linux-kernel - cmpxchg is not available to generic code

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Message-Id: <20070719000549.1e57b5b2.akpm@linux-foundation.org>
Date:	Thu, 19 Jul 2007 00:05:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Airlie <airlied@...ux.ie>
Cc:	linux-kernel@...r.kernel.org
Subject: cmpxchg is not available to generic code

arm:

drivers/char/drm/drm_lock.c: In function `drm_lock_take':
drivers/char/drm/drm_lock.c:221: error: implicit declaration of function `cmpxchg'

You might be able to use atomic_cmpxchg, which _is_ present
on all architectures.  Or use a spinlock.

What's that code doing anyway?  driver-private locking primitives?
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