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Subject: Re: [PATCH 0/6] rapidio: move Kconfig menu definition to subsystem
To:     Alexei Colin <acolin@isi.edu>,
        Alexandre Bounine <alex.bou9@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     John Paul Walters <jwalters@isi.edu>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Russell King <linux@armlinux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>,
        Will Deacon <will.deacon@arm.com>,
        Ralf Baechle <ralf@linux-mips.org>,
        Paul Burton <paul.burton@mips.com>,
        Alexander Sverdlin <alexander.sverdlin@nokia.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Anvin <hpa@zytor.com>,
        Matt Porter <mporter@kernel.crashing.org>, x86@kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20180730225035.28365-1-acolin@isi.edu>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <db90c65d-b6da-1f57-43c6-e105fc6f1704@infradead.org>
Date:   Mon, 30 Jul 2018 18:08:42 -0700
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On 07/30/2018 03:50 PM, Alexei Colin wrote:
> The top-level Kconfig entry for RapidIO subsystem is currently
> duplicated in several architecture-specific Kconfig files. This set of
> patches does two things:
> 
> 1. Move the Kconfig menu definition into the RapidIO subsystem and
> remove the duplicate definitions from arch Kconfig files.
> 
> 2. Enable RapidIO Kconfig menu entry for arm and arm64 architectures,
> where it was not enabled before. I tested that subsystem and drivers
> build successfully for both architectures, and tested that the modules
> load on a custom arm64 Qemu model.
> 
> For all architectures, RapidIO menu should be offered when either:
> (1) The platform has a PCI bus (which host a RapidIO module on the bus).
> (2) The platform has a RapidIO IP block (connected to a system bus, e.g.
> AXI on ARM). In this case, 'select HAS_RAPIDIO' should be added to the
> 'config ARCH_*' menu entry for the SoCs that offer the IP block.
> 
> Prior to this patchset, different architectures used different criteria:
> * powerpc: (1) and (2)
> * mips: (1) and (2) after recent commit into next that added (2):
>   https://www.linux-mips.org/archives/linux-mips/2018-07/msg00596.html
>   fc5d988878942e9b42a4de5204bdd452f3f1ce47
>   491ec1553e0075f345fbe476a93775eabcbc40b6
> * x86: (1)
> * arm,arm64: none (RapidIO menus never offered)
> 
> Responses to feedback from prior submission (thanks for the reviews!):
> http://lists.infradead.org/pipermail/linux-arm-kernel/2018-July/593347.html
> http://lists.infradead.org/pipermail/linux-arm-kernel/2018-July/593349.html
> 
> Changelog:
>   * Moved Kconfig entry into RapidIO subsystem instead of duplicating
> 
> In the current patchset, I took the approach of adding '|| PCI' to the
> depends in the subsystem. I did try the alterantive approach mentioned
> in the reviews for v1 of this patch, where the subsystem Kconfig does
> not add a '|| PCI' and each per-architecture Kconfig has to add a
> 'select HAS_RAPIDIO if PCI' and SoCs with IP blocks have to also add
> 'select HAS_RAPIDIO'. This works too but requires each architecture's
> Kconfig to add the line for RapidIO (whereas current approach does not
> require that involvement) and also may create a false impression that
> the dependency on PCI is strict.
> 
> We appreciate the suggestion for also selecting the RapdiIO subsystem for
> compilation with COMPILE_TEST, but hope to address it in a separate
> patchset, localized to the subsystem, since it will need to change
> depends on all drivers, not just on the top level, and since this
> patch now spans multiple architectures.
> 
> 
> Alexei Colin (6):
>   rapidio: define top Kconfig menu in driver subtree
>   x86: factor out RapidIO Kconfig menu
>   powerpc: factor out RapidIO Kconfig menu entry
>   mips: factor out RapidIO Kconfig entry
>   arm: enable RapidIO menu in Kconfig
>   arm64: enable RapidIO menu in Kconfig
> 
>  arch/arm/Kconfig        |  2 ++
>  arch/arm64/Kconfig      |  2 ++
>  arch/mips/Kconfig       | 11 -----------
>  arch/powerpc/Kconfig    | 13 +------------
>  arch/x86/Kconfig        |  8 --------
>  drivers/rapidio/Kconfig | 15 +++++++++++++++
>  6 files changed, 20 insertions(+), 31 deletions(-)
> 

LGTM.

Acked-by: Randy Dunlap <rdunlap@infradead.org> # for the series

thanks,
-- 
~Randy