workqueue: Break up enum definitions and give names to the types

workqueue is collecting different sorts of enums into a single unnamed enum
type which can increase confusion around enum width. Also, unnamed enums
can't be accessed from BPF. Let's break up enum definitions according to
their purposes and give them type names.

Signed-off-by: Tejun Heo <tj@kernel.org>

Author: htejun

include/linux/workqueue.h

@@ -22,7 +22,7 @@
  */
 #define work_data_bits(work) ((unsigned long *)(&(work)->data))
 
-enum {
+enum work_bits {
 	WORK_STRUCT_PENDING_BIT	= 0,	/* work item is pending execution */
 	WORK_STRUCT_INACTIVE_BIT= 1,	/* work item is inactive */
 	WORK_STRUCT_PWQ_BIT	= 2,	/* data points to pwq */
@@ -36,21 +36,6 @@ enum {
 
 	WORK_STRUCT_COLOR_BITS	= 4,
 
-	WORK_STRUCT_PENDING	= 1 << WORK_STRUCT_PENDING_BIT,
-	WORK_STRUCT_INACTIVE	= 1 << WORK_STRUCT_INACTIVE_BIT,
-	WORK_STRUCT_PWQ		= 1 << WORK_STRUCT_PWQ_BIT,
-	WORK_STRUCT_LINKED	= 1 << WORK_STRUCT_LINKED_BIT,
-#ifdef CONFIG_DEBUG_OBJECTS_WORK
-	WORK_STRUCT_STATIC	= 1 << WORK_STRUCT_STATIC_BIT,
-#else
-	WORK_STRUCT_STATIC	= 0,
-#endif
-
-	WORK_NR_COLORS		= (1 << WORK_STRUCT_COLOR_BITS),
-
-	/* not bound to any CPU, prefer the local CPU */
-	WORK_CPU_UNBOUND	= NR_CPUS,
-
 	/*
 	 * Reserve 8 bits off of pwq pointer w/ debugobjects turned off.
 	 * This makes pwqs aligned to 256 bytes and allows 16 workqueue
@@ -74,6 +59,26 @@ enum {
 	WORK_OFFQ_LEFT		= BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT,
 	WORK_OFFQ_POOL_BITS	= WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
 
+};
+
+enum work_flags {
+	WORK_STRUCT_PENDING	= 1 << WORK_STRUCT_PENDING_BIT,
+	WORK_STRUCT_INACTIVE	= 1 << WORK_STRUCT_INACTIVE_BIT,
+	WORK_STRUCT_PWQ		= 1 << WORK_STRUCT_PWQ_BIT,
+	WORK_STRUCT_LINKED	= 1 << WORK_STRUCT_LINKED_BIT,
+#ifdef CONFIG_DEBUG_OBJECTS_WORK
+	WORK_STRUCT_STATIC	= 1 << WORK_STRUCT_STATIC_BIT,
+#else
+	WORK_STRUCT_STATIC	= 0,
+#endif
+};
+
+enum wq_misc_consts {
+	WORK_NR_COLORS		= (1 << WORK_STRUCT_COLOR_BITS),
+
+	/* not bound to any CPU, prefer the local CPU */
+	WORK_CPU_UNBOUND	= NR_CPUS,
+
 	/* bit mask for work_busy() return values */
 	WORK_BUSY_PENDING	= 1 << 0,
 	WORK_BUSY_RUNNING	= 1 << 1,
@@ -347,7 +352,7 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
  * Workqueue flags and constants.  For details, please refer to
  * Documentation/core-api/workqueue.rst.
  */
-enum {
+enum wq_flags {
 	WQ_UNBOUND		= 1 << 1, /* not bound to any cpu */
 	WQ_FREEZABLE		= 1 << 2, /* freeze during suspend */
 	WQ_MEM_RECLAIM		= 1 << 3, /* may be used for memory reclaim */
@@ -387,7 +392,9 @@ enum {
 	__WQ_ORDERED		= 1 << 17, /* internal: workqueue is ordered */
 	__WQ_LEGACY		= 1 << 18, /* internal: create*_workqueue() */
 	__WQ_ORDERED_EXPLICIT	= 1 << 19, /* internal: alloc_ordered_workqueue() */
+};
 
+enum wq_consts {
 	WQ_MAX_ACTIVE		= 512,	  /* I like 512, better ideas? */
 	WQ_UNBOUND_MAX_ACTIVE	= WQ_MAX_ACTIVE,
 	WQ_DFL_ACTIVE		= WQ_MAX_ACTIVE / 2,

kernel/workqueue.c

@@ -56,7 +56,7 @@
 
 #include "workqueue_internal.h"
 
-enum {
+enum worker_pool_flags {
 	/*
 	 * worker_pool flags
 	 *
@@ -75,7 +75,9 @@ enum {
 	 */
 	POOL_MANAGER_ACTIVE	= 1 << 0,	/* being managed */
 	POOL_DISASSOCIATED	= 1 << 2,	/* cpu can't serve workers */
+};
 
+enum worker_flags {
 	/* worker flags */
 	WORKER_DIE		= 1 << 1,	/* die die die */
 	WORKER_IDLE		= 1 << 2,	/* is idle */
@@ -86,7 +88,9 @@ enum {
 
 	WORKER_NOT_RUNNING	= WORKER_PREP | WORKER_CPU_INTENSIVE |
 				  WORKER_UNBOUND | WORKER_REBOUND,
+};
 
+enum wq_internal_consts {
 	NR_STD_WORKER_POOLS	= 2,		/* # standard pools per cpu */
 
 	UNBOUND_POOL_HASH_ORDER	= 6,		/* hashed by pool->attrs */