linux-kernel - [V3 0/3] Fixed dump_backtrace() when task running on another cpu

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Date:   Tue, 14 Apr 2020 20:36:29 +0800
From:   Wang Qing <wangqing@...o.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        James Morse <james.morse@....com>,
        Mark Rutland <mark.rutland@....com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        jinho lim <jordan.lim@...sung.com>,
        Wang Qing <wangqing@...o.com>,
        Dave Martin <Dave.Martin@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: [V3 0/3] Fixed dump_backtrace() when task running on another cpu 

We cannot get FP and PC when the task is running on another CPU,
task->thread.cpu_context is the last time the task was switched out,
it's better to give a reminder than to provide wrong information
for example when Task blocked in spinlock/interrupt/busy loop.

The task_running() should be renamed to task_running_on_rq()
like the naming of task_running_on_cpu(), this is what it
originally mean.

Add task_running() no rq required.

V2:
- Add task_running_oncpu()
v3:
- Renamed task_running() to task_running_on_rq()
- Renamed task_running_oncpu() to task_running()

Wang Qing (3):
  ARM64:fixed dump_backtrace() when task running on another cpu
  sched:add task_running()
  sched:rename task_running() and to task_running_on_rq

 arch/arm64/kernel/traps.c |  7 +++++++
 include/linux/sched.h     | 10 ++++++++++
 kernel/sched/core.c       | 14 +++++++-------
 kernel/sched/deadline.c   |  6 +++---
 kernel/sched/fair.c       |  2 +-
 kernel/sched/rt.c         |  6 +++---
 kernel/sched/sched.h      |  2 +-
 7 files changed, 32 insertions(+), 15 deletions(-)

-- 
2.7.4