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Message-ID: <20080219155252.GA27280@elte.hu>
Date: Tue, 19 Feb 2008 16:52:52 +0100
From: Ingo Molnar <mingo@...e.hu>
To: "Ahmed S. Darwish" <darwish.07@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...hat.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Tasklets: Avoid duplicating __tasklet_{,hi_}schedule()
code
* Ahmed S. Darwish <darwish.07@...il.com> wrote:
> - local_irq_disable();
> - t->next = __get_cpu_var(tasklet_vec).list;
> - __get_cpu_var(tasklet_vec).list = t;
> - __raise_softirq_irqoff(TASKLET_SOFTIRQ);
> - local_irq_enable();
> + /* We were not lucky enough to run, reschedule. */
> + __tasklet_schedule(t);
i think there's a subtle difference that you missed: this one does
__raise_softirq_irqoff(), while __tasklet_schedule() does a
raise_softirq_irqoff(). (note the lack of undescores)
the reason is to avoid infinitely self-activating tasklets.
Ingo
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