+ linux-kthreadh-remove-unused-macros.patch added to -mm tree

+ linux-kthreadh-remove-unused-macros.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: linux/kthread.h: remove unused macros
has been added to the -mm tree.  Its filename is
     linux-kthreadh-remove-unused-macros.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/linux-kthreadh-remove-unused-macros.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/linux-kthreadh-remove-unused-macros.patch

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------------------------------------------------------
From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
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@rasmusvillemoes.dk
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Yafang Shao <laoar.shao@gmail.com>
Cc: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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);
 
_

Patches currently in -mm which might be from linux@rasmusvillemoes.dk are

linux-kthreadh-remove-unused-macros.patch
include-drop-pointless-__compiler_offsetof-indirection.patch