"grsecurity/PaX" didn't show up in the main tree but is alive in a different branch or as patch. Various distributions and users are free to enable and use i

"grsecurity/PaX" didn't show up in the main tree but is alive in a different branch or as patch. Various distributions and users are free to enable and use it upon demand. It kind of prove Linux kernel is not mono-culture and natural selection and evolution are happening. I believe the AOSP's kernel patches are also not mainlined - also proof Linux kernel are evolving very healthily.