From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Dan Williams <dan.j.williams@intel.com>, akpm@linux-foundation.org
Cc: mhocko@suse.com, "Pavel Tatashin" <pasha.tatashin@soleen.com>,
linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, "Jérôme Glisse" <jglisse@redhat.com>,
osalvador@suse.de
Subject: Re: [PATCH v9 10/12] mm/devm_memremap_pages: Enable sub-section remap
Date: Sun, 16 Jun 2019 13:19:36 +0530 [thread overview]
Message-ID: <87zhmigeb3.fsf@linux.ibm.com> (raw)
In-Reply-To: <155977193326.2443951.14201009973429527491.stgit@dwillia2-desk3.amr.corp.intel.com>
Dan Williams <dan.j.williams@intel.com> writes:
> Teach devm_memremap_pages() about the new sub-section capabilities of
> arch_{add,remove}_memory(). Effectively, just replace all usage of
> align_start, align_end, and align_size with res->start, res->end, and
> resource_size(res). The existing sanity check will still make sure that
> the two separate remap attempts do not collide within a sub-section (2MB
> on x86).
>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Toshi Kani <toshi.kani@hpe.com>
> Cc: Jérôme Glisse <jglisse@redhat.com>
> Cc: Logan Gunthorpe <logang@deltatee.com>
> Cc: Oscar Salvador <osalvador@suse.de>
> Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
> kernel/memremap.c | 61 +++++++++++++++++++++--------------------------------
> 1 file changed, 24 insertions(+), 37 deletions(-)
>
> diff --git a/kernel/memremap.c b/kernel/memremap.c
> index 57980ed4e571..a0e5f6b91b04 100644
> --- a/kernel/memremap.c
> +++ b/kernel/memremap.c
> @@ -58,7 +58,7 @@ static unsigned long pfn_first(struct dev_pagemap *pgmap)
> struct vmem_altmap *altmap = &pgmap->altmap;
> unsigned long pfn;
>
> - pfn = res->start >> PAGE_SHIFT;
> + pfn = PHYS_PFN(res->start);
> if (pgmap->altmap_valid)
> pfn += vmem_altmap_offset(altmap);
> return pfn;
> @@ -86,7 +86,6 @@ static void devm_memremap_pages_release(void *data)
> struct dev_pagemap *pgmap = data;
> struct device *dev = pgmap->dev;
> struct resource *res = &pgmap->res;
> - resource_size_t align_start, align_size;
> unsigned long pfn;
> int nid;
>
> @@ -96,25 +95,21 @@ static void devm_memremap_pages_release(void *data)
> pgmap->cleanup(pgmap->ref);
>
> /* pages are dead and unused, undo the arch mapping */
> - align_start = res->start & ~(PA_SECTION_SIZE - 1);
> - align_size = ALIGN(res->start + resource_size(res), PA_SECTION_SIZE)
> - - align_start;
> -
> - nid = page_to_nid(pfn_to_page(align_start >> PAGE_SHIFT));
> + nid = page_to_nid(pfn_to_page(PHYS_PFN(res->start)));
Why do we not require to align things to subsection size now?
-aneesh
next prev parent reply other threads:[~2019-06-16 7:49 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-05 21:57 [PATCH v9 00/12] mm: Sub-section memory hotplug support Dan Williams
2019-06-05 21:57 ` [PATCH v9 01/12] mm/sparsemem: Introduce struct mem_section_usage Dan Williams
2019-06-06 17:34 ` Oscar Salvador
2019-06-16 13:11 ` Wei Yang
2019-06-18 21:56 ` Dan Williams
2019-06-19 2:13 ` Wei Yang
2019-06-05 21:57 ` [PATCH v9 02/12] mm/sparsemem: Add helpers track active portions of a section at boot Dan Williams
2019-06-06 16:55 ` Oscar Salvador
2019-06-17 22:21 ` Wei Yang
2019-06-17 22:32 ` Dan Williams
2019-06-18 1:03 ` Wei Yang
2019-06-19 3:15 ` Dan Williams
2019-06-05 21:58 ` [PATCH v9 03/12] mm/hotplug: Prepare shrink_{zone, pgdat}_span for sub-section removal Dan Williams
2019-06-18 1:42 ` Wei Yang
2019-06-19 3:40 ` Dan Williams
2019-06-05 21:58 ` [PATCH v9 04/12] mm/sparsemem: Convert kmalloc_section_memmap() to populate_section_memmap() Dan Williams
2019-06-06 17:02 ` Oscar Salvador
2019-06-16 6:06 ` Aneesh Kumar K.V
2019-06-05 21:58 ` [PATCH v9 05/12] mm/hotplug: Kill is_dev_zone() usage in __remove_pages() Dan Williams
2019-06-05 21:58 ` [PATCH v9 06/12] mm: Kill is_dev_zone() helper Dan Williams
2019-06-18 3:35 ` Wei Yang
2019-06-05 21:58 ` [PATCH v9 07/12] mm/sparsemem: Prepare for sub-section ranges Dan Williams
2019-06-06 17:21 ` Oscar Salvador
2019-06-06 18:16 ` Dan Williams
2019-06-14 8:39 ` David Hildenbrand
2019-06-05 21:58 ` [PATCH v9 08/12] mm/sparsemem: Support sub-section hotplug Dan Williams
2019-06-07 8:33 ` Oscar Salvador
2019-06-07 15:38 ` Dan Williams
2019-06-07 21:41 ` Oscar Salvador
2019-06-05 21:58 ` [PATCH v9 09/12] mm: Document ZONE_DEVICE memory-model implications Dan Williams
2019-06-05 21:58 ` [PATCH v9 10/12] mm/devm_memremap_pages: Enable sub-section remap Dan Williams
2019-06-07 8:56 ` Oscar Salvador
2019-06-16 7:49 ` Aneesh Kumar K.V [this message]
2019-06-05 21:58 ` [PATCH v9 11/12] libnvdimm/pfn: Fix fsdax-mode namespace info-block zero-fields Dan Williams
2019-06-06 21:46 ` Andrew Morton
2019-06-06 22:06 ` Dan Williams
2019-06-07 19:54 ` Andrew Morton
2019-06-07 20:09 ` Dan Williams
2019-06-12 9:41 ` Aneesh Kumar K.V
2019-06-05 21:59 ` [PATCH v9 12/12] libnvdimm/pfn: Stop padding pmem namespaces to section alignment Dan Williams
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87zhmigeb3.fsf@linux.ibm.com \
--to=aneesh.kumar@linux.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=dan.j.williams@intel.com \
--cc=jglisse@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-nvdimm@lists.01.org \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
--cc=pasha.tatashin@soleen.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).