linux-kernel - [PATCH v2 1/2] workqueue: Add initialization macro for work items that disabled by default

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Message-Id: <20251001102341.600251-1-pengyu@kylinos.cn>
Date: Wed,  1 Oct 2025 18:23:40 +0800
From: pengyu <pengyu@...inos.cn>
To: tj@...nel.org,
	jiangshanlai@...il.com,
	oliver.sang@...el.com
Cc: changlianzhi@...ontech.com,
	dmitry.torokhov@...il.com,
	gregkh@...uxfoundation.org,
	jirislaby@...nel.org,
	legion@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	lkp@...el.com,
	mingo@...nel.org,
	myrrhperiwinkle@...labs.xyz,
	oe-lkp@...ts.linux.dev,
	pengyu@...inos.cn,
	syzbot+79c403850e6816dc39cf@...kaller.appspotmail.com,
	tglx@...utronix.de
Subject: [PATCH v2 1/2] workqueue: Add initialization macro for work items that disabled by default

In certain scenarios, workqueue tasks that are disabled by default are
required. Similar to DECLARE_TASKLET_DISABLED, the DECLARE_WORK_DISABLED
macro is added to achieve this functionality.

Signed-off-by: pengyu <pengyu@...inos.cn>
---
 include/linux/workqueue.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 45d5dd470ff6..b6c72d59351b 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -102,6 +102,7 @@ enum wq_misc_consts {
 /* Convenience constants - of type 'unsigned long', not 'enum'! */
 #define WORK_OFFQ_BH		(1ul << WORK_OFFQ_BH_BIT)
 #define WORK_OFFQ_FLAG_MASK	(((1ul << WORK_OFFQ_FLAG_BITS) - 1) << WORK_OFFQ_FLAG_SHIFT)
+#define WORK_OFFQ_DISABLED	(1ul  << WORK_OFFQ_DISABLE_SHIFT)
 #define WORK_OFFQ_DISABLE_MASK	(((1ul << WORK_OFFQ_DISABLE_BITS) - 1) << WORK_OFFQ_DISABLE_SHIFT)
 #define WORK_OFFQ_POOL_NONE	((1ul << WORK_OFFQ_POOL_BITS) - 1)
 #define WORK_STRUCT_NO_POOL	(WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT)
@@ -110,6 +111,8 @@ enum wq_misc_consts {
 #define WORK_DATA_INIT()	ATOMIC_LONG_INIT((unsigned long)WORK_STRUCT_NO_POOL)
 #define WORK_DATA_STATIC_INIT()	\
 	ATOMIC_LONG_INIT((unsigned long)(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC))
+#define WORK_DATA_DISABLED_INIT()	\
+		ATOMIC_LONG_INIT((unsigned long)(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC | WORK_OFFQ_DISABLED))
 
 struct delayed_work {
 	struct work_struct work;
@@ -242,6 +245,13 @@ struct execute_work {
 	__WORK_INIT_LOCKDEP_MAP(#n, &(n))				\
 	}
 
+#define __WORK_DISABLED_INITIALIZER(n, f) {					\
+	.data = WORK_DATA_DISABLED_INIT(),				\
+	.entry	= { &(n).entry, &(n).entry },				\
+	.func = (f),							\
+	__WORK_INIT_LOCKDEP_MAP(#n, &(n))				\
+	}
+
 #define __DELAYED_WORK_INITIALIZER(n, f, tflags) {			\
 	.work = __WORK_INITIALIZER((n).work, (f)),			\
 	.timer = __TIMER_INITIALIZER(delayed_work_timer_fn,\
@@ -251,6 +261,9 @@ struct execute_work {
 #define DECLARE_WORK(n, f)						\
 	struct work_struct n = __WORK_INITIALIZER(n, f)
 
+#define DECLARE_WORK_DISABLED(n, f)						\
+	struct work_struct n = __WORK_DISABLED_INITIALIZER(n, f)
+
 #define DECLARE_DELAYED_WORK(n, f)					\
 	struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f, 0)
 
-- 
2.25.1