On 8/3/24 02:16, Xiu Jianfeng wrote:
From: Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>
According to the implement of cgroup_css_set_fork() and the usage in
"implementation"?
the cpuset controller which also has .can_fork and .cancel_fork hooks,
the argument 'cset' for these two hooks must not be NULL, so remove
the unrechable paths in thse two hooks.
It is primarily due to cgroup_css_set_fork() will fail if cset cannot be
found and the can_fork/cancel_fork method will not be called in this case.
Cheers,
Longman
Signed-off-by: Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>
---
kernel/cgroup/pids.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/kernel/cgroup/pids.c b/kernel/cgroup/pids.c
index 34aa63d7c9c6..8f61114c36dd 100644
--- a/kernel/cgroup/pids.c
+++ b/kernel/cgroup/pids.c
@@ -272,15 +272,10 @@ static void pids_event(struct pids_cgroup *pids_forking,
*/
static int pids_can_fork(struct task_struct *task, struct css_set *cset)
{
- struct cgroup_subsys_state *css;
struct pids_cgroup *pids, *pids_over_limit;
int err;
- if (cset)
- css = cset->subsys[pids_cgrp_id];
- else
- css = task_css_check(current, pids_cgrp_id, true);
- pids = css_pids(css);
+ pids = css_pids(cset->subsys[pids_cgrp_id]);
err = pids_try_charge(pids, 1, &pids_over_limit);
if (err)
pids_event(pids, pids_over_limit);
@@ -290,14 +285,9 @@ static int pids_can_fork(struct task_struct *task, struct css_set *cset)
static void pids_cancel_fork(struct task_struct *task, struct css_set *cset)
{
- struct cgroup_subsys_state *css;
struct pids_cgroup *pids;
- if (cset)
- css = cset->subsys[pids_cgrp_id];
- else
- css = task_css_check(current, pids_cgrp_id, true);
- pids = css_pids(css);
+ pids = css_pids(cset->subsys[pids_cgrp_id]);
pids_uncharge(pids, 1);
}
