Re: [PATCH v1 2/4] mm/memory_hotplug: Handle unaligned start and nr_pages in online_pages_blocks()

[Andrew Morton]

On Fri,  9 Aug 2019 14:56:59 +0200 David Hildenbrand <david@xxxxxxxxxx> 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.

> 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 <arunks@xxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Oscar Salvador <osalvador@xxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>