Re: [RFC PATCH] x86/boot: use zstd -19 if building for 32-bit

[Ard Biesheuvel]

On Tue, 28 Jul 2026, at 17:31, Mingcong Bai wrote:
> When using native build environments (that is, 32-bit x86 chroot/container
> as build environment for 32-bit x86 binaries), `zstd -22' requests more
> virtual memory than that could be allowed on 32-bit hosts.
>
> Introduce `cmd_zstd_with_size' for CONFIG_X86_32 builds.
>
> This is quite possibly just stupid... But there doesn't seem to be a way
> to detect the host environment. So I'm sending this patch as a means to
> ask for your opinions.
>
> Any help would be greated appreciated.
>
> Signed-off-by: Mingcong Bai <jeffbai@xxxxxxx>
> ---
>  arch/x86/boot/compressed/Makefile | 5 +++++
>  scripts/Makefile.lib              | 3 +++
>  2 files changed, 8 insertions(+)
>

Doesn't this mean ZSTD -22 is generally broken on 32-bit? How is this
specific to the kernel?