mm/mmap: use hotplug_memory_notifier() directly

Commit 76ae847497bc52 ("Documentation: raise minimum supported version of
GCC to 5.1") updated the minimum gcc version to 5.1.  So the problem
mentioned in f02c69680088 ("include/linux/memory.h: implement
register_hotmemory_notifier()") no longer exist.  So we can now switch to
use hotplug_memory_notifier() directly rather than
register_hotmemory_notifier().

Link: https://lkml.kernel.org/r/20220923033347.3935160-5-liushixin2@huawei.com
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Waiman Long <longman@redhat.com>
Cc: zefan li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/mmap.c b/mm/mmap.c
index 2def555..3f47fd5 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3749,13 +3749,9 @@ static int reserve_mem_notifier(struct notifier_block *nb,
        return NOTIFY_OK;
 }
 
-static struct notifier_block reserve_mem_nb = {
-       .notifier_call = reserve_mem_notifier,
-};
-
 static int __meminit init_reserve_notifier(void)
 {
-       if (register_hotmemory_notifier(&reserve_mem_nb))
+       if (hotplug_memory_notifier(reserve_mem_notifier, 0))
                pr_err("Failed registering memory add/remove notifier for admin reserve\n");
 
        return 0;