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Ever wondered why @torvalds coined the #Linux #kernel's "no regressions" rule? He just explained it again here: https://lore.kernel.org/all/CAHk-=wgtb7y-bEh7tPDvDWru7ZKQ8-KMjZ53Tsk37zsPPdwXbA@mail.gmail.com/
'"[…] I introduced that "no regressions" rule something like two decades ago, because people need to be able to update their kernel without fear of something they relied on suddenly stopping to work. […]"'
Follow the link for context and other statements that did not fit into a toot.
2/ Also note that Linus' message[1] indirectly explains why you might not be able to claim "no regressions" when you only find a problem after updating from one longterm aka LTS #Linux #kernel series to a later one:
By then others might have started relying on the new behaviour, hence fixing the regression might be impossible without causing a regression for those other people – and then you might lose out.
[1] https://lore.kernel.org/all/CAHk-=wgtb7y-bEh7tPDvDWru7ZKQ8-KMjZ53Tsk37zsPPdwXbA@mail.gmail.com/
