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cgroup: Remove unused cgroup_subsys::post_attach 

cgroup_subsys::post_attach callback was introduced in commit 5cf1cacb49
("cgroup, cpuset: replace cpuset_post_attach_flush() with
cgroup_subsys->post_attach callback") and only cpuset would use this
callback to wait for the mm migration to complete at the end of
__cgroup_procs_write(). Since the previous patch defer the flush operation
until returning to userspace, no one use this callback now. Remove this
callback from cgroup_subsys.

Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chuyi Zhou 2025-09-04 15:45:05 +08:00 committed by Tejun Heo
parent 3514309e03
commit d8b269e009
2 changed files with 0 additions and 5 deletions
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1
include/linux/cgroup-defs.h
View File

@ -763,7 +763,6 @@ struct cgroup_subsys {
int (*can_attach)(struct cgroup_taskset *tset); int (*can_attach)(struct cgroup_taskset *tset);
void (*cancel_attach)(struct cgroup_taskset *tset); void (*cancel_attach)(struct cgroup_taskset *tset);
void (*attach)(struct cgroup_taskset *tset); void (*attach)(struct cgroup_taskset *tset);
void (*post_attach)(void);
int (*can_fork)(struct task_struct *task, int (*can_fork)(struct task_struct *task,
struct css_set *cset); struct css_set *cset);
void (*cancel_fork)(struct task_struct *task, struct css_set *cset); void (*cancel_fork)(struct task_struct *task, struct css_set *cset);

4
kernel/cgroup/cgroup.c
View File

@ -3033,10 +3033,6 @@ void cgroup_procs_write_finish(struct task_struct *task, bool threadgroup_locked
put_task_struct(task); put_task_struct(task);
cgroup_attach_unlock(threadgroup_locked); cgroup_attach_unlock(threadgroup_locked);
for_each_subsys(ss, ssid)
if (ss->post_attach)
ss->post_attach();
} }
static void cgroup_print_ss_mask(struct seq_file *seq, u16 ss_mask) static void cgroup_print_ss_mask(struct seq_file *seq, u16 ss_mask)