linux-kernel - Re: [PATCH] drm: Do not use BUG_ON(!spin_is

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Message-ID: <53E8CDF8.2060008@roeck-us.net>
Date:	Mon, 11 Aug 2014 07:06:48 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	David Rientjes <rientjes@...gle.com>
CC:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: Do not use BUG_ON(!spin_is_locked())

On 08/11/2014 04:45 AM, David Rientjes wrote:
> On Sun, 10 Aug 2014, Guenter Roeck wrote:
>
>> spin_is_locked() always returns false in uniprocessor configurations
>> and can therefore not be used with BUG_ON. Replace it with
>> assert_spin_locked(), which exists for that very purpose.
>>
>
> It may be helpful to assess whether any of these sites should be converted
> to lockdep_assert_held() so they have no cost when lockdep isn't enabled
> but still reveal problems when debugging.
>
>

Possibly, but that would need to be done by someone with better knowledge
about locking and the code than me.

Guenter

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