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    SubjectRe: [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

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