[PATCH 0/2] dma-buf/sync_file: rework fences on struct sync_file

[Gustavo Padovan]

From: Gustavo Padovan <gustavo.padovan at collabora.co.uk>

Hi all, 
  
This is an attempt to improve fence support on Sync File. The basic idea  
is to have only sync_file->fence and store all fences there, either as 
normal fences or fence_arrays. That way we can remove some potential
duplication when using fence_array with sync_file: the duplication of the array 
of fences and the duplication of fence_add_callback() for all fences.  
  
Now when creating a new sync_file during the merge process sync_file_set_fence()
will set sync_file->fence based on the number of fences for that sync_file. If  
there is more than one fence a fence_array is created. One important advantage  
approach is that we only add one fence callback now, no matter how many fences  
there are in a sync_file - the individual callbacks are added by fence_array.
  
Please review! Thanks! 
  
  Gustavo  

Changes since RFC v2 (Comments from Chris Wilson and Christian König):  
 - struct sync_file lost status member in favor of fence_is_signaled()
 - drop use of fence_array_teardown()
 - use sizeof(*fence) to allocate only an array on fence pointers

Changes since RFC v1 (Comments from Chris Wilson and Christian König):  
 - Not using fence_ops anymore.
 - fence_is_array() was created to differentiate fence from fence_array  
 - fence_array_teardown() is now exported and used under fence_is_array()
 - struct sync_file lost num_fences member 

Gustavo Padovan (2):
  dma-buf/fence-array: add fence_is_array()
  dma-buf/sync_file: rework fence storage in struct file

 drivers/dma-buf/sync_file.c          | 163 ++++++++++++++++++++++-------------
 drivers/staging/android/sync_debug.c |  13 ++-
 include/linux/fence-array.h          |  10 +++
 include/linux/sync_file.h            |  17 ++--
 4 files changed, 128 insertions(+), 75 deletions(-)

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2.5.5