linux-kernel - Re: [PATCH tip/core/rcu 03/17] rcu/tree: Skip entry into the page allocator for PREEMPT

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Message-ID: <20200715141622.zd2h3mnhd7ypd2fp@linutronix.de>
Date:   Wed, 15 Jul 2020 16:16:22 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     paulmck@...nel.org, joel@...lfernandes.org, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com
Subject: Re: [PATCH tip/core/rcu 03/17] rcu/tree: Skip entry into the page
 allocator for PREEMPT_RT

On 2020-07-15 15:38:08 [+0200], Uladzislau Rezki wrote:
> > As of -rc3 it should complain about printk() which is why it is still disabled by default.
> >
> Have you tried to trigger a "complain" you are talking about?

No, but I is wrong because a raw_spinlock_t is acquired followed by a
spinlock_t.

> I suspect to get some trace dump when CONFIG_PROVE_RAW_LOCK_NESTING=y.

You should get one if you haven't received any splat earlier (like from
printk code because it only triggers once).

> Thank you.

Sebastian