workqueue: define masks for work flags and conditionalize STATIC flags

Work flags are about to see more traditional mask handling.  Define
WORK_STRUCT_*_BIT as the bit position constant and redefine
WORK_STRUCT_* as bit masks.  Also, make WORK_STRUCT_STATIC_* flags
conditional

While at it, re-define these constants as enums and use
WORK_STRUCT_STATIC instead of hard-coding 2 in
WORK_DATA_STATIC_INIT().

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

1 files changed, 21 insertions, 8 deletions

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index d89cfc1..d60c570 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -22,12 +22,25 @@ typedef void (*work_func_t)(struct work_struct *work);
  */
 #define work_data_bits(work) ((unsigned long *)(&(work)->data))
 
+enum {
+	WORK_STRUCT_PENDING_BIT	= 0,	/* work item is pending execution */
+#ifdef CONFIG_DEBUG_OBJECTS_WORK
+	WORK_STRUCT_STATIC_BIT	= 1,	/* static initializer (debugobjects) */
+#endif
+
+	WORK_STRUCT_PENDING	= 1 << WORK_STRUCT_PENDING_BIT,
+#ifdef CONFIG_DEBUG_OBJECTS_WORK
+	WORK_STRUCT_STATIC	= 1 << WORK_STRUCT_STATIC_BIT,
+#else
+	WORK_STRUCT_STATIC	= 0,
+#endif
+
+	WORK_STRUCT_FLAG_MASK	= 3UL,
+	WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
+};
+
 struct work_struct {
 	atomic_long_t data;
-#define WORK_STRUCT_PENDING 0		/* T if work item pending execution */
-#define WORK_STRUCT_STATIC  1		/* static initializer (debugobjects) */
-#define WORK_STRUCT_FLAG_MASK (3UL)
-#define WORK_STRUCT_WQ_DATA_MASK (~WORK_STRUCT_FLAG_MASK)
 	struct list_head entry;
 	work_func_t func;
 #ifdef CONFIG_LOCKDEP
@@ -36,7 +49,7 @@ struct work_struct {
 };
 
 #define WORK_DATA_INIT()	ATOMIC_LONG_INIT(0)
-#define WORK_DATA_STATIC_INIT()	ATOMIC_LONG_INIT(2)
+#define WORK_DATA_STATIC_INIT()	ATOMIC_LONG_INIT(WORK_STRUCT_STATIC)
 
 struct delayed_work {
 	struct work_struct work;
@@ -98,7 +111,7 @@ extern void __init_work(struct work_struct *work, int onstack);
 extern void destroy_work_on_stack(struct work_struct *work);
 static inline unsigned int work_static(struct work_struct *work)
 {
-	return *work_data_bits(work) & (1 << WORK_STRUCT_STATIC);
+	return *work_data_bits(work) & WORK_STRUCT_STATIC;
 }
 #else
 static inline void __init_work(struct work_struct *work, int onstack) { }
@@ -167,7 +180,7 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
  * @work: The work item in question
  */
 #define work_pending(work) \
-	test_bit(WORK_STRUCT_PENDING, work_data_bits(work))
+	test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
 
 /**
  * delayed_work_pending - Find out whether a delayable work item is currently
@@ -182,7 +195,7 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
  * @work: The work item in question
  */
 #define work_clear_pending(work) \
-	clear_bit(WORK_STRUCT_PENDING, work_data_bits(work))
+	clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
 
 enum {
 	WQ_FREEZEABLE		= 1 << 0, /* freeze during suspend */