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Date:   Tue, 13 Aug 2019 09:48:43 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@sifive.com>
To:     Logan Gunthorpe <logang@deltatee.com>
cc:     Greentime Hu <green.hu@gmail.com>, Rob Herring <robh@kernel.org>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andrew Waterman <andrew@sifive.com>,
        Palmer Dabbelt <palmer@sifive.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Stephen Bates <sbates@raithlin.com>,
        Olof Johansson <olof@lixom.net>, greentime.hu@sifive.com,
        linux-riscv@lists.infradead.org,
        Michael Clark <michaeljclark@mac.com>,
        Christoph Hellwig <hch@lst.de>, linux-mm@kvack.org
Subject: Re: [PATCH v4 2/2] RISC-V: Implement sparsemem
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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