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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 <brgl@bgdev.pl>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1515125996-21564-1-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Bartosz Golaszewski 2018-01-05 05:19:56 +01:00 committed by Ingo Molnar
parent b2cd1df660
commit 6baf9e67c9
2 changed files with 8 additions and 5 deletions
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11
include/linux/irq_work.h
View File

@ -13,10 +13,13 @@
* busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
*/ */
#define IRQ_WORK_PENDING 1UL #define IRQ_WORK_PENDING BIT(0)
#define IRQ_WORK_BUSY 2UL #define IRQ_WORK_BUSY BIT(1)
#define IRQ_WORK_FLAGS 3UL
#define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */ /* Doesn't want IPI, wait for tick: */
#define IRQ_WORK_LAZY BIT(2)
#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
struct irq_work { struct irq_work {
unsigned long flags; unsigned long flags;

2
kernel/irq_work.c
View File

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