mm: pass meminit_context to __free_pages_core()

Patch series "mm/memory_hotplug: use PageOffline() instead of
PageReserved() for !ZONE_DEVICE".

This can be a considered a long-overdue follow-up to some parts of [1]. 
The patches are based on [2], but they are not strictly required -- just
makes it clearer why we can use adjust_managed_page_count() for memory
hotplug without going into details about highmem.

We stop initializing pages with PageReserved() in memory hotplug code --
except when dealing with ZONE_DEVICE for now.  Instead, we use
PageOffline(): all pages are initialized to PageOffline() when onlining a
memory section, and only the ones actually getting exposed to the
system/page allocator will get PageOffline cleared.

This way, we enlighten memory hotplug more about PageOffline() pages and
can cleanup some hacks we have in virtio-mem code.

What about ZONE_DEVICE?  PageOffline() is wrong, but we might just stop
using PageReserved() for them later by simply checking for
is_zone_device_page() at suitable places.  That will be a separate patch
set / proposal.

This primarily affects virtio-mem, HV-balloon and XEN balloon. I only
briefly tested with virtio-mem, which benefits most from these cleanups.

[1] https://lore.kernel.org/all/[email protected]/
[2] https://lkml.kernel.org/r/[email protected]


This patch (of 3):

In preparation for further changes, let's teach __free_pages_core() about
the differences of memory hotplug handling.

Move the memory hotplug specific handling from generic_online_page() to
__free_pages_core(), use adjust_managed_page_count() on the memory hotplug
path, and spell out why memory freed via memblock cannot currently use
adjust_managed_page_count().

[[email protected]: add missed CONFIG_DEFERRED_STRUCT_PAGE_INIT]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: fix up the memblock comment, per Oscar]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: add the parameter name also in the declaration]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Dexuan Cui <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Eugenio Pérez <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: "K. Y. Srinivasan" <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Mike Rapoport (IBM) <[email protected]>
Cc: Oleksandr Tyshchenko <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: Wei Liu <[email protected]>
Cc: Xuan Zhuo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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