On Sun, Sep 26, 2021 at 01:39:33PM +0200, Greg Kroah-Hartman wrote: > On Sun, Sep 26, 2021 at 11:31:20AM +0000, Jari Ruusu wrote: > > On Sunday, September 26th, 2021 at 14:24, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > Why use an older kernel tree on this device? Rasbian seems to be on > > > 4.19.y at the least right now, is there something in those older kernel > > > trees that you need? > > > > Due to circumstances, I need "smallest possible" kernel with all extra > > stripped out. 4.9.y kernels are smaller than newer ones. > > Smaller by how much, and what portion grew? Are we building things into > the kernel that previously was able to be compiled out? Or is there > something new added after 4.9 that adds a huge memory increase? > > Figuring that out would be good as you only have 1 more year for 4.9.y > to be alive, that's not going to last for forever... FWIW a situation I faced a few times was trying to put a modern kernel on a small NAND partition of an older device. Nowadays kernels are really big. I don't have numbers here but for example I never managed to make a 5.10 fit into the 4 MB partition of an old armv5 device where its 3.4 had plenty of room. And there isn't a single thing to disable, it looks more like a systemic growth, probably due to all the stuff we now have to improve large systems performance and harden everything. Willy
