linux-kernel - Re: [RESEND PATCH v10 1/6] arm: arm64: introduce CONFIG_HAVE_MEMBLOCK_PFN

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Message-ID: <20180817145052.aizhi6n66vxblriq@armageddon.cambridge.arm.com>
Date:   Fri, 17 Aug 2018 15:50:53 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Jia He <hejianet@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Wei Yang <richard.weiyang@...il.com>, linux-mm@...ck.org,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Petr Tesarik <ptesarik@...e.com>,
        Nikolay Borisov <nborisov@...e.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Laura Abbott <labbott@...hat.com>,
        Daniel Vacek <neelx@...hat.com>, Mel Gorman <mgorman@...e.de>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Kees Cook <keescook@...omium.org>,
        Philip Derrin <philip@....systems>,
        YASUAKI ISHIMATSU <yasu.isimatu@...il.com>,
        Jia He <jia.he@...-semitech.com>,
        Kemi Wang <kemi.wang@...el.com>,
        linux-arm-kernel@...ts.infradead.org,
        Steve Capper <steve.capper@....com>,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [RESEND PATCH v10 1/6] arm: arm64: introduce
 CONFIG_HAVE_MEMBLOCK_PFN_VALID

On Fri, Jul 06, 2018 at 05:01:10PM +0800, Jia He wrote:
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 42c090c..26d75f4 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -778,6 +778,10 @@ config ARCH_SELECT_MEMORY_MODEL
>  config HAVE_ARCH_PFN_VALID
>  	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
>  
> +config HAVE_MEMBLOCK_PFN_VALID
> +	def_bool y
> +	depends on HAVE_ARCH_PFN_VALID
> +
>  config HW_PERF_EVENTS
>  	def_bool y
>  	depends on ARM_PMU
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 94af022..28fcf54 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -137,6 +137,9 @@ config HAVE_MEMBLOCK_NODE_MAP
>  config HAVE_MEMBLOCK_PHYS_MAP
>  	bool
>  
> +config HAVE_MEMBLOCK_PFN_VALID
> +	bool

Since you defined HAVE_MEMBLOCK_PFN_VALID here, do we need to define it
in the arch code as well? If kept it in the mm/Kconfig only, you could
just select it in the arch HAVE_ARCH_PFN_VALID entry:

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index d0a53cc6293a..cd230c77e122 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -787,6 +787,7 @@ config ARCH_FLATMEM_ENABLE
 
 config HAVE_ARCH_PFN_VALID
 	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
+	select HAVE_MEMBLOCK_PFN_VALID
 
 config HW_PERF_EVENTS
 	def_bool y

(similarly for arch/arm)

-- 
Catalin