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exit: Remove profile_handoff_task 

All profile_handoff_task does is notify the task_free_notifier chain.
The helpers task_handoff_register and task_handoff_unregister are used
to add and delete entries from that chain and are never called.

So remove the dead code and make it much easier to read and reason
about __put_task_struct.

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lkml.kernel.org/r/87fspyw6m0.fsf@email.froward.int.ebiederm.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2022-01-08 10:03:24 -06:00
parent 2d4bcf886e
commit 2873cd31a2
3 changed files with 1 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/linux/profile.h
View File

@ -61,14 +61,6 @@ static inline void profile_hit(int type, void *ip)
struct task_struct;
struct mm_struct;
/* task is dead, free task struct ? Returns 1 if
* the task was taken, 0 if the task should be freed.
*/
int profile_handoff_task(struct task_struct * task);
int task_handoff_register(struct notifier_block * n);
int task_handoff_unregister(struct notifier_block * n);
#else
#define prof_on 0
@ -93,17 +85,6 @@ static inline void profile_hit(int type, void *ip)
return;
}
static inline int task_handoff_register(struct notifier_block * n)
{
return -ENOSYS;
}
static inline int task_handoff_unregister(struct notifier_block * n)
{
return -ENOSYS;
}
#define profile_handoff_task(a) (0)
#endif /* CONFIG_PROFILING */

4
kernel/fork.c
View File

@ -754,9 +754,7 @@ void __put_task_struct(struct task_struct *tsk)
delayacct_tsk_free(tsk);
put_signal_struct(tsk->signal);
sched_core_free(tsk);
if (!profile_handoff_task(tsk))
free_task(tsk);
free_task(tsk);
}
EXPORT_SYMBOL_GPL(__put_task_struct);

23
kernel/profile.c
View File

@ -133,29 +133,6 @@ int __ref profile_init(void)
return -ENOMEM;
}
/* Profile event notifications */
static ATOMIC_NOTIFIER_HEAD(task_free_notifier);
int profile_handoff_task(struct task_struct *task)
{
int ret;
ret = atomic_notifier_call_chain(&task_free_notifier, 0, task);
return (ret == NOTIFY_OK) ? 1 : 0;
}
int task_handoff_register(struct notifier_block *n)
{
return atomic_notifier_chain_register(&task_free_notifier, n);
}
EXPORT_SYMBOL_GPL(task_handoff_register);
int task_handoff_unregister(struct notifier_block *n)
{
return atomic_notifier_chain_unregister(&task_free_notifier, n);
}
EXPORT_SYMBOL_GPL(task_handoff_unregister);
#if defined(CONFIG_SMP) && defined(CONFIG_PROC_FS)
/*
* Each cpu has a pair of open-addressed hashtables for pending