[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20140904133337.GA1771@lerouge>
Date: Thu, 4 Sep 2014 15:33:40 +0200
From: Frederic Weisbecker <fweisbec@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Catalin Iacob <iacobcatalin@...il.com>,
Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...nel.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 3/9] irq_work: Force raised irq work to run on irq
work interrupt
On Thu, Sep 04, 2014 at 08:11:37AM +0200, Peter Zijlstra wrote:
> On Thu, Aug 21, 2014 at 04:52:51PM +0200, Frederic Weisbecker wrote:
> > diff --git a/kernel/irq_work.c b/kernel/irq_work.c
> > index e6bcbe7..17bd203 100644
> > --- a/kernel/irq_work.c
> > +++ b/kernel/irq_work.c
> > @@ -22,6 +22,7 @@
> >
> > static DEFINE_PER_CPU(struct llist_head, raised_list);
> > static DEFINE_PER_CPU(struct llist_head, lazy_list);
> > +static bool has_own_interrupt;
> >
> > /*
> > * Claim the entry so that no one else will poke at it.
>
> > +void irq_work_tick(void)
> > +{
> > + if (!has_own_interrupt)
> > + irq_work_run_list(&__get_cpu_var(raised_list));
> > + irq_work_run_list(&__get_cpu_var(lazy_list));
> > +}
> > +
> > /*
> > * Synchronize against the irq_work @entry, ensures the entry is not
> > * currently in use.
>
> Why not something like the below; then it becomes a compile time matter.
Problem is that some archs only have that information at runtime.
See x86 for example which tests cpu_has_apic.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists