MAINTAINERS: Separate out sched_ext tree

MAINTAINERS

@@ -19626,8 +19626,6 @@ R:	Ben Segall <[email protected]> (CONFIG_CFS_BANDWIDTH)
 R:	Mel Gorman <[email protected]> (CONFIG_NUMA_BALANCING)
 R:	Daniel Bristot de Oliveira <[email protected]> (SCHED_DEADLINE)
 R:	Valentin Schneider <[email protected]> (TOPOLOGY)
-R:	Tejun Heo <[email protected]> (SCHED_EXT)
-R:	David Vernet <[email protected]> (SCHED_EXT)
 L:	[email protected]
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
@@ -19636,7 +19634,18 @@ F:	include/linux/sched.h
 F:	include/linux/wait.h
 F:	include/uapi/linux/sched.h
 F:	kernel/sched/
+
+SCHEDULER - SCHED_EXT
+R:	Tejun Heo <[email protected]>
+R:	David Vernet <[email protected]>
+L:	[email protected]
+S:	Maintained
+T:	git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git
+F:	include/linux/sched/ext.h
+F:	kernel/sched/ext.h
+F:	kernel/sched/ext.c
 F:	tools/sched_ext/
+F:	tools/testing/selftests/sched_ext
 
 SCSI LIBSAS SUBSYSTEM
 R:	John Garry <[email protected]>