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To enable userspace query about comptags allocation status of a buffer, comptags are to be allocated only during buffer registration done by nvrm_gpu. Earlier, they were allocated during map. nvrm_gpu will be sending metadata blob to be associated with the buffer. This will have to be stored in the dmabuf privdata for all the buffers registered by nvrm_gpu. This patch moves the privdata allocation to buffer registration ioctl. Remove g->mm.priv_lock as it is not needed now. This lock was added to protect dmabuf private data setup. That private data is now handled through dmabuf->ops and setup of dmabuf->ops is done under dmabuf->lock. To support legacy userspace, this patch still allocates comptags on demand on map calls for unregistered buffers. Bug 200586313 Change-Id: I88b2ca04c733dd02a84bcbf05060bddc00147790 Signed-off-by: Sagar Kamble <skamble@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2480761 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>