Re: [PATCH] drm: Do not use BUG_ON(!spin_is_locked())

From: David Rientjes
Date: Mon Aug 11 2014 - 07:45:22 EST

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.
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