linux-kernel - Re: [PATCH -tip 0/2] Temporary RCU fixes for notrace and hotplug CPU

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Message-ID: <20090825161208.GE6616@linux.vnet.ibm.com>
Date:	Tue, 25 Aug 2009 09:12:08 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>, linux-kernel@...r.kernel.org,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josht@...ux.vnet.ibm.com,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH -tip 0/2] Temporary RCU fixes for notrace and hotplug CPU

On Tue, Aug 25, 2009 at 10:00:47AM +0200, Ingo Molnar wrote:
> 
> btw., i'm still seeing crashes with the latest RCU bits:
> 
> [   20.621740] Testing event sys_enter_futex: OK
> [   20.629738] Testing event sys_exit_futex: OK
> [   20.637737] Testing event lock_acquire: [reboot]
> 
> Possibly due to infinite recursion as well. Config attached.

Color me confused...

Unless someone has a better idea, I will send in a patch that adds
"notrace" to every RCU API member used by any file in the kernel
that has "trace" in its name (excluding ptrace.c and rcutree_trace.c,
of course).  This list is as follows:

	call_rcu()
	call_rcu_sched()
	rcu_read_lock()
	rcu_read_unlock()

So, any better ideas?

							Thanx, Paul
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