VERY interesting reading for those who are looking for facts and figures about the Linux kernel development. This report covers about 14 months of work, mostly corresponding to kernel version 4.8 through 4.13.
"2017 Linux Kernel Development Report"
https://www.linuxfoundation.org/2017-linux-kernel-report-landing-page/
Pay special attention to "Who is reviewing the work" p20. More than 20% of the Kernel patches are reviewed by people working for Red Hat. Good or bad thing? I let that up to your interpretation. https://mastodon.social/media/Lf7sTosVRabSdwyTie4