Bump version of emulated Linux kernel to 2.6.18 in FreeBSD 9

[rene]

Summary

The Linux emulation in FreeBSD 9 (9.3, 9-STABLE) currently reports kernel version 2.6.16, which is too low for the emulators/linux-c6* ports. These ports require kernel version 2.6.18 or later. Change the Linux emulator to report kernel version 2.6.18 instead (sysctl compat.linux.osrelease). This in turn allows us to run the linux-c6-* ports by default on FreeBSD 9 and to remove the Linux Fedora 10 ports which are long past their EOL.

This is a direct patch to stable/9 , as FreeBSD 10 and HEAD emulate Linux kernel 2.6.32 by default.

Test Plan

1. Build modified Linux emulator for amd64 and i386 (done)
2. Load modified linux.ko into a VM running FreeBSD 9.3-i386 and run some Linux programs with the linux-c6-* ports (todo, but already tested OK with manually bumping compat.linux.osrelease)

[rene]

I tested the patch in a 9.3-i386 VM, the screenshot is available at https://rene-ladan.nl/linux-c6-opera-on-freebsd93.png

[jbeich]

This is a direct patch to stable/9 , as FreeBSD 10 and HEAD emulate Linux kernel 2.6.32 by default.

Before 2.6.32 there was 2.6.18 bump: rS271982 + rS271990 = rS275807 in /stable/10.

[rene]

In D5418#115923, @jbeich wrote:

This is a direct patch to stable/9 , as FreeBSD 10 and HEAD emulate Linux kernel 2.6.32 by default.

Before 2.6.32 there was 2.6.18 bump: rS271982 + rS271990 = rS275807 in /stable/10.

I didn't notice this before, I will MFC the two commits to stable/9

[rene]

Properly MFC earlier commits as suggested by jbeich.

The revision number/date in UPDATING needs to be updated once this is committed? As the idea is to remove the -f10 ports, a message about this should be added to UPDATING in a follow-up commit.

[rene]

Mergeinfo added but this does not show up in Phabricator?

As suggested by des, bump __FreeBSD_version in sys/sys/param.h