Messages in this thread | | | Date | Tue, 20 Nov 2012 16:19:25 +1000 | Subject | Re: [PATCH 3/4] drm/ttm, drm/vmwgfx: Use RCU locking for object lookups v3 | From | Dave Airlie <> |
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On Tue, Nov 6, 2012 at 9:31 PM, Thomas Hellstrom <thellstrom@vmware.com> wrote: > The mostly used lookup+get put+potential_destroy path of TTM objects > is converted to use RCU locks. This will substantially decrease the amount > of locked bus cycles during normal operation. > Since we use kfree_rcu to free the objects, no rcu synchronization is needed > at module unload time.
As this is the first use of RCU in a drm driver from what I can see, let me remind that the RCU patent agreement AFAIK only covers GPL works.
So non-GPL or other OSes porting this code should take not of this.
Dave.
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