ppc64le vmlinuz is huge when building with BTF

Dominique Martinet asmadeus at codewreck.org
Fri Jun 16 22:00:06 AEST 2023

Naveen N Rao wrote on Fri, Jun 16, 2023 at 04:28:53PM +0530:
> > We're not stripping anything in vmlinuz for other archs -- the linker
> > script already should be including only the bare minimum to decompress
> > itself (+compressed useful bits), so I guess it's a Kbuild issue for the
> > arch.
> For a related discussion, see:
> http://lore.kernel.org/CAK18DXZKs2PNmLndeGYqkPxmrrBR=6ca3bhyYCj=GhyA7dHfAQ@mail.gmail.com

Thanks, I didn't know that ppc64le boots straight into vmlinux, as 'make
install' somehow installs something called 'vmlinuz-lts' (-lts coming
out of localversion afaiu, but vmlinuz would come from the build
scripts) ; this is somewhat confusing as vmlinuz on other archs is a
compressed/pre-processed binary so I'd expect it to at least be

> > We can add a strip but I unfortunately have no way of testing ppc build,
> > I'll ask around the build linux-kbuild and linuxppc-dev lists if that's
> > expected; it shouldn't be that bad now that's figured out.
> Stripping vmlinux would indeed be the way to go. As mentioned in the above
> link, fedora also packages a strip'ed vmlinux for ppc64le:
> https://src.fedoraproject.org/rpms/kernel/blob/4af17bffde7a1eca9ab164e5de0e391c277998a4/f/kernel.spec#_1797

It feels somewhat wrong to add a strip just for ppc64le after make
install, but I guess we probably ought to do the same...
I don't have any hardware to test booting the result though, I'll submit
an update and ask for someone to test when it's done.
(bit busy but that doesn't take long, will do that tomorrow morning
before I forget)

Dominique Martinet | Asmadeus

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