linux-kernel - Re: cmpxchg is not available to generic code

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Message-ID: <Pine.LNX.4.64.0707190900320.19586@skynet.skynet.ie>
Date:	Thu, 19 Jul 2007 09:02:03 +0100 (IST)
From:	Dave Airlie <airlied@...ux.ie>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org
Subject: Re: 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?

When did arm suddenly start wanting DRM? they need to grow a userpsace 
cmpxchg as davem mentioned to go along with this, changing the drm now 
isn't possible due to backwards compat..

Dave.

-- 
David Airlie, Software Engineer
http://www.skynet.ie/~airlied / airlied at skynet.ie
Linux kernel - DRI, VAX / pam_smb / ILUG

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