MAINTAINERS: add mm ksm section

As part of the ongoing efforts to sub-divide memory management
maintainership and reviewership, establish a section for Kernel Samepage
Merging (KSM) and add appropriate maintainers and reviewers.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lorenzo Stoakes <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: Chengming Zhou <[email protected]>
Acked-by: Xu Xin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: lorenzo-stoakes

MAINTAINERS

@@ -15562,6 +15562,21 @@ W:	http://www.linux-mm.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
 F:	mm/gup.c
 
+MEMORY MANAGEMENT - KSM (Kernel Samepage Merging)
+M:	Andrew Morton <[email protected]>
+M:	David Hildenbrand <[email protected]>
+R:	Xu Xin <[email protected]>
+R:	Chengming Zhou <[email protected]>
+L:	[email protected]
+S:	Maintained
+W:	http://www.linux-mm.org
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
+F:	Documentation/admin-guide/mm/ksm.rst
+F:	Documentation/mm/ksm.rst
+F:	include/linux/ksm.h
+F:	include/trace/events/ksm.h
+F:	mm/ksm.c
+
 MEMORY MANAGEMENT - NUMA MEMBLOCKS AND NUMA EMULATION
 M:	Andrew Morton <[email protected]>
 M:	Mike Rapoport <[email protected]>