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As spinlock contention will eat cpu cycle, the pramin lock can be changed to mutex. Vidmem allocation is fully protected and vidmem pending is an atomic variable. So the lock acquisition is removed. JIRA NVGPU-4550 Change-Id: I0cecb8f4ee7e840fd698311572aedebbc8f49177 Signed-off-by: Dinesh <dt@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2321251 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: automaticguardword <automaticguardword@nvidia.com> Reviewed-by: Ankur Kishore <ankkishore@nvidia.com> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit