drm/ttm: Optimize reservation slightly

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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 <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

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Thomas Hellstrom 2012-11-06 11:31:51 +00:00 • committed by Dave Airlie

parent cdad05216c

commit 6c1e963cc5

1 changed files with 2 additions and 1 deletions

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drivers/gpu/drm/ttm/ttm_bo.c

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