linux-kernel - Re: [PATCH v10 08/13] mm/sparsemem: Prepare for sub-section ranges

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Message-ID: <CAPcyv4jzELzrf-p6ujUwdXN2FRe0WCNhpTziP2-z4-8uBSSp7A@mail.gmail.com>
Date:   Thu, 20 Jun 2019 09:19:43 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Logan Gunthorpe <logang@...tatee.com>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Linux MM <linux-mm@...ck.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 08/13] mm/sparsemem: Prepare for sub-section ranges

On Thu, Jun 20, 2019 at 3:31 AM David Hildenbrand <david@...hat.com> wrote:
>
> On 19.06.19 07:52, Dan Williams wrote:
> > Prepare the memory hot-{add,remove} paths for handling sub-section
> > ranges by plumbing the starting page frame and number of pages being
> > handled through arch_{add,remove}_memory() to
> > sparse_{add,remove}_one_section().
> >
> > This is simply plumbing, small cleanups, and some identifier renames. No
> > intended functional changes.
> >
> > Cc: Michal Hocko <mhocko@...e.com>
> > Cc: Vlastimil Babka <vbabka@...e.cz>
> > Cc: Logan Gunthorpe <logang@...tatee.com>
> > Cc: Oscar Salvador <osalvador@...e.de>
> > Reviewed-by: Pavel Tatashin <pasha.tatashin@...een.com>
> > Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> > ---
> >  include/linux/memory_hotplug.h |    5 +-
> >  mm/memory_hotplug.c            |  114 +++++++++++++++++++++++++---------------
> >  mm/sparse.c                    |   16 ++----
> >  3 files changed, 81 insertions(+), 54 deletions(-)
[..]
> > @@ -528,31 +556,31 @@ static void __remove_section(struct zone *zone, struct mem_section *ms,
> >   * sure that pages are marked reserved and zones are adjust properly by
> >   * calling offline_pages().
> >   */
> > -void __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
> > +void __remove_pages(struct zone *zone, unsigned long pfn,
> >                   unsigned long nr_pages, struct vmem_altmap *altmap)
> >  {
> > -     unsigned long i;
> >       unsigned long map_offset = 0;
> > -     int sections_to_remove;
> > +     int i, start_sec, end_sec;
>
> As mentioned in v9, use "unsigned long" for start_sec and end_sec please.

Honestly I saw you and Andrew going back and forth about "unsigned
long i" that I thought this would be handled by a follow on patchset
when that debate settled.