linux-kernel - Re: [PATCH v4 2/2] RISC-V: Implement sparsemem

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Message-ID: <alpine.DEB.2.21.9999.1908130947130.30024@viisi.sifive.com>
Date:   Tue, 13 Aug 2019 09:48:43 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Logan Gunthorpe <logang@...tatee.com>
cc:     Greentime Hu <green.hu@...il.com>, Rob Herring <robh@...nel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Waterman <andrew@...ive.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stephen Bates <sbates@...thlin.com>,
        Olof Johansson <olof@...om.net>, greentime.hu@...ive.com,
        linux-riscv@...ts.infradead.org,
        Michael Clark <michaeljclark@....com>,
        Christoph Hellwig <hch@....de>, linux-mm@...ck.org
Subject: Re: [PATCH v4 2/2] RISC-V: Implement sparsemem

On Tue, 13 Aug 2019, Paul Walmsley wrote:

> On Tue, 13 Aug 2019, Logan Gunthorpe wrote:
> 
> > On 2019-08-13 12:04 a.m., Greentime Hu wrote:
> > 
> > > Every architecture with mmu defines their own pfn_valid().
> > 
> > Not true. Arm64, for example just uses the generic implementation in
> > mmzone.h. 
> 
> arm64 seems to define their own:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/Kconfig#n899
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/mm/init.c#n235
> 
> While there are many architectures which have their own pfn_valid(); 
> oddly, almost none of them set HAVE_ARCH_PFN_VALID ?

(fixed the linux-mm@ address)


- Paul