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
Date: Sun, 24 May 2020 13:41:17 +0530 [thread overview]
Message-ID: <20200524081117.GA29@workstation-LAP.localdomain> (raw)
In-Reply-To: <20200402055640.6677-1-frextrite@gmail.com>
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
next prev parent reply other threads:[~2020-05-24 8:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 5:56 [PATCH 1/3 RESEND] sched: Remove __rcu annotation from cred pointer Amol Grover
2020-04-02 5:56 ` [PATCH 2/3 RESEND] cred: Do not use RCU primitives to access " Amol Grover
2020-04-02 5:56 ` [PATCH 3/3 RESEND] auditsc: Do not use RCU primitive to read from " Amol Grover
2020-04-02 12:56 ` Paul Moore
2020-04-03 7:56 ` Amol Grover
2020-04-03 19:25 ` Paul Moore
2020-04-03 21:21 ` Richard Guy Briggs
2020-04-03 21:43 ` Paul Moore
2020-04-04 2:53 ` Richard Guy Briggs
2020-05-24 8:11 ` Amol Grover [this message]
2020-05-25 13:17 ` [PATCH 1/3 RESEND] sched: Remove __rcu annotation " Richard Guy Briggs
2020-05-25 18:04 ` Amol Grover
2020-05-26 12:34 ` Paul Moore
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