linux-kernel - Re: [PATCH 2/5] sched,ptrace: Fix ptrace_check_attach() vs PREEMPT

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Message-ID: <20220413185704.GA30360@redhat.com>
Date:   Wed, 13 Apr 2022 20:57:04 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     rjw@...ysocki.net, mingo@...nel.org, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, mgorman@...e.de,
        ebiederm@...ssion.com, bigeasy@...utronix.de,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        tj@...nel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 2/5] sched,ptrace: Fix ptrace_check_attach() vs PREEMPT_RT

On 04/13, Oleg Nesterov wrote:
>
> I like 1-2 but I need to read them (and other patches) again, a
> couple of nits right now.

Sorry, didn't have time to do this today, and now I am already sleeping.

But... on a second thought, it seems there is a better solution. If nothing
else it is simpler and doesn't duplicate the wait_task_inactive() logic.

How about the patch below instead? On top of 1/5.

Yes,yes, incomplete. in particular see the "!!!!!!!!!" comments. Just to
explain the idea.

Oleg.