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| author | Maarten Lankhorst <maarten.lankhorst@canonical.com> | 2014-07-01 12:58:00 +0200 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-21 19:12:26 +0900 |
| commit | 038e0e53f40f24ec815cebea9f90a58b141f4e96 (patch) | |
| tree | f15474946c0480e03702073eba877b060d73109e /drivers/iio | |
| parent | 50a6fbd6189080a4913604e1275effbdffc69a30 (diff) | |
| download | linux-3.10-038e0e53f40f24ec815cebea9f90a58b141f4e96.tar.gz linux-3.10-038e0e53f40f24ec815cebea9f90a58b141f4e96.tar.bz2 linux-3.10-038e0e53f40f24ec815cebea9f90a58b141f4e96.zip | |
reservation: add suppport for read-only access using rcu
This adds some extra functions to deal with rcu.
reservation_object_get_fences_rcu() will obtain the list of shared
and exclusive fences without obtaining the ww_mutex.
reservation_object_wait_timeout_rcu() will wait on all fences of the
reservation_object, without obtaining the ww_mutex.
reservation_object_test_signaled_rcu() will test if all fences of the
reservation_object are signaled without using the ww_mutex.
reservation_object_get_excl and reservation_object_get_list require
the reservation object to be held, updating requires
write_seqcount_begin/end. If only the exclusive fence is needed,
rcu_dereference followed by fence_get_rcu can be used, if the shared
fences are needed it's recommended to use the supplied functions.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/iio')
0 files changed, 0 insertions, 0 deletions