[PATCH -tip 24/32] sched: Release references to the per-task cookie on exit

[Joel Fernandes (Google)]

During exit, we have to free the references to a cookie that might be shared by
many tasks. This commit therefore ensures when the task_struct is released, any
references to cookies that it holds are also released.

Reviewed-by: Chris Hyser <chris.hy...@oracle.com>
Tested-by: Julien Desfossez <jdesfos...@digitalocean.com>
Signed-off-by: Joel Fernandes (Google) <j...@joelfernandes.org>
---
 include/linux/sched.h | 3 +++
 kernel/fork.c         | 1 +
 kernel/sched/core.c   | 8 ++++++++
 3 files changed, 12 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 79d76c78cc8e..6fbdb1a204bf 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2084,11 +2084,14 @@ void sched_core_unsafe_exit(void);
 bool sched_core_wait_till_safe(unsigned long ti_check);
 bool sched_core_kernel_protected(void);
 int sched_core_share_pid(pid_t pid);
+void sched_tsk_free(struct task_struct *tsk);
 #else
 #define sched_core_unsafe_enter(ignore) do { } while (0)
 #define sched_core_unsafe_exit(ignore) do { } while (0)
 #define sched_core_wait_till_safe(ignore) do { } while (0)
 #define sched_core_kernel_protected(ignore) do { } while (0)
+#define sched_core_share_pid(pid) do { } while (0)
+#define sched_tsk_free(tsk) do { } while (0)
 #endif
 
 #endif
diff --git a/kernel/fork.c b/kernel/fork.c
index 7199d359690c..5468c93829c5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -736,6 +736,7 @@ void __put_task_struct(struct task_struct *tsk)
        exit_creds(tsk);
        delayacct_tsk_free(tsk);
        put_signal_struct(tsk->signal);
+       sched_tsk_free(tsk);
 
        if (!profile_handoff_task(tsk))
                free_task(tsk);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a95898c75bdf..cc36c384364e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -10066,6 +10066,14 @@ static int cpu_core_tag_write_u64(struct 
cgroup_subsys_state *css, struct cftype
 
        return 0;
 }
+
+void sched_tsk_free(struct task_struct *tsk)
+{
+       if (!tsk->core_task_cookie)
+               return;
+       sched_core_put_task_cookie(tsk->core_task_cookie);
+       sched_core_put();
+}
 #endif
 
 static struct cftype cpu_legacy_files[] = {
-- 
2.29.2.299.gdc1121823c-goog