** Changed in: linux (Ubuntu Focal)
Status: Triaged => In Progress
** Changed in: ubuntu-z-systems
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1863116
Title:
debian/rules editconfigs does not work on s390x to change s390x only
configs
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
In Progress
Status in linux source package in Groovy:
Fix Released
Bug description:
SRU Justification:
==================
[Impact]
* With focal (and even eoan) it is no longer possible to run the
updateconfigs Debian build rule (needed in case of kernel option
updates) on all supported arhitectures.
* Changes upstream led to the fact cross platform functions are now
triggered in case the config is changed, but amd64 is the only
platform that has all needed crossbuild components to satisfy this.
* Hence one can still run updateconfigs on amd64 and proceed with the
compile on the target platform.
* With bionic and earlier this was possible on all supported target
platforms; now it only works on amd64.
* But it's not always the case that people who work on Ubuntu for non-
amd64 have an Ubuntu amd64 on top, nor would such a requirement be
acceptable.
[Fix]
* Patch:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1863116/+attachment/5397080/+files/0001
-UBUNTU-Packaging-kernelconfig-only-update-edit-confi.patch
[Test Case]
* Setup an Ubuntu 20.04 on a platform other than amd64 (like in my
case s390x) and install all packages needed for a kernel build.
* 'git clone' or 'pull-lp-source' the kernel sources to that system
(e.g. focal).
* Change a kernel config option and run clean (fakeroot debian/rules
clean), updateconfigs (fakeroot debian/rules updateconfigs) followed
by a build (like: fakeroot debian/rules binary-headers binary-generic
binary-perarch).
* Without the patch the build will fail with error messages similar to these:
scripts/Kconfig.include:35: compiler 'x86_64-linux-gnu-gcc' not found
make[3]: *** [../scripts/kconfig/Makefile:73: syncconfig] Error 1
make[2]: *** [/home/ubuntu/linux-5.4-5.4.0/Makefile:594: syncconfig] Error
2
make[2]: Leaving directory '/home/ubuntu/linux-5.4-5.4.0/build'
make[1]: *** [Makefile:179: sub-make] Error 2
make[1]: Leaving directory '/home/ubuntu/linux-5.4-5.4.0'
make: *** [debian/rules.d/1-maintainer.mk:44: editconfigs] Error 2
* Doing the same on a non-amd64 with the patch in place (or on amd64
even w/o the patch), the build will succeed.
[Regression Potential]
* The regression risk is moderate since it's build time problem (not
at kernel run time).
* But anyway in case this patch is broken, kernel builds may be
screwed up entirely,
* but that is very unlikely since the modifications are limited to
/debian/scripts/misc/kernelconfig.
* Hence issues in kernelconfig could occur and even break
updateconfigs on amd64.
* But the patch was successully tested on different architectures with
focal.
[Other]
* Patch need to be applied to focal and higher (hence incl. groovy).
__________
On s390x
pull-lp-source linux-5.4
cd linux-*
fakeroot ./debian/rules clean
./debian/rules editconfig
dh_testdir;
/bin/bash -e debian/scripts/misc/kernelconfig editconfigs
Do you want to edit config: amd64/config.flavour.generic? [Y/n] n
...
scripts/Kconfig.include:35: compiler 'x86_64-linux-gnu-gcc' not found
make[3]: *** [../scripts/kconfig/Makefile:73: syncconfig] Error 1
make[2]: *** [/home/ubuntu/linux-5.4-5.4.0/Makefile:594: syncconfig] Error 2
make[2]: Leaving directory '/home/ubuntu/linux-5.4-5.4.0/build'
make[1]: *** [Makefile:179: sub-make] Error 2
make[1]: Leaving directory '/home/ubuntu/linux-5.4-5.4.0'
make: *** [debian/rules.d/1-maintainer.mk:44: editconfigs] Error 2
And indeed i do not have x86_64-linux-gnu-gcc crosscompiler available
to build on s390x for amd64, and also I don't want to touch amd64
configs. Only s390x ones.
As a user, I should be able to rebuild ports architecture kernel with
tweaked config for testing, self-hosted without cross-compilers.
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