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[94.245.46.49]) by smtp.gmail.com with ESMTPSA id q13sm524522lfb.55.2020.07.15.07.20.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jul 2020 07:20:11 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Wed, 15 Jul 2020 16:20:09 +0200 To: Sebastian Andrzej Siewior Cc: Uladzislau Rezki , paulmck@kernel.org, joel@joelfernandes.org, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com Subject: Re: [PATCH tip/core/rcu 03/17] rcu/tree: Skip entry into the page allocator for PREEMPT_RT Message-ID: <20200715142009.GA25196@pc636> References: <20200624201200.GA28901@paulmck-ThinkPad-P72> <20200624201226.21197-3-paulmck@kernel.org> <20200630164543.4mdcf6zb4zfclhln@linutronix.de> <20200715133808.GA24778@pc636> <20200715141622.zd2h3mnhd7ypd2fp@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200715141622.zd2h3mnhd7ypd2fp@linutronix.de> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org On Wed, Jul 15, 2020 at 04:16:22PM +0200, Sebastian Andrzej Siewior wrote: > 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. > Right. According to documentation CONFIG_PROVE_RAW_LOCK_NESTING is used to detect raw_spinlock vs. spinlock nesting usage. > > > 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). > Got it. Thanks! -- Vlad Rezki