linux-kernel - [PATCH] workqueue: Introduce from_wq() helper for cleaner callback declarations

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Date: Tue, 27 Feb 2024 18:56:28 +0000
From: Allen Pais <apais@...ux.microsoft.com>
To: tj@...nel.org
Cc: jiangshanlai@...il.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] workqueue: Introduce from_wq() helper for cleaner callback declarations

To streamline the transition from tasklets to worqueues, a new helper
function, from_wq(), is introduced. This helper, inspired by existing
from_() patterns, utilizes container_of() and eliminates the redundancy
of declaring variable types, leading to more concise and readable code.

The modified code snippet demonstrates the enhanced clarity achieved
with from_wq():

  void callback(struct work_struct *w)
   {
     - struct some_data_structure *local = container_of(w,
						       struct some_data_structure,
						       work);
     + struct some_data_structure *local = from_wq(local, w, work);

This change aims to facilitate a smoother transition and uphold code
quality standards.

Based on:
  git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git disable_work-v3

Signed-off-by: Allen Pais <allen.lkml@...il.com>
---
 include/linux/workqueue.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 7710cd52f7f0..aa61009c6fd6 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -527,6 +527,9 @@ alloc_workqueue(const char *fmt, unsigned int flags, int max_active, ...);
 #define create_singlethread_workqueue(name)				\
 	alloc_ordered_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, name)
 
+#define from_wq(var, callback_work, work_fieldname)	\
+	container_of(callback_work, typeof(*var), work_fieldname)
+
 extern void destroy_workqueue(struct workqueue_struct *wq);
 
 struct workqueue_attrs *alloc_workqueue_attrs(void);
-- 
2.17.1