linux-kernel - Re: [PATCH 0/3] move __HAVE_ARCH_PTE

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Date:   Mon, 9 Apr 2018 16:07:21 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Jerome Glisse <jglisse@...hat.com>,
        aneesh.kumar@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
        mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <albert@...ive.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH 0/3] move __HAVE_ARCH_PTE_SPECIAL in Kconfig

On Mon 09-04-18 15:57:06, Laurent Dufour wrote:
> The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
> per architecture header files. This doesn't allow to make other
> configuration dependent on it.
> 
> This series is moving the __HAVE_ARCH_PTE_SPECIAL into the Kconfig files,
> setting it automatically when architectures was already setting it in
> header file.
> 
> There is no functional change introduced by this series.

I would just fold all three patches into a single one. It is much easier
to review that those selects are done properly when you can see that the
define is set for the same architecture.

In general, I like the patch. It is always quite painful to track per
arch defines.

> Laurent Dufour (3):
>   mm: introduce ARCH_HAS_PTE_SPECIAL
>   mm: replace __HAVE_ARCH_PTE_SPECIAL
>   mm: remove __HAVE_ARCH_PTE_SPECIAL
> 
>  Documentation/features/vm/pte_special/arch-support.txt | 2 +-
>  arch/arc/Kconfig                                       | 1 +
>  arch/arc/include/asm/pgtable.h                         | 2 --
>  arch/arm/Kconfig                                       | 1 +
>  arch/arm/include/asm/pgtable-3level.h                  | 1 -
>  arch/arm64/Kconfig                                     | 1 +
>  arch/arm64/include/asm/pgtable.h                       | 2 --
>  arch/powerpc/Kconfig                                   | 1 +
>  arch/powerpc/include/asm/book3s/64/pgtable.h           | 3 ---
>  arch/powerpc/include/asm/pte-common.h                  | 3 ---
>  arch/riscv/Kconfig                                     | 1 +
>  arch/s390/Kconfig                                      | 1 +
>  arch/s390/include/asm/pgtable.h                        | 1 -
>  arch/sh/Kconfig                                        | 1 +
>  arch/sh/include/asm/pgtable.h                          | 2 --
>  arch/sparc/Kconfig                                     | 1 +
>  arch/sparc/include/asm/pgtable_64.h                    | 3 ---
>  arch/x86/Kconfig                                       | 1 +
>  arch/x86/include/asm/pgtable_types.h                   | 1 -
>  include/linux/pfn_t.h                                  | 4 ++--
>  mm/Kconfig                                             | 3 +++
>  mm/gup.c                                               | 4 ++--
>  mm/memory.c                                            | 2 +-
>  23 files changed, 18 insertions(+), 24 deletions(-)
> 
> -- 
> 2.7.4

-- 
Michal Hocko
SUSE Labs