linux-kernel - [PATCH 1/4] task_work: s/task_work_cancel()/task_work_cancel

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Date: Sat, 30 Mar 2024 00:58:09 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Howells <dhowells@...hat.com>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 1/4] task_work: s/task_work_cancel()/task_work_cancel_func()/

A proper task_work_cancel() API that actually cancels a callback and not
*any* callback pointing to a given function is going to be needed for
perf events event freeing. Do the appropriate rename to prepare for
that.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 include/linux/task_work.h |  2 +-
 kernel/irq/manage.c       |  2 +-
 kernel/task_work.c        | 10 +++++-----
 security/keys/keyctl.c    |  2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/task_work.h b/include/linux/task_work.h
index 3564172dbc27..89ee2cbf044b 100644
--- a/include/linux/task_work.h
+++ b/include/linux/task_work.h
@@ -36,7 +36,7 @@ int task_work_add(struct task_struct *task, struct callback_head *twork,
 
 struct callback_head *task_work_cancel_match(struct task_struct *task,
 	bool (*match)(struct callback_head *, void *data), void *data);
-struct callback_head *task_work_cancel(struct task_struct *, task_work_func_t);
+struct callback_head *task_work_cancel_func(struct task_struct *, task_work_func_t);
 void task_work_run(void);
 
 static inline void exit_task_work(struct task_struct *task)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ad3eaf2ab959..2464e98879f3 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1333,7 +1333,7 @@ static int irq_thread(void *data)
 	 * synchronize_hardirq(). So neither IRQTF_RUNTHREAD nor the
 	 * oneshot mask bit can be set.
 	 */
-	task_work_cancel(current, irq_thread_dtor);
+	task_work_cancel_func(current, irq_thread_dtor);
 	return 0;
 }
 
diff --git a/kernel/task_work.c b/kernel/task_work.c
index d283f603d916..c1b4d3ba2590 100644
--- a/kernel/task_work.c
+++ b/kernel/task_work.c
@@ -120,9 +120,9 @@ static bool task_work_func_match(struct callback_head *cb, void *data)
 }
 
 /**
- * task_work_cancel - cancel a pending work added by task_work_add()
- * @task: the task which should execute the work
- * @func: identifies the work to remove
+ * task_work_cancel_func - cancel a pending work matching a function added by task_work_add()
+ * @task: the task which should execute the func's work
+ * @func: identifies the func to match with a work to remove
  *
  * Find the last queued pending work with ->func == @func and remove
  * it from queue.
@@ -131,7 +131,7 @@ static bool task_work_func_match(struct callback_head *cb, void *data)
  * The found work or NULL if not found.
  */
 struct callback_head *
-task_work_cancel(struct task_struct *task, task_work_func_t func)
+task_work_cancel_func(struct task_struct *task, task_work_func_t func)
 {
 	return task_work_cancel_match(task, task_work_func_match, func);
 }
@@ -168,7 +168,7 @@ void task_work_run(void)
 		if (!work)
 			break;
 		/*
-		 * Synchronize with task_work_cancel(). It can not remove
+		 * Synchronize with task_work_cancel_match(). It can not remove
 		 * the first entry == work, cmpxchg(task_works) must fail.
 		 * But it can remove another entry from the ->next list.
 		 */
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 10ba439968f7..3aff32a2bcf3 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1693,7 +1693,7 @@ long keyctl_session_to_parent(void)
 		goto unlock;
 
 	/* cancel an already pending keyring replacement */
-	oldwork = task_work_cancel(parent, key_change_session_keyring);
+	oldwork = task_work_cancel_func(parent, key_change_session_keyring);
 
 	/* the replacement session keyring is applied just prior to userspace
 	 * restarting */
-- 
2.44.0