[PATCH] MAINTAINERS: add Muchun as co-maintainer for HugeTLB

[Muchun Song <songmuchun@bytedance.com>]

I have been focusing on mm for the past two years. e.g. developing,
fixing bugs, reviewing related to HugeTLB system.  I would like to
help Mike and other people working on HugeTLB by reviewing their
work.

When I fist introduced the vmemmmap reduction, I forgot to update
MAINTAINERS file.  Let's update it as well.  And rename "HUGETLB
FILESYSTEM" to "HUGETLB SUBSYSTEM" since some files are not only
related to filesystem but also memory management (the name of
FILESYSTEM cannot cover this area).

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
 MAINTAINERS | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 6516f9c6d28e..904657ffdcd8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9087,16 +9087,20 @@ S:	Orphan
 F:	Documentation/networking/device_drivers/ethernet/huawei/hinic.rst
 F:	drivers/net/ethernet/huawei/hinic/
 
-HUGETLB FILESYSTEM
+HUGETLB SUBSYSTEM
 M:	Mike Kravetz <mike.kravetz@oracle.com>
+M:	Muchun Song <songmuchun@bytedance.com>
 L:	linux-mm@kvack.org
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-kernel-mm-hugepages
 F:	Documentation/admin-guide/mm/hugetlbpage.rst
 F:	Documentation/vm/hugetlbfs_reserv.rst
+F:	Documentation/vm/vmemmap_dedup.rst
 F:	fs/hugetlbfs/
 F:	include/linux/hugetlb.h
 F:	mm/hugetlb.c
+F:	mm/hugetlb_vmemmap.c
+F:	mm/hugetlb_vmemmap.h
 
 HVA ST MEDIA DRIVER
 M:	Jean-Christophe Trotin <jean-christophe.trotin@foss.st.com>
-- 
2.11.0