Re: [PATCH v2] x86/Kconfig: Fix allyesconfig

[Andrew Morton]

On Wed, 16 Apr 2025 16:05:59 -0700 Guenter Roeck <linux@xxxxxxxxxxxx> wrote:

> 64-bit allyesconfig builds fail with
> 
> x86_64-linux-ld: kernel image bigger than KERNEL_IMAGE_SIZE
> 
> Bisect points to commit 6f110a5e4f99 ("Disable SLUB_TINY for build
> testing") as the responsible commit. Reverting that patch does indeed
> fix the problem. Further analysis shows that disabling SLUB_TINY enables
> KASAN, and that KASAN is responsible for the image size increase.
> 
> Solve the build problem by disabling KASAN for test builds.
> 

Excluding KASAN from COMPILE_TEST builds is regrettable.

Can we address this some other way?  One way might be to alter or
disable the KERNEL_IMAGE_SIZE check if COMPILE_TEST?  That will be sad
for anyone who tries to boot a COMPILE_TEST kernel, but who the heck
does that?