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From: Dan Williams <dan.j.williams@intel.com>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Linux ACPI <linux-acpi@vger.kernel.org>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	linux-nvdimm <linux-nvdimm@lists.01.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/5] resource: Report parent to walk_iomem_res_desc() callback
Date: Tue, 17 Mar 2020 15:04:48 -0700	[thread overview]
Message-ID: <CAPcyv4goRP8EAfMX8oOANgzgm3Pn=wES42MCDXbP_x__-GW52g@mail.gmail.com> (raw)
In-Reply-To: <1848cdb9-8c19-d7fe-870c-175bd60bc364@amd.com>

On Thu, Mar 5, 2020 at 6:42 AM Tom Lendacky <thomas.lendacky@amd.com> wrote:
>
> On 3/2/20 4:20 PM, Dan Williams wrote:
> > In support of detecting whether a resource might have been been claimed,
> > report the parent to the walk_iomem_res_desc() callback. For example,
> > the ACPI HMAT parser publishes "hmem" platform devices per target range.
> > However, if the HMAT is disabled / missing a fallback driver can attach
> > devices to the raw memory ranges as a fallback if it sees unclaimed /
> > orphan "Soft Reserved" resources in the resource tree.
> >
> > Otherwise, find_next_iomem_res() returns a resource with garbage data
> > from the stack allocation in __walk_iomem_res_desc() for the res->parent
> > field.
>
> Just wondering if we shouldn't just copy the complete resource struct and
> just override the start and end values? That way, if some code in the
> future wants to look at sibling or child values, another change isn't needed.
>
> Just a thought.

Thanks for taking a look. I think it's ok to come update this again if
that need arises.
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  reply	other threads:[~2020-03-17 22:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-02 22:19 [PATCH 0/5] Manual definition of Soft Reserved memory devices Dan Williams
2020-03-02 22:20 ` [PATCH 1/5] ACPI: NUMA: Add 'nohmat' option Dan Williams
2020-03-18  0:08   ` Dan Williams
2020-03-18  8:24     ` Rafael J. Wysocki
2020-03-18 17:39       ` Dan Williams
2020-03-19  9:30         ` Rafael J. Wysocki
2020-03-02 22:20 ` [PATCH 2/5] efi/fake_mem: Arrange for a resource entry per efi_fake_mem instance Dan Williams
2020-03-03  8:01   ` Ard Biesheuvel
2020-03-02 22:20 ` [PATCH 3/5] ACPI: HMAT: Refactor hmat_register_target_device to hmem_register_device Dan Williams
2020-03-02 22:20 ` [PATCH 4/5] resource: Report parent to walk_iomem_res_desc() callback Dan Williams
2020-03-05 14:42   ` Tom Lendacky
2020-03-17 22:04     ` Dan Williams [this message]
2020-03-02 22:20 ` [PATCH 5/5] ACPI: HMAT: Attach a device for each soft-reserved range Dan Williams
2020-03-06 20:07 ` [PATCH 0/5] Manual definition of Soft Reserved memory devices Jeff Moyer
2020-03-06 21:05   ` Dan Williams

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