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Date:   Sun, 24 May 2020 13:41:17 +0530
From:   Amol Grover <frextrite@gmail.com>
To:     Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
        James Morris <jamorris@linux.microsoft.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jann Horn <jannh@google.com>,
        David Howells <dhowells@redhat.com>,
        Shakeel Butt <shakeelb@google.com>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Paul Moore <paul@paul-moore.com>,
        Eric Paris <eparis@redhat.com>
Cc:     linux-kernel-mentees@lists.linuxfoundation.org,
        linux-kernel@vger.kernel.org, linux-audit@redhat.com,
        Joel Fernandes <joel@joelfernandes.org>,
        Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>,
        "Paul E . McKenney" <paulmck@kernel.org>
Subject: Re: [PATCH 1/3 RESEND] sched: Remove __rcu annotation from cred
 pointer
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References: <20200402055640.6677-1-frextrite@gmail.com>
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On Thu, Apr 02, 2020 at 11:26:38AM +0530, Amol Grover wrote:
> task_struct::cred (subjective credentials) is *always* used
> task-synchronously, hence, does not require RCU semantics.
> 
> task_struct::real_cred (objective credentials) can be used in
> RCU context and its __rcu annotation is retained.
> 
> However, task_struct::cred and task_struct::real_cred *may*
> point to the same object, hence, the object pointed to by
> task_struct::cred *may* have RCU delayed freeing.
> 
> Suggested-by: Jann Horn <jannh@google.com>
> Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> Signed-off-by: Amol Grover <frextrite@gmail.com>

Hello everyone,

Could you please go through patches 1/3 and 2/3 and if deemed OK, give
your acks. I sent the original patch in beginning of February (~4 months
back) and resent the patches again in beginning of April due to lack of
traffic. Paul Moore was kind enough to ack twice - the 3/3 and its
resend patch. However these 2 patches still remain. I'd really
appreciate if someone reviewed them.

Thanks
Amol