uapi/drm/i915: document field usage of drm_i915_perf_oa_config
Document the expected length of buffers config pointers (tuple of u32 values). Signed-off-by: NLionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20170918114241.30105-1-lionel.g.landwerlin@intel.com
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