Re: [PATCH] um: let 'make clean' properly clean underlying SUBARCH as well

[Johannes Berg]

On Wed, 2025-05-07 at 15:38 -0600, Shuah Khan wrote:
> My workflow:
> 
> - Build kernel on x86_64 with CONFIG_AMD_MEM_ENCRYPT enabled
> 
> - Check for arch/x86/realmode/rm/pasyms.h
>    ls arch/x86/realmode/rm/pasyms.h
>       arch/x86/realmode/rm/pasyms.h
> 
> - make ARCH=um O=/linux/build
>    
>    This patch cleans the source tree, but doesn't remove
>    arch/x86/realmode/rm/pasyms.h
> 
> - ls arch/x86/realmode/rm/pasyms.h
>       arch/x86/realmode/rm/pasyms.h

Is that even _expected_ to work? If you have x86 built first, I'd almost
expect you to have to do "make ARCH=x86 mrproper" before building
another ARCH. I don't see how ARCH=um would know how to do a full clean
up of ARCH=x86, unless this is somehow arch-independent?

Or maybe that's not an issue with other architectures because UML is
special in that it uses parts of x86?

Though I guess the patch here should make it do that, more or less, but
it can't, likely because you're also switching from in-tree build to O=
build?

johannes