cgroup: remove struct cgroup_scanner

cgroup_scan_tasks() takes a pointer to struct cgroup_scanner as its
sole argument and the only function of that struct is packing the
arguments of the function call which are consisted of five fields.
It's not too unusual to pack parameters into a struct when the number
of arguments gets excessive or the whole set needs to be passed around
a lot, but neither holds here making it just weird.

Drop struct cgroup_scanner and pass the params directly to
cgroup_scan_tasks().  Note that struct cpuset_change_nodemask_arg was
added to cpuset.c to pass both ->cs and ->newmems pointer to
cpuset_change_nodemask() using single data pointer.

This doesn't make any functional differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

1 files changed, 6 insertions, 10 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 0287fccd0f54..8472ed576b64 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -528,15 +528,6 @@ struct cftype_set {
 	struct cftype			*cfts;
 };
 
-struct cgroup_scanner {
-	struct cgroup *cgrp;
-	int (*test_task)(struct task_struct *p, struct cgroup_scanner *scan);
-	void (*process_task)(struct task_struct *p,
-			struct cgroup_scanner *scan);
-	struct ptr_heap *heap;
-	void *data;
-};
-
 /*
  * See the comment above CGRP_ROOT_SANE_BEHAVIOR for details.  This
  * function can be called as long as @cgrp is accessible.
@@ -899,7 +890,12 @@ struct cgroup_task_iter {
 void cgroup_task_iter_start(struct cgroup *cgrp, struct cgroup_task_iter *it);
 struct task_struct *cgroup_task_iter_next(struct cgroup_task_iter *it);
 void cgroup_task_iter_end(struct cgroup_task_iter *it);
-int cgroup_scan_tasks(struct cgroup_scanner *scan);
+
+int cgroup_scan_tasks(struct cgroup *cgrp,
+		      bool (*test)(struct task_struct *, void *),
+		      void (*process)(struct task_struct *, void *),
+		      void *data, struct ptr_heap *heap);
+
 int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
 int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);