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SubjectRe: [PATCH v1 2/4] mm/memory_hotplug: Handle unaligned start and nr_pages in online_pages_blocks()
On 09.08.19 23:46, Andrew Morton wrote:
> On Fri, 9 Aug 2019 14:56:59 +0200 David Hildenbrand <> wrote:
>> Take care of nr_pages not being a power of two and start not being
>> properly aligned. Essentially, what walk_system_ram_range() could provide
>> to us. get_order() will round-up in case it's not a power of two.
>> This should only apply to memory blocks that contain strange memory
>> resources (especially with holes), not to ordinary DIMMs.
> I'm assuming this doesn't fix any known runtime problem and that a
> -stable backport isn't needed.

Yeah, my understanding is that this would only apply when offlining and
re-onlining boot memory that contains such weird memory holes. I don't
think this is stable material.


>> Fixes: a9cd410a3d29 ("mm/page_alloc.c: memory hotplug: free pages as higher order")
> To that end, I replaced this with my new "Fixes-no-stable" in order to
> discourage -stable maintainers from overriding our decision.
>> Cc: Arun KS <>
>> Cc: Andrew Morton <>
>> Cc: Oscar Salvador <>
>> Cc: Michal Hocko <>
>> Cc: Pavel Tatashin <>
>> Cc: Dan Williams <>
>> Signed-off-by: David Hildenbrand <>



David / dhildenb

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