linux-kernel - [PATCH v4 0/8] mm: Use hotplug_memory_notifier() instead of register_hotmemory

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Date:   Fri, 23 Sep 2022 11:33:39 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Waiman Long <longman@...hat.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Christoph Lameter <cl@...ux.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Liu Shixin <liushixin2@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v4 0/8] mm: Use hotplug_memory_notifier() instead of register_hotmemory_notifier()

Patch f02c69680088 introduced register_hotmemory_notifier() to avoid a
compile problem with gcc-4.4.4:

    When CONFIG_MEMORY_HOTPLUG=n, we don't want the memory-hotplug notifier
    handlers to be included in the .o files, for space reasons.

    The existing hotplug_memory_notifier() tries to handle this but testing
    with gcc-4.4.4 shows that it doesn't work - the hotplug functions are
    still present in the .o files.

Since patch 316346243be6 has already updated the minimum gcc version to 5.1.
The previous problem mentioned in patch f02c69680088 is not existed. So we
can now revert to use hotplug_memory_notifier() directly rather than
register_hotmemory_notifier().

In the last patch, we move all hotplug memory notifier priority to same
file for easy sorting.

Patch [1-6] replace register_hotmemory_notifier() with hotplug_memory_notifier()
for every caller.
Patch [7] remove unused register_hotmemory_notifier().
Patch [8] move all priority of hotplug memory callback into include/linux/memory.h
for easy sorting.

v3->v4: Add back the missed Reviewed-by from v2 according to David's reminder.
v2->v3: fold last two patches, change MM_BATCH_CALLBACK_PRI to
MM_COMPUTE_BATCH_PRI and rewrite the commit log.
v1->v2: fix compile error of patch [4,5].

Liu Shixin (8):
  cgroup/cpuset: use hotplug_memory_notifier() directly
  fs/proc/kcore.c: use hotplug_memory_notifier() directly
  mm/slub.c: use hotplug_memory_notifier() directly
  mm/mmap: use hotplug_memory_notifier() directly
  mm/mm_init.c: use hotplug_memory_notifier() directly
  ACPI: HMAT: use hotplug_memory_notifier() directly
  memory: remove unused register_hotmemory_notifier()
  memory: move hotplug memory notifier priority to same file for easy
    sorting

 drivers/acpi/numa/hmat.c     |  7 +------
 fs/proc/kcore.c              |  7 +------
 include/linux/memory-tiers.h |  1 -
 include/linux/memory.h       | 15 +++++++--------
 kernel/cgroup/cpuset.c       |  7 +------
 mm/kasan/shadow.c            |  2 +-
 mm/ksm.c                     |  2 +-
 mm/memory-tiers.c            |  2 +-
 mm/mm_init.c                 |  8 +-------
 mm/mmap.c                    |  6 +-----
 mm/page_ext.c                |  2 +-
 mm/slub.c                    |  7 +------
 12 files changed, 17 insertions(+), 49 deletions(-)

-- 
2.25.1