0400
Cc: Masami Hiramatsu <masami.hiramatsu@xxxxxxxxxx>, Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>, linux- stable <stable@xxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Sasha Levin <sashal@xxxxxxxxxx>, rcu@xxxxxxxxxxxxxxx, lkft-triage@xxxxxxxxxxxxxxxx, Anders Roxell <anders.roxell@xxxxxxxxxx>, zanussi@xxxxxxxxxx, svens@xxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>
In-reply-to: <20200417071543.GA7316@leoy-ThinkPad-X240s>

On Fri, 17 Apr 2020 15:15:43 +0800
Leo Yan <leo.yan@xxxxxxxxxx> wrote:

> Good analysis, Masami :)

Agreed. Nice work Masami!

> 
> Seems to me, Arm64 should study Arm platform to change using
> trace_ipi_raise_rcuidle() to work around the restriction so can allow the
> event to work in idle context?

Also agree. Looks to need the rcuidle() variant.

-- Steve

References:
- WARNING: events/ipi.h:36 suspicious rcu_dereference_check() usage!
  - From: Naresh Kamboju
- Re: WARNING: events/ipi.h:36 suspicious rcu_dereference_check() usage!
  - From: Masami Hiramatsu
- Re: WARNING: events/ipi.h:36 suspicious rcu_dereference_check() usage!
  - From: Leo Yan

Prev by Date: Re: [PATCH v3 1/9] xen/events: avoid removing an event channel while handling it
Next by Date: Re: [PATCH 5.6 000/254] 5.6.5-rc1 review
Previous by thread: Re: WARNING: events/ipi.h:36 suspicious rcu_dereference_check() usage!
Next by thread: stable/linux-5.4.y build: 200 builds: 1 failed, 199 passed, 1 error, 107 warnings (v5.4.31)
Index(es):
- Date
- Thread

[Index of Archives] [Linux Kernel] [Kernel Development Newbies] [Linux USB Devel] [Video for Linux] [Linux Audio Users] [Yosemite Hiking] [Linux Kernel] [Linux SCSI]