Date: Sat, 11 May 2024 07:17:11 +0200 From: Milan Obuch <freebsd-arch@dino.sk> To: freebsd-arch@freebsd.org Subject: Re: Disabling COMPAT_FREEBSD4/5/6/7/9 in default kernel configurations Message-ID: <20240511071711.0c730e63@zeta.dino.sk> In-Reply-To: <NxZrrMD--3-9@tuta.io> References: <NxZrrMD--3-9@tuta.io>
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On Sat, 11 May 2024 01:38:38 +0200 (CEST) henrichhartzer@tuta.io wrote: > Hi everyone, > > Warner suggested that I run this by the list. In 2018, a bug report > was made for disabling COMPAT_FREEBSD4/5/6/7/9 (there's no 8). 6 > years later, I imagine this would be as good of a time as any to do > this if there's no obvious problems doing so. > > Here's the bug report: > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231768 > > And a pull request in the spirit of the original patch: > https://github.com/freebsd/freebsd-src/pull/1228 > > I imagine if this sounds like a good idea, it would land in 15.0. > Users could always recompile kernels with the old ABI functionality > as needed. I feel like we're all a little curious if anything still > uses this, and making this kind of change is probably the best way to > find out. > > In my opinion, if all goes well, it may be wise to remove the old > code in the next major version. Could do the full list, or just > FreeBSD 4 and 5 compatibility, for instance. Barring notable negative > feedback, of course. > > There were some concerns about Rust, but it sounds like it uses (or > used?) FreeBSD 10.X features, which this patch does not remove. On > that topic: https://github.com/rust-lang/rust/issues/89058 > In general I think it is good move. In my kernel builds I am trying to use minimal set of features (options, devices) and use loadable modules whenever possible. I used to remove all COMPAT_FREEBSDn options, now I am keeping 11 and up - in my notes rust is being listed, but I think some jdk (or needed bootstrap) required some compatibility, too. Idea of COMPAT_FREEBSDn being converted into loadable module mentioned in some reply is nice, I don't know much in this area to have anything more competent to say. Regards, Milan
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