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    SubjectRe: [PATCH v6 2/9] mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG
    On Tue, Jan 4, 2022 at 12:23 PM Yu Zhao <yuzhao@google.com> wrote:
    >
    > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    > index 5c2ccb85f2ef..5a4843242f09 100644
    > --- a/arch/x86/Kconfig
    > +++ b/arch/x86/Kconfig
    > @@ -85,6 +85,7 @@ config X86
    > + select ARCH_HAS_NONLEAF_PMD_YOUNG if X86_64

    Why is this limited to 64-bit?

    I'm ok with that - maybe it's a simple case of "this is not worth
    doing on 32-bit", but I'd like the explanation to be written out.

    Right now the commit message literally points the architecture manual
    that sio relevant for both 32-bit and 64-bit - and then the patch
    itself makes it 64-bit only.

    Linus

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