malloc "non-sleepablelocks held" messages for nvidia.ko at boot time

I have no apparent problems using the NVIDIA_FreeBSD-1.0-3203 driver,
but under 5.1-BETA I see the following messages, which I assume are
informational only, but I don't really know what it is that they are
trying to "tell me":


Jun  2 01:43:16 <kern.info> freebsd2 syslogd: kernel boot file is /boot/kernel/kernel
malloc() of "32" with the following non-sleepablelocks held:
exclusive sleep mutex dev.mtx_api r = 0 (0xc64a1b88) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711
malloc() of "65536" with the following non-sleepablelocks held:
exclusive sleep mutex dev.mtx_api r = 0 (0xc64a1b88) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711
malloc() of "DP fakepg" with the following non-sleepablelocks held:
exclusive sleep mutex ctl.mtx_api r = 0 (0xc084f4c8) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711
malloc() of "32" with the following non-sleepablelocks held:
exclusive sleep mutex dev.mtx_api r = 0 (0xc64a1b88) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711
malloc() of "4096" with the following non-sleepablelocks held:
exclusive sleep mutex dev.mtx_api r = 0 (0xc64a1b88) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711
malloc() of "32" with the following non-sleepablelocks held:
exclusive sleep mutex dev.mtx_api r = 0 (0xc64a1b88) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711
malloc() of "32768" with the following non-sleepablelocks held:
exclusive sleep mutex dev.mtx_api r = 0 (0xc64a1b88) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711
malloc() of "DP fakepg" with the following non-sleepablelocks held:
exclusive sleep mutex ctl.mtx_api r = 0 (0xc084f4c8) locked _at_ /var/tmp/NVIDIA_FreeBSD-1.0-3203/src/nvidia_subr.c:711