linux-kernel - [PATCH] workqueue: Remove unused work_on_cpu

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Message-ID: <20250623003049.349200-1-linux@treblig.org>
Date: Mon, 23 Jun 2025 01:30:49 +0100
From: linux@...blig.org
To: tj@...nel.org,
	jiangshanlai@...il.com
Cc: ebiggers@...gle.com,
	linux-kernel@...r.kernel.org,
	"Dr. David Alan Gilbert" <linux@...blig.org>
Subject: [PATCH] workqueue: Remove unused work_on_cpu_safe

From: "Dr. David Alan Gilbert" <linux@...blig.org>

The last use of the work_on_cpu_safe() macro was removed recently by
commit 9cda46babdfe ("crypto: n2 - remove Niagara2 SPU driver")

Remove it, and the work_on_cpu_safe_key() function it calls.

Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
---
 include/linux/workqueue.h | 13 -------------
 kernel/workqueue.c        | 25 -------------------------
 2 files changed, 38 deletions(-)

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 6e30f275da77..3bf65b8e14cc 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -840,19 +840,6 @@ long work_on_cpu_key(int cpu, long (*fn)(void *),
 	work_on_cpu_key(_cpu, _fn, _arg, &__key);	\
 })
 
-long work_on_cpu_safe_key(int cpu, long (*fn)(void *),
-			  void *arg, struct lock_class_key *key);
-
-/*
- * A new key is defined for each caller to make sure the work
- * associated with the function doesn't share its locking class.
- */
-#define work_on_cpu_safe(_cpu, _fn, _arg)		\
-({							\
-	static struct lock_class_key __key;		\
-							\
-	work_on_cpu_safe_key(_cpu, _fn, _arg, &__key);	\
-})
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_FREEZER
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 97f37b5bae66..ade5c1152822 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -6770,31 +6770,6 @@ long work_on_cpu_key(int cpu, long (*fn)(void *),
 	return wfc.ret;
 }
 EXPORT_SYMBOL_GPL(work_on_cpu_key);
-
-/**
- * work_on_cpu_safe_key - run a function in thread context on a particular cpu
- * @cpu: the cpu to run on
- * @fn:  the function to run
- * @arg: the function argument
- * @key: The lock class key for lock debugging purposes
- *
- * Disables CPU hotplug and calls work_on_cpu(). The caller must not hold
- * any locks which would prevent @fn from completing.
- *
- * Return: The value @fn returns.
- */
-long work_on_cpu_safe_key(int cpu, long (*fn)(void *),
-			  void *arg, struct lock_class_key *key)
-{
-	long ret = -ENODEV;
-
-	cpus_read_lock();
-	if (cpu_online(cpu))
-		ret = work_on_cpu_key(cpu, fn, arg, key);
-	cpus_read_unlock();
-	return ret;
-}
-EXPORT_SYMBOL_GPL(work_on_cpu_safe_key);
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_FREEZER
-- 
2.49.0