linux: Make uname less weird

[trasz]

Summary

In Linux most of the identifying kernel information belongs in
osrelease, the one reported by "uname -r". Version ("uname -v")
contains mostly the build number and timestamp, and tools like
neofetch(1) don't even bother reporting it.

Before:
Linux pustak 4.4.0 FreeBSD 14.0-CURRENT #1 main-n262054-cc3793b1c548: Sun Apr 9 21 x86_64 x86_64 x86_64 GNU/Linux

After:
Linux pustak 4.4.0-freebsd14.0-current #1 main-n262054-cc3793b1c548: Sun Apr 9 21:06:31 BST 2023 x86_64 x86_64 x86_64 GNU/Linux

[emaste]

Would you mind showing example before/after uname results?

[dchagin]

well, the part after a dash is not standart, depends on a distributive, so we can put here any information, and it would be nice to print p_osrel of the current process here.
However, I would propose completely remove the pr_osrelease from struct linux_prison as we have pr_osrel and due to the pr_osrelease was intended to map into the vdso page at the Note section. But its not possible due to jails and can be removed now.

[trasz]

In D39507#899652, @dchagin wrote:

well, the part after a dash is not standart, depends on a distributive, so we can put here any information, and it would be nice to print p_osrel of the current process here.
However, I would propose completely remove the pr_osrelease from struct linux_prison as we have pr_osrel and due to the pr_osrelease was intended to map into the vdso page at the Note section. But its not possible due to jails and can be removed now.

I think I get what you are saying, but I'm not sure if I understand the code enough to rip it out safely.