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From: Tejun Heo <tj@kernel.org>
To: Zhang Qiao <zhangqiao22@huawei.com>
Cc: linux-kernel@vger.kernel.org, juri.lelli@redhat.com,
	mingo@redhat.com, peterz@infradead.org,
	vincent.guittot@linaro.org
Subject: Re: [PATCH] kernel/sched: Fix sched_fork() access an invalid sched_task_group
Date: Wed, 8 Sep 2021 06:29:38 -1000	[thread overview]
Message-ID: <YTjk8oiFa5EfDPn9@slm.duckdns.org> (raw)
In-Reply-To: <be0bdf5a-479c-51bb-6d51-42739c11710d@huawei.com>

Hello,

On Wed, Sep 08, 2021 at 07:32:06PM +0800, Zhang Qiao wrote:
> I will update this patch by following the steps below:
> 1)rename cgroup_subsys->fork() to cgroup_subsys->post_fork();
> 2)add cgroup_subsys->fork() and the cpu_cgroup_fork() callback like this:
> 
> void cpu_cgroup_fork(struct task_struct *task) {
> ....
> 	p->sched_task_group = task_group(current);
> 	__set_task_cpu(p, smp_processor_id());
> 	if (p->sched_class->task_fork)
> 		p->sched_class->task_fork(p);
> ....
> 
> 
> 3)call cgroup_subsys->fork() after cgroup_can_fork().
> 
> Do you have any suggestion?

I'm not following why it needs to shuffle the callbacks. Can't you just
relocate the fectching of task_group after can_fork?

Thanks.

-- 
tejun

  reply	other threads:[~2021-09-08 16:29 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26 11:26 Zhang Qiao
2021-08-30 11:49 ` Zhang Qiao
2021-08-30 14:39 ` Peter Zijlstra
2021-08-30 17:32   ` Tejun Heo
2021-08-31  7:58     ` Zhang Qiao
2021-08-31 22:59       ` Tejun Heo
2021-09-01  7:43         ` Zhang Qiao
2021-09-01 16:45           ` Tejun Heo
2021-09-02  7:42             ` Zhang Qiao
2021-09-07 17:01               ` Tejun Heo
2021-09-08 11:32                 ` Zhang Qiao
2021-09-08 16:29                   ` Tejun Heo [this message]
2021-09-09  9:45                     ` Zhang Qiao

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