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DMA_BUF export needs some of the callbacks to be non-NULL such as map_dma_buf, unmap_dma_buf and release callbacks. Absence of gives gives a Warning and returns a failure. Jira NVGPU-8619 Signed-off-by: Debarshi Dutta <ddutta@nvidia.com> Change-Id: Iea109cbfe06c1b2eb8741c727b52fcfd0ffece8e Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2815108 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Sagar Kamble <skamble@nvidia.com> Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com> Tested-by: Prateek Sethi <prsethi@nvidia.com>