Re: [PATCH] ARM: Allow DEBUG_UNCOMPRESS on ARCH_MULTIPLATFORM

[Arnd Bergmann]

On Sun, Jan 29, 2023, at 17:00, Jonathan Neuschäfer wrote:
> A kernel with DEBUG_UNCOMPRESS=y will only work on one platform, but
> that is already the case with DEBUG_LL=y (and documented in its help
> text), and DEBUG_UNCOMPRESS depends on DEBUG_LL. Therefore, I don't
> think users need to be prevented from enabling DEBUG_UNCOMPRESS on
> ARCH_MULTIPLATFORM kernels.
>
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>

I think we should instead change the help text for CONFIG_DEBUG_LL.

There is a very significant difference between the requirements
of DEBUG_LL compared to DEBUG_UNCOMPRESS. The former only provides
the platform specific functions but does not call them unless
a user explicitly passes the "earlyprintk" command line argument
or adds explicit function calls to printascii(), while the latter
makes the kernel immediately unbootable.

     Arnd