linux-kernel - Re: [PATCH] trace/irq: fix WARNING in check_flags while CONFIG_TRACE

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Message-ID: <20160222122651.GG6357@twins.programming.kicks-ass.net>
Date:	Mon, 22 Feb 2016 13:26:51 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wang Yufen <wangyufen@...wei.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	guohanjun@...wei.com, dingtianhong@...wei.com,
	Ma Jun <majun258@...wei.com>
Subject: Re: [PATCH] trace/irq: fix WARNING in check_flags while
 CONFIG_TRACE_IRQFLAGS opened

On Mon, Feb 22, 2016 at 06:06:45PM +0800, Wang Yufen wrote:
> if CONFIG_TRACE_IRQFLAGS opened, we got that warning:
> [  214.078880] ------------[ cut here ]------------
> 
> [  214.083521] WARNING: CPU: 4 PID: 1 at kernel/locking/lockdep.c:3557
> check_flags.part.40+0x1c0/0x1d0()

I'm not entirely sure how to open a CONFIG_ symbol, but when I have it
enabled, I do not get this warning.

So your report is missing some critical information.