irq_work: improve the flag definitions

IRQ_WORK_FLAGS is defined simply to 3UL. This is confusing as it says nothing about its purpose. Define IRQ_WORK_FLAGS as a bitwise OR of IRQ_WORK_PENDING and IRQ_WORK_BUSY and change its name to IRQ_WORK_CLAIMED.

While we're at it: use the BIT() macro for all flags.

Signed-off-by Bartosz Golaszewski <[email protected]>

---
v1 -> v2:
- IRQ_WORK_LAZY is defined to 4UL which is BIT(2) not BIT(3)

v2 -> v3:
- rename IRQ_WORK_FLAGS to IRQ_WORK_CLAIMED

 include/linux/irq_work.h | 8 ++++----
 kernel/irq_work.c        | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

include/linux/irq_work.h +4 -4

index 47b9ebd4a74f..499b7f7159d6 100644
@@ -12,10 +12,10 @@
  * busy      NULL, 2 -> {free, claimed} : callback in progress, can be claimed
  */
 
-#define IRQ_WORK_PENDING       1UL
-#define IRQ_WORK_BUSY          2UL
-#define IRQ_WORK_FLAGS         3UL
-#define IRQ_WORK_LAZY          4UL /* Doesn't want IPI, wait for tick */
+#define IRQ_WORK_PENDING       BIT(0)
+#define IRQ_WORK_BUSY          BIT(1)
+#define IRQ_WORK_CLAIMED       (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
+#define IRQ_WORK_LAZY          BIT(2) /* Doesn't want IPI, wait for tick */
 
 struct irq_work {
        unsigned long flags;

kernel/irq_work.c +1 -2

index bcf107ce0854..1b51c6bbb5d3 100644
@@ -36,7 +36,7 @@ static bool irq_work_claim(struct irq_work *work)
         */
        flags = work->flags & ~IRQ_WORK_PENDING;
        for (;;) {
-               nflags = flags | IRQ_WORK_FLAGS;
+               nflags = flags | IRQ_WORK_CLAIMED;
                oflags = cmpxchg(&work->flags, flags, nflags);
                if (oflags == flags)
                        break;
--

2.13.2