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workqueue: Introduce from_work() helper for cleaner callback declarations 

To streamline the transition from tasklets to worqueues, a new helper
function, from_work(), 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_work(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@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Allen Pais 2024-02-27 19:10:37 +00:00 committed by Tejun Heo
parent ccdec92198
commit 60b2ebf485
1 changed files with 3 additions and 0 deletions
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3
include/linux/workqueue.h
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@ -522,6 +522,9 @@ 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_work(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);