MAINTAINERS: fixup USERFAULTFD entry

Patch series "MAINTAINERS: add my isub-entries to MM part."

Following discussion at LSF/MM/BPF I'm adding execmem, secretmem and
numa memblocks sub-entries for MEMORY MANAGEMENT in MAINTAINERS.


This patch (of 4):

Change title to "MEMORY MANAGEMENT - USERFAULTFD" and make it sub-topic in
memory management and add missing include/linux/userfaultfd_k.h and
mailing list

Link: https://lkml.kernel.org/r/20250326215541.1809379-1-rppt@kernel.org
Link: https://lkml.kernel.org/r/20250326215541.1809379-2-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Dan Willaims <dan.j.williams@intel.com>
Cc: "Mike Rapoport (IBM)" <rppt@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: rppt

MAINTAINERS

@@ -15497,6 +15497,19 @@ F:	tools/mm/
 F:	tools/testing/selftests/mm/
 N:	include/linux/page[-_]*
 
+MEMORY MANAGEMENT - USERFAULTFD
+M:	Andrew Morton <akpm@linux-foundation.org>
+R:	Peter Xu <peterx@redhat.com>
+L:	linux-mm@kvack.org
+S:	Maintained
+F:	Documentation/admin-guide/mm/userfaultfd.rst
+F:	fs/userfaultfd.c
+F:	include/asm-generic/pgtable_uffd.h
+F:	include/linux/userfaultfd_k.h
+F:	include/uapi/linux/userfaultfd.h
+F:	mm/userfaultfd.c
+F:	tools/testing/selftests/mm/uffd-*.[ch]
+
 MEMORY MAPPING
 M:	Andrew Morton <akpm@linux-foundation.org>
 M:	Liam R. Howlett <Liam.Howlett@oracle.com>
@@ -15517,18 +15530,6 @@ F:	mm/vma.h
 F:	mm/vma_internal.h
 F:	tools/testing/vma/
 
-MEMORY USERFAULTFD
-M:	Andrew Morton <akpm@linux-foundation.org>
-R:	Peter Xu <peterx@redhat.com>
-S:	Maintained
-F:	Documentation/admin-guide/mm/userfaultfd.rst
-F:	fs/userfaultfd.c
-F:	include/asm-generic/pgtable_uffd.h
-F:	include/linux/userfaultfd_k.h
-F:	include/uapi/linux/userfaultfd.h
-F:	mm/userfaultfd.c
-F:	tools/testing/selftests/mm/uffd-*.[ch]
-
 MEMORY TECHNOLOGY DEVICES (MTD)
 M:	Miquel Raynal <miquel.raynal@bootlin.com>
 M:	Richard Weinberger <richard@nod.at>