When did the (mainland) Linux kernel introduce or give up support for* …


Version    (est) date    in/out   what/comment
1.2.0      1995-03       in       Alpha, MIPS, SPARC added
1.3.0      1995-06       in       SMP supported
2.2.0      1999-01       in       PA-RISC, UltraSPARC, IPv6 added
2.4.0      2001-01       in       USB, iptables supported
2.6.20     2007-02       in       KVM added
2.6.27     2008-10       in       SAS disks supported 
2.6.29     2009-03       in       btrfs added
2.6.31     2009-09       in       4k sectors supported
2.6.37     2011-01       in       USB 3.0 supported
3.5.7      2012-07       out      Econet, Token Ring removed
3.8.13     2013-02       out      Intel i80386 support removed
5.4        2019-11       in       ExFAT fs supported
5.6        2020-03       in       WireGuard supported
6.16       2025-08       fix      Macintosh II support fixed

*this is list is subjective to the usage here at 3rz. It’s definitely
not exhaustive and leaves out e.g. all the modern GPU information, and
a lot of other stuff, too.