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Among others describe the > first rule of Linux kernel development and what it means in practice. > Also explain what a regression actually is and how to report one > properly. The text additionally provides a brief introduction to the bot > the kernel's regression tracker uses to facilitate his work. To sum > things up, provide a few quotes from Linus to show how serious he takes > regressions. > > Signed-off-by: Thorsten Leemhuis > --- > Documentation/admin-guide/index.rst | 1 + > Documentation/admin-guide/regressions.rst | 886 ++++++++++++++++++++++ > MAINTAINERS | 1 + > 3 files changed, 888 insertions(+) > create mode 100644 Documentation/admin-guide/regressions.rst > > diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst > index 1bedab498104..17157ee5a416 100644 > --- a/Documentation/admin-guide/index.rst > +++ b/Documentation/admin-guide/index.rst > @@ -36,6 +36,7 @@ problems and bugs in particular. > > reporting-issues > security-bugs > + regressions > bug-hunting > bug-bisect > tainted-kernels > diff --git a/Documentation/admin-guide/regressions.rst b/Documentation/admin-guide/regressions.rst > new file mode 100644 > index 000000000000..6eb8d9784a1f > --- /dev/null > +++ b/Documentation/admin-guide/regressions.rst > @@ -0,0 +1,886 @@ > +.. SPDX-License-Identifier: (GPL-2.0+ OR CC-BY-4.0) > +.. > + If you want to distribute this text under CC-BY-4.0 only, please use 'The > + Linux kernel developers' for author attribution and link this as source: > + https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/Documentation/admin-guide/regressions.rst > +.. > + Note: Only the content of this RST file as found in the Linux kernel sources > + is available under CC-BY-4.0, as versions of this text that were processed > + (for example by the kernel's build system) might contain content taken from > + files which use a more restrictive license. > + > + > +Regressions > ++++++++++++ > + > +The first rule of Linux kernel development: '*We don't cause regressions*'. > +Linux founder and lead developer Linus Torvalds strictly enforces the rule > +himself. This document describes what this means in practice and how the Linux > +kernel's development model ensures all reported regressions are addressed; it > +covers aspects relevant for both users and developers. > + > +The important bits for people affected by regressions > +===================================================== > + > +It's a regression if something running fine with one Linux kernel works worse or > +not at all with a newer version. Note, the newer kernel has to be compiled using > +a similar configuration -- for this and other fine print, check out below > +section "What is a 'regression' and what is the 'no regressions rule'?". > + > +Report your regression as outlined in > +`Documentation/admin-guide/reporting-issues.rst`, it already covers all aspects > +important for regressions. Below section "How do I report a regression?" > +highlights them for convenience. > + > +The most important aspect: CC or forward the report to `the regression mailing > +list `_ (regressions@lists.linux.dev). > +When doing so, consider mentioning the version range where the regression > +started using a paragraph like this:: > + > + #regzbot introduced v5.13..v5.14-rc1 > + > +The Linux kernel regression tracking bot 'regzbot' will then add the report to > +the list of tracked regressions. This is in your interest, as it brings the > +report on the radar of people ensuring all regressions are acted upon in a > +timely manner. > + > +The important bits for people fixing regressions > +================================================ > + > +When receiving regression reports by mail, check if the reporter CCed `the > +regression mailing list `_ > +(regressions@lists.linux.dev). If not, forward or bounce the report to the Linux > +kernel's regression tracker (regressions@leemhuis.info), unless you plan on I would have expected it to be the same mailing list (regressions@lists.linux.dev), is this a typo maybe? Regards, Matthias