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Otherwise we'd wrap around after 32 bits. The kernel currently limits GPU virtual address space to 4GB anyway, but that will probably change sooner or later, and this would result in confusing error messages when running out of virtual address space even now. Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>