linux-kernel - Re: [PATCH v8 4/8] mm,memory_hotplug: Allocate memmap from the added memory range

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Message-ID: <YHlpAvTPuRZtKo0i@localhost.localdomain>
Date:   Fri, 16 Apr 2021 12:37:54 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 4/8] mm,memory_hotplug: Allocate memmap from the added
 memory range

On Fri, Apr 16, 2021 at 12:33:34PM +0200, David Hildenbrand wrote:
> IIRC, we have to add the zero shadow first, before touching the memory. This
> is also what mm/memremap.c does.
> 
> In mhp_deinit_memmap_on_memory(), you already remove in the proper
> (reversed) order :)

But looking at online_pages(), we do it after the
move_pfn_range_to_zone(), right? AFAIK (I might be well wrong here),
memory_notify() will eventually call kasan_add_zero_shadow? So that
comes after the move_pfn_range_to_zone? Or is my understanding
incorrect?


-- 
Oscar Salvador
SUSE L3