Control: tag -1 moreinfo On Fri, 25 Apr 2025 11:38:14 +0200 John Paul Adrian Glaubitz <glaub...@physik.fu-berlin.de> wrote: > Source: linux > Version: 6.12.22-1 > Severity: normal > User: debian-sup...@lists.debian.org > Usertags: sh4 > X-Debbugs-Cc: debian-sup...@lists.debian.org > > Hello, > > src:linux currently fails to build from source on sh4 due to the kernel > image compression set to XZ (CONFIG_KERNEL_XZ=y).
You didn't say exactly why xz is a problem, but looking at the logs I see xz sometimes failing with an out-of-memory error. Are the sh4 builds running natively? > I tried setting the > compression to GZIP (CONFIG_KERNEL_GZIP=y) in debian/config/sh4/config > and disabling CONFIG_KERNEL_XZ with the following configuration: > > ## > ## file: init/Kconfig > ## > ## choice: Kernel compression mode > #. Decompression is done by the bootloader, so we need to be > #. conservative here. > CONFIG_KERNEL_GZIP=y > # CONFIG_KERNEL_XZ is not set > # CONFIG_KERNEL_ZSTD is not set > ## end choice > ## choice: Compiler optimization level > CONFIG_CC_OPTIMIZE_FOR_SIZE=y > ## end choice > > But for some reason that still resulted in CONFIG_KERNEL_XZ=y ending up > in the .config file of the sh7751lr kernel image. That change should work, and it does work for me. > However, I can enter the schroot after the failed build, edit the .config > files in > /build/reproducible-path/linux-6.12.22/debian/build/build_sh4_none_sh7751r > and manually set CONFIG_KERNEL_GZIP=y and # CONFIG_KERNEL_XZ is not set which > makes the kernel build succeed when just running "make". > > Thus, could you modify the configuration on sh4 such that the kernel is > compressed with GZIP instead of XZ (and ZSTD) by default so that the > kernel package builds again on sh4? > > Using XZ doesn't make sense on sh4 with its small image sizes anyway. Well, speaking of that, you have not yet reported back on whether my fix-sh7785lcr branch works. I just rebased this and uploaded fresh packages to <https://people.debian.org/~benh/packages/linux-sh4/>. If we apply this config change on top of that, the kernel image size for sh7785lcr will again go over the 4 MiB limit. So we would need to either (1) trim the config further or (2) drop the sh7785lcr flavour. I do not intend to spend more time on (1) so this is really up to you (or other sh4 porters) now. Ben. -- Ben Hutchings It's easier to fight for one's principles than to live up to them.
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