Re: [PATCH] x86/setup: do not include kexec_handover.h from asm/setup.h

[Mike Rapoport <rppt@kernel.org>]

On Wed, Jul 01, 2026 at 09:57:14AM -0700, Borislav Petkov wrote:
> On Wed, Jul 01, 2026 at 05:15:33PM +0200, Pratyush Yadav wrote:
> > From: "Pratyush Yadav (Google)" <pratyush@kernel.org>
> > 
> > x86 asm/setup.h includes linux/kexec_handover.h. This is because it is
> > used by setup.c and kaslr.c. But this inclusion is problematic. The
> > header is included in many places, so it results in the KHO header being
> > propagated there. Also, the setup header is used by realmode code. If
> > KHO header includes things like mm.h, it causes a big dump of
> > compliation failures.
> 
> This is exactly why we are trying hard to block people from using more linux/
> namespace headers in the decompressor code. Please split it and put only the
> bits that are needed by the decompressor into a header in
> arch/x86/include/asm/shared/ and use that in the decompressor.
> 
> There are examples there.

The examples there are really x86 specific.
KHO needs decompressor to recognise 'struct kho_scratch' that's defined in
include/linux/kexec_handover.h

I see there's a duplicated 'struct efi_unaccepted_memory' for decompressor
needs, should KHO do the same for 'struct kho_scratch'?

-- 
Sincerely yours,
Mike.