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CERT-C Rule INT32 requires checking that signed values do not wrap when doing arithmetic operations. The INT32 violations in page_allocator were actually unsigned values, so change them to u32 and use safe ops. JIRA NVGPU-3586 Change-Id: I7c7fbf52c2f55a9d47d86c2b01be0ab222d3d65e Signed-off-by: Philip Elcan <pelcan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/2131160 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> Reviewed-by: Alex Waterman <alexw@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Nitin Kumbhar <nkumbhar@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>