linux-kernel - Re: [PATCH v1 2/4] mm/memory_hotplug: Handle unaligned start and nr_pages in online_pages

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Date:   Fri, 9 Aug 2019 14:46:02 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Arun KS <arunks@...eaurora.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH v1 2/4] mm/memory_hotplug: Handle unaligned start and
 nr_pages in online_pages_blocks()

On Fri,  9 Aug 2019 14:56:59 +0200 David Hildenbrand <david@...hat.com> 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@...eaurora.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Pavel Tatashin <pasha.tatashin@...een.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: David Hildenbrand <david@...hat.com>