linux-kernel - Re: [PATCH v7 1/5] mm: page_alloc: remain memblock_next_valid

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Message-ID: <20180405112357.GA2647@bombadil.infradead.org>
Date:   Thu, 5 Apr 2018 04:23:57 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Jia He <hejianet@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        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>,
        Wei Yang <richard.weiyang@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Philip Derrin <philip@....systems>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        James Morse <james.morse@....com>,
        Steve Capper <steve.capper@....com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Kemi Wang <kemi.wang@...el.com>,
        Petr Tesarik <ptesarik@...e.com>,
        YASUAKI ISHIMATSU <yasu.isimatu@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Nikolay Borisov <nborisov@...e.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Daniel Vacek <neelx@...hat.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Jia He <jia.he@...-semitech.com>
Subject: Re: [PATCH v7 1/5] mm: page_alloc: remain memblock_next_valid_pfn()
 on arm and arm64

On Thu, Apr 05, 2018 at 01:04:34AM -0700, Jia He wrote:
>  create mode 100644 include/linux/arm96_common.h

'arm96_common'?!  No.  Just no.

The right way to share common code is to create a header file (or use
an existing one), either in asm-generic or linux, with a #ifdef CONFIG_foo
block and then 'select foo' in the arm Kconfig files.  That allows this
common code to be shared, maybe with powerpc or x86 or ... in the future.