linux-kernel - Re: [PATCH 1/2 v2] WARN_ON_SMP(): Allow use in if statements on UP

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Date:	Fri, 18 Mar 2011 10:12:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Darren Hart <dvhart@...ux.intel.com>
Subject: Re: [PATCH 1/2 v2] WARN_ON_SMP(): Allow use in if statements on UP

On Thu, 2011-03-17 at 17:56 -0400, Steven Rostedt wrote:
> + * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
> + * returns 0 for uniprocessor settings. 

Arguably most spin_is_locked() usages should be removed in favour of
something like lockdep_assert_held().

The latter only emits code then built with lockdep enabled and it checks
we are indeed the owner, not some random other cpu.


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