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

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Date:   Thu, 20 Jun 2019 18:35:54 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Dan Williams <dan.j.williams@...el.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 20.06.19 18:19, Dan Williams wrote:
> 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.
> 

I'll send a fixup then, once this patch set is final - hoping I won't
forget about it (that's why I asked about using these types in the first
place).

-- 

Thanks,

David / dhildenb