On Fri, Oct 25, 2019 at 04:28:26PM +0200, Takashi Iwai wrote: > Jaroslav Kysela wrote: > > Dne 25. 10. 19 v 16:06 Takashi Iwai napsal(a): > > > Well, that's obviously against our dont-breaking-user-space rule. > > > The UCM profiles have been widely used on Chromebooks, and they can't > > > upgrade easily. > > > So, I believe this is a case where we have to live with messes. > > If we speak about Google's kernels, they can apply a revert (depends > > on their upgrade/maintenance policy). If users use the standard Linux > > distributions, then we are fine, don't we? > No, we can't break the already existing user-space. That's what Linus > suggested repeatedly over years, too. I agree. There's some systems where we can get away with incompatible changes as realistically the users are doing full system upgrades and don't care but the Chromebooks definitely aren't one of them, we've had issues reported with breakages on them due to changes with the x86 DSP firmwares. It's mainly people sideloading a regular Linux userspace along with the ChromeOS kernel AIUI.
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