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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/include/linux/workqueue.h
....@@ -63,7 +63,7 @@
6363 	WORK_CPU_UNBOUND	= NR_CPUS,
6464 
6565 	/*
66
-	 * Reserve 7 bits off of pwq pointer w/ debugobjects turned off.
66
+	 * Reserve 8 bits off of pwq pointer w/ debugobjects turned off.
6767 	 * This makes pwqs aligned to 256 bytes and allows 15 workqueue
6868 	 * flush colors.
6969 	 */
....@@ -74,7 +74,6 @@
7474 	WORK_OFFQ_FLAG_BASE	= WORK_STRUCT_COLOR_SHIFT,
7575 
7676 	__WORK_OFFQ_CANCELING	= WORK_OFFQ_FLAG_BASE,
77
-	WORK_OFFQ_CANCELING	= (1 << __WORK_OFFQ_CANCELING),
7877 
7978 	/*
8079 	 * When a work item is off queue, its high bits point to the last
....@@ -85,12 +84,6 @@
8584 	WORK_OFFQ_POOL_SHIFT	= WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS,
8685 	WORK_OFFQ_LEFT		= BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
8786 	WORK_OFFQ_POOL_BITS	= WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
88
-	WORK_OFFQ_POOL_NONE	= (1LU << WORK_OFFQ_POOL_BITS) - 1,
89
-
90
-	/* convenience constants */
91
-	WORK_STRUCT_FLAG_MASK	= (1UL << WORK_STRUCT_FLAG_BITS) - 1,
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-	WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
93
-	WORK_STRUCT_NO_POOL	= (unsigned long)WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT,
9487 
9588 	/* bit mask for work_busy() return values */
9689 	WORK_BUSY_PENDING	= 1 << 0,
....@@ -99,6 +92,14 @@
9992 	/* maximum string length for set_worker_desc() */
10093 	WORKER_DESC_LEN		= 24,
10194 };
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+
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+/* Convenience constants - of type 'unsigned long', not 'enum'! */
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+#define WORK_OFFQ_CANCELING	(1ul << __WORK_OFFQ_CANCELING)
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+#define WORK_OFFQ_POOL_NONE	((1ul << WORK_OFFQ_POOL_BITS) - 1)
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+#define WORK_STRUCT_NO_POOL	(WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT)
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+
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+#define WORK_STRUCT_FLAG_MASK    ((1ul << WORK_STRUCT_FLAG_BITS) - 1)
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+#define WORK_STRUCT_WQ_DATA_MASK (~WORK_STRUCT_FLAG_MASK)
102103 
103104 struct work_struct {
104105 	atomic_long_t data;
....@@ -396,43 +397,23 @@
396397 extern struct workqueue_struct *system_power_efficient_wq;
397398 extern struct workqueue_struct *system_freezable_power_efficient_wq;
398399 
399
-extern struct workqueue_struct *
400
-__alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
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-	struct lock_class_key *key, const char *lock_name, ...) __printf(1, 6);
402
-
403400 /**
404401  * alloc_workqueue - allocate a workqueue
405402  * @fmt: printf format for the name of the workqueue
406403  * @flags: WQ_* flags
407404  * @max_active: max in-flight work items, 0 for default
408
- * @args...: args for @fmt
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+ * remaining args: args for @fmt
409406  *
410407  * Allocate a workqueue with the specified parameters.  For detailed
411408  * information on WQ_* flags, please refer to
412409  * Documentation/core-api/workqueue.rst.
413410  *
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- * The __lock_name macro dance is to guarantee that single lock_class_key
415
- * doesn't end up with different namesm, which isn't allowed by lockdep.
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- *
417411  * RETURNS:
418412  * Pointer to the allocated workqueue on success, %NULL on failure.
419413  */
420
-#ifdef CONFIG_LOCKDEP
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-#define alloc_workqueue(fmt, flags, max_active, args...)		\
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-({									\
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-	static struct lock_class_key __key;				\
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-	const char *__lock_name;					\
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-									\
426
-	__lock_name = "(wq_completion)"#fmt#args;			\
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-									\
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-	__alloc_workqueue_key((fmt), (flags), (max_active),		\
429
-			      &__key, __lock_name, ##args);		\
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-})
431
-#else
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-#define alloc_workqueue(fmt, flags, max_active, args...)		\
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-	__alloc_workqueue_key((fmt), (flags), (max_active),		\
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-			      NULL, NULL, ##args)
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-#endif
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+struct workqueue_struct *alloc_workqueue(const char *fmt,
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+					 unsigned int flags,
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+					 int max_active, ...);
436417 
437418 /**
438419  * alloc_ordered_workqueue - allocate an ordered workqueue
....@@ -461,10 +442,16 @@
461442 
462443 extern void destroy_workqueue(struct workqueue_struct *wq);
463444 
445
+struct workqueue_attrs *alloc_workqueue_attrs(void);
446
+void free_workqueue_attrs(struct workqueue_attrs *attrs);
447
+int apply_workqueue_attrs(struct workqueue_struct *wq,
448
+			  const struct workqueue_attrs *attrs);
464449 int workqueue_set_unbound_cpumask(cpumask_var_t cpumask);
465450 
466451 extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
467452 			struct work_struct *work);
453
+extern bool queue_work_node(int node, struct workqueue_struct *wq,
454
+			    struct work_struct *work);
468455 extern bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
469456 			struct delayed_work *work, unsigned long delay);
470457 extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
....@@ -507,6 +494,19 @@
507494  *
508495  * We queue the work to the CPU on which it was submitted, but if the CPU dies
509496  * it can be processed by another CPU.
497
+ *
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+ * Memory-ordering properties:  If it returns %true, guarantees that all stores
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+ * preceding the call to queue_work() in the program order will be visible from
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+ * the CPU which will execute @work by the time such work executes, e.g.,
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+ *
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+ * { x is initially 0 }
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+ *
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+ *   CPU0				CPU1
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+ *
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+ *   WRITE_ONCE(x, 1);			[ @work is being executed ]
507
+ *   r0 = queue_work(wq, work);		  r1 = READ_ONCE(x);
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+ *
509
+ * Forbids: r0 == true && r1 == 0
510510  */
511511 static inline bool queue_work(struct workqueue_struct *wq,
512512 			      struct work_struct *work)
....@@ -566,6 +566,9 @@
566566  * This puts a job in the kernel-global workqueue if it was not already
567567  * queued and leaves it in the same position on the kernel-global
568568  * workqueue otherwise.
569
+ *
570
+ * Shares the same memory-ordering properties of queue_work(), cf. the
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+ * DocBook header of queue_work().
569572  */
570573 static inline bool schedule_work(struct work_struct *work)
571574 {
....@@ -669,7 +672,7 @@
669672 int workqueue_offline_cpu(unsigned int cpu);
670673 #endif
671674 
672
-int __init workqueue_init_early(void);
673
-int __init workqueue_init(void);
675
+void __init workqueue_init_early(void);
676
+void __init workqueue_init(void);
674677 
675678 #endif