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    SubjectRe: [PATCH v2 0/6] Manual definition of Soft Reserved memory devices
    On Sun, Mar 22, 2020 at 5:28 PM Dan Williams <dan.j.williams@intel.com> wrote:
    >
    > Changes since v1 [1]:
    > - Kill the ifdef'ery in arch/x86/mm/numa.c (Rafael)
    >
    > - Add a dummy phys_to_target_node() for ARM64 (0day-robot)
    >
    > - Initialize ->child and ->sibling to NULL in the resource returned by
    > find_next_iomem_res() (Inspired by Tom's feedback even though it does
    > not set them like he suggested)
    >
    > - Collect Ard's Ack
    >
    > [1]: http://lore.kernel.org/r/158318759687.2216124.4684754859068906007.stgit@dwillia2-desk3.amr.corp.intel.com
    >
    > ---
    >
    > My primary motivation is making the dax_kmem facility useful to
    > shipping platforms that have performance differentiated memory, but
    > may not have EFI-defined soft-reservations / HMAT (or
    > non-EFI-ACPI-platform equivalent). I'm anticipating HMAT enabled
    > platforms where the platform firmware policy for what is
    > soft-reserved, or not, is not the policy the system owner would pick.
    > I'd also highlight Joao's work [2] (see the TODO section) as an
    > indication of the demand for custom carving memory resources and
    > applying the device-dax memory management interface.
    >
    > Given the current dearth of systems that supply an ACPI HMAT table, and
    > the utility of being able to manually define device-dax "hmem" instances
    > via the efi_fake_mem= option, relax the requirements for creating these
    > devices. Specifically, add an option (numa=nohmat) to optionally disable
    > consideration of the HMAT and update efi_fake_mem= to behave like
    > memmap=nn!ss in terms of delimiting device boundaries.
    >
    > [2]: https://lore.kernel.org/lkml/20200110190313.17144-1-joao.m.martins@oracle.com/
    >
    > With Ard's and Rafael's ack I'd feel ok taking this through the nvdimm
    > tree, please holler if anything still needs some fixups.

    Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

    for the whole series.

    Thanks!

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