From 6c1e963cc5771c93d4ed7aa8bdd4322a7c918e9b Mon Sep 17 00:00:00 2001 From: Thomas Hellstrom Date: Tue, 6 Nov 2012 11:31:51 +0000 Subject: [PATCH] drm/ttm: Optimize reservation slightly Reservation locking currently always takes place under the LRU spinlock. Hence, strictly there is no need for an atomic_cmpxchg call; we can use atomic_read followed by atomic_write since nobody else will ever reserve without the lru spinlock held. At least on Intel this should remove a locked bus cycle on successful reserve. Note that thit commit may be obsoleted by the cross-device reservation work. Signed-off-by: Thomas Hellstrom Signed-off-by: Dave Airlie --- Reading git-format-patch failed