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Merge branch 'core/irq_work' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into irq/core

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irq_work fixes and cleanups, in preparation for full dyntics support.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2013-01-24 12:48:41 +01:00
parent befddb21c8 6147a9d807
commit 786133f6e8
16 changed files with 15 additions and 24 deletions
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kernel/irq_work.c
+15 -6
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@@ -34,15 +34,21 @@ static DEFINE_PER_CPU(struct llist_head, irq_work_list);
*/
static bool irq_work_claim(struct irq_work *work)
{
unsigned long flags, nflags;
unsigned long flags, oflags, nflags;
/*
* Start with our best wish as a premise but only trust any
* flag value after cmpxchg() result.
*/
flags = work->flags & ~IRQ_WORK_PENDING;
for (;;) {
flags = work->flags;
if (flags & IRQ_WORK_PENDING)
return false;
nflags = flags | IRQ_WORK_FLAGS;
if (cmpxchg(&work->flags, flags, nflags) == flags)
oflags = cmpxchg(&work->flags, flags, nflags);
if (oflags == flags)
break;
if (oflags & IRQ_WORK_PENDING)
return false;
flags = oflags;
cpu_relax();
}
@@ -119,8 +125,11 @@ void irq_work_run(void)
/*
* Clear the PENDING bit, after this point the @work
* can be re-used.
* Make it immediately visible so that other CPUs trying
* to claim that work don't rely on us to handle their data
* while we are in the middle of the func.
*/
work->flags = IRQ_WORK_BUSY;
xchg(&work->flags, IRQ_WORK_BUSY);
work->func(work);
/*
* Clear the BUSY bit and return to the free state if