Re: cmpxchg is not available to generic code

[Dave Airlie]

> 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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