linux-kernel - Re: [RFC PATCH v2] powerpc/papr_scm: Move duplicate definitions to common header files

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Date:   Wed, 08 Sep 2021 15:02:18 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Shivaprasad G Bhat <sbhat@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     nvdimm@...ts.linux.dev, aneesh.kumar@...ux.ibm.com,
        sbhat@...ux.ibm.com, vaibhav@...ux.ibm.com,
        dan.j.williams@...el.com
Subject: Re: [RFC PATCH v2] powerpc/papr_scm: Move duplicate definitions to
 common header files

Shivaprasad G Bhat <sbhat@...ux.ibm.com> writes:
> papr_scm and ndtest share common PDSM payload structs like
> nd_papr_pdsm_health. Presently these structs are duplicated across papr_pdsm.h
> and ndtest.h header files. Since 'ndtest' is essentially arch independent and can
> run on platforms other than PPC64, a way needs to be deviced to avoid redundancy
> and duplication of PDSM structs in future.
>
> So the patch proposes moving the PDSM header from arch/powerpc/include/uapi/ to
> the generic include/uapi/linux directory. Also, there are some #defines common
> between papr_scm and ndtest which are not exported to the user space. So, move
> them to a header file which can be shared across ndtest and papr_scm via newly
> introduced include/linux/papr_scm.h.
>
> Signed-off-by: Shivaprasad G Bhat <sbhat@...ux.ibm.com>
> Signed-off-by: Vaibhav Jain <vaibhav@...ux.ibm.com>
> Suggested-by: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
> ---
> Changelog:
>
> Since v1:
> Link: https://patchwork.kernel.org/project/linux-nvdimm/patch/162505488483.72147.12741153746322191381.stgit@56e104a48989/
> * Removed dependency on this patch for the other patches
>
>  MAINTAINERS                               |    2 
>  arch/powerpc/include/uapi/asm/papr_pdsm.h |  165 -----------------------------
>  arch/powerpc/platforms/pseries/papr_scm.c |   43 --------
>  include/linux/papr_scm.h                  |   48 ++++++++
>  include/uapi/linux/papr_pdsm.h            |  165 +++++++++++++++++++++++++++++

This doesn't make sense to me.

Anything with papr (or PAPR) in the name is fundamentally powerpc
specific, it doesn't belong in a generic header, or in a generic
location.

What's the actual problem you're trying to solve?

If it's just including papr_scm bits into ndtest.c then that should be
as simple as:

#ifdef __powerpc__
#include <asm/papr_scm.h>
#endif

Shouldn't it?

cheers