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    SubjectRe: [PATCH v4 0/8] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag
    On Tue, 26 Jan 2021, Will Deacon wrote:
    > On Wed, Jan 20, 2021 at 05:36:04PM +0000, Will Deacon wrote:
    > > Hi all,
    > >
    > > This is version four of the patches I previously posted here:
    > >
    > > v1: https://lore.kernel.org/r/20201209163950.8494-1-will@kernel.org
    > > v2: https://lore.kernel.org/r/20210108171517.5290-1-will@kernel.org
    > > v3: https://lore.kernel.org/r/20210114175934.13070-1-will@kernel.org
    > >
    > > The patches allow architectures to opt-in at runtime for faultaround
    > > mappings to be created as 'old' instead of 'young'. Although there have
    > > been previous attempts at this, they failed either because the decision
    > > was deferred to userspace [1] or because it was done unconditionally and
    > > shown to regress benchmarks for particular architectures [2].
    > >
    > > The big change since v3 is that the immutable fields of 'struct vm_fault'
    > > now live in a 'const' anonymous struct. Although Clang will silently
    > > accept modifications to these fields [3], GCC emits an error. The
    > > resulting diffstat is _considerably_ more manageable with this approach.
    >
    > The only changes I have pending against this series are cosmetic (commit
    > logs). Can I go ahead and queue this in the arm64 tree so that it can sit
    > in linux-next for a bit? (positive or negative feedback appreciated!).

    That would be fine by me: I ran v3 on rc3, then the nicer smaller v4
    on rc4, and saw no problems when running either of them (x86_64 only).

    Hugh

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