From: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Subject: linux/kthread.h: remove unused macros
Ever since these macros were introduced in commit b56c0d8937e6 ("kthread:
implement kthread_worker"), there has been precisely one user (commit
4d115420707a, "NVMe: Async IO queue deletion"), and that user went away in
2016 with db3cbfff5bcc ("NVMe: IO queue deletion re-write").
Apart from being unused, these macros are also awkward to use (which may
contribute to them not being used): Having a way to statically (or
on-stack) allocating the storage for the struct kthread_worker itself
doesn't help much, since obviously one needs to have some code for
actually _spawning_ the worker thread, which must have error checking.
And these days we have the kthread_create_worker() interface which both
allocates the struct kthread_worker and spawns the kthread.
Link: https://lkml.kernel.org/r/20220314145343.494694-1-linux@xxxxxxxxxxxxxxxxxx
Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Yafang Shao <laoar.shao@xxxxxxxxx>
Cc: Cai Huoqing <caihuoqing@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kthread.h | 22 ----------------------
1 file changed, 22 deletions(-)
--- a/include/linux/kthread.h~linux-kthreadh-remove-unused-macros
+++ a/include/linux/kthread.h
@@ -141,12 +141,6 @@ struct kthread_delayed_work {
struct timer_list timer;
};
-#define KTHREAD_WORKER_INIT(worker) { \
- .lock = __RAW_SPIN_LOCK_UNLOCKED((worker).lock), \
- .work_list = LIST_HEAD_INIT((worker).work_list), \
- .delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\
- }
-
#define KTHREAD_WORK_INIT(work, fn) { \
.node = LIST_HEAD_INIT((work).node), \
.func = (fn), \
@@ -158,9 +152,6 @@ struct kthread_delayed_work {
TIMER_IRQSAFE), \
}
-#define DEFINE_KTHREAD_WORKER(worker) \
- struct kthread_worker worker = KTHREAD_WORKER_INIT(worker)
-
#define DEFINE_KTHREAD_WORK(work, fn) \
struct kthread_work work = KTHREAD_WORK_INIT(work, fn)
@@ -168,19 +159,6 @@ struct kthread_delayed_work {
struct kthread_delayed_work dwork = \
KTHREAD_DELAYED_WORK_INIT(dwork, fn)
-/*
- * kthread_worker.lock needs its own lockdep class key when defined on
- * stack with lockdep enabled. Use the following macros in such cases.
- */
-#ifdef CONFIG_LOCKDEP
-# define KTHREAD_WORKER_INIT_ONSTACK(worker) \
- ({ kthread_init_worker(&worker); worker; })
-# define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \
- struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker)
-#else
-# define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker)
-#endif
-
extern void __kthread_init_worker(struct kthread_worker *worker,
const char *name, struct lock_class_key *key);
_
