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Under the assumption that enabling signaling will be a frequent operation, lets preallocate our attachments for signaling inside the (rather large) request struct (and so benefiting from the slab cache). v2: Convert from void * to more meaningful names and types. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1467390209-3576-17-git-send-email-chris@chris-wilson.co.uk