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Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4

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On Fri, 25 Apr 2025 11:38:14 +0200 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> wrote:
> Source: linux
> Version: 6.12.22-1
> Severity: normal
> User: debian-superh@lists.debian.org
> Usertags: sh4
> X-Debbugs-Cc: debian-superh@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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Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-04-25 11:40 +0200
  Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 19:00 +0200
    Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-05-02 20:10 +0200
      Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 20:20 +0200
        Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-05-02 20:20 +0200
    Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 21:00 +0200
  Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 20:20 +0200
    Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-05-02 20:20 +0200
      Bug#1104080: linux: Please build with CONFIG_KERNEL_GZIP=y instead of CONFIG_KERNEL_XZ=y on sh4 Ben Hutchings <ben@decadent.org.uk> - 2025-05-02 20:30 +0200

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