Hi Michael,
I am working on two packaging issues with Fedora and CKI that I am hoping
you can give me some guidance on.
1 - Fedora has always packaged an eu-strip'd vmlinux file for powerpc. The
other arches we support used native compressed images. I was looking into
using powerpc's zImage (pseries) binary to remove the powerpc workarounds
in our rpm spec file.
However, the rpmbuild fails because it can't find a build-id with
eu-readelf -n zImage. Sure enough the build-id is found in vmlinux and
vmlinux.stripped but disappears with vmlinux.stripped.gz. I had hoped
arch/powerpc/boot/addnote would stick it back in but it doesn't (I am
ignorant of how addnote works).
eu-readelf -n data
vmlinux:
Displaying notes found in: .notes
Owner Data size Description
GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID
bitstring)
Build ID: b4c026d72ead7b4316a221cddb7f2b10d75fb313
Linux 0x00000004 func
description data: 00 00 00 00
Linux 0x00000001 OPEN
description data: 00
PowerPC 0x00000004 NT_VERSION (version)
description data: 01 00 00 00
zImage:
Displaying notes found at file offset 0x00000158 with length 0x0000002c:
Owner Data size Description
PowerPC 0x00000018 Unknown note type: (0x00001275)
description data: ff ff ff ff 02 00 00 00 ff ff ff ff ff ff ff ff ff ff
ff ff 00 00 40 00
Displaying notes found at file offset 0x00000184 with length 0x00000044:
Owner Data size Description
IBM,RPA-Client-[...] 0x00000020 Unknown note type: (0x12759999)
description data: 00 00 00 00 00 00 00 40 00 00 00 00 00 00 00 28 00 00
00 01 ff ff ff ff 00 00 00 00 00 00 00 01
Is this something that can be addressed? Or should I/we expect the
build-id to never make it into the zImage and just continue with our
current vmlinux process?
2 - CKI builds kernels using 'make targz-pkg'. The arches we support
(x86_64, s390, aarch64) provide compressed binaries to package using
KBUILD_IMAGE or a specific entry in scripts/package/buildtar. As a result,
because powerpc doesn't have a KBUILD_IMAGE variable defined, the script
builds vmlinx and cp's that to vmlinux-kbuild. The problem with powerpc is
that vmlinux for us is huge ( >256MB) and cp'ing that to vmlinux-kbuild
occupies > 512MB of /boot and our distro runs out of disk space on that
partition.
I was hoping to add a patch to arch/powerpc/Makefile that defines
KBUILD_IMAGE:=$(boot)/zImage (mimicing arch/s390), which I believe would
solve our problem. However, that circles back to our first problem above.
Thoughts? Help?
Cheers,
Don
