linux-kernel - Re: __update_max_tr: rcu_read_lock() used illegally while idle!

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Message-ID: <1343746583.27983.55.camel@gandalf.stny.rr.com>
Date:	Tue, 31 Jul 2012 10:56:23 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Steven Rostedt <srostedt@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: __update_max_tr: rcu_read_lock() used illegally while idle!

On Tue, 2012-07-31 at 10:51 -0400, Steven Rostedt wrote:

> > OK, I will bite.  How about using something like RCU_NONIDLE(), either
> > directly or open-coded, to make it a legal call site?
> 
> OK, then something like:
> 
> 	RCU_NONIDLE(max_data = task_uid(tsk));
> 
> would work when called normally or with idle?
> 

The comment above RCU_NONIDLE() says:

	This macro may be used from process-level code only.

Although I'm not sure what a 'level' is. Do you mean process-context? If
so, then this will not work because it can be called from non process
level code (return from interrupt), or any interrupt that enables
interrupts.

-- Steve


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