On Thu, May 28, 2020 at 10:38:15AM -0700, Andre McCurdy wrote: > And where does it leave OLDEST_KERNEL (currently set to 3.2.0)? If > even kernel 4.1 is too old to be used with OE master then > OLDEST_KERNEL looks like it should be updated to avoid giving users > with older kernels false hope.
Yes. Ultimately, OLDEST_KERNEL is really a distro decision, but it shouldn't be set to an unnecessarily old version. Glibc in particular uses that variable to decide how much compatibility code it needs to include to support old kernels, and there is sometimes a runtime performance cost associated with that. And as you say, if a user sees OLDEST_KERNEL = "3.2.0" then one couldn't really blame them for assuming that this means they can use such a kernel. I don't personally know any reason why a 3.2 kernel wouldn't work just fine with most of oe-core, and I think that's still the minimum required kernel version for the current version of glibc, but perhaps others know of reasons why newer kernels are nowadays needed. p.
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