LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Ingo Molnar <mingo@elte.hu>
To: "Ahmed S. Darwish" <darwish.07@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Tasklets: Avoid duplicating __tasklet_{,hi_}schedule() code
Date: Tue, 19 Feb 2008 16:52:52 +0100	[thread overview]
Message-ID: <20080219155252.GA27280@elte.hu> (raw)
In-Reply-To: <20080219153720.GA2967@ubuntu>


* Ahmed S. Darwish <darwish.07@gmail.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

  reply	other threads:[~2008-02-19 15:53 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-19 15:37 Ahmed S. Darwish
2008-02-19 15:52 ` Ingo Molnar [this message]
2008-02-19 16:27   ` Ahmed S. Darwish
2008-02-20 10:41     ` Ingo Molnar
2008-02-20 13:37       ` Ahmed S. Darwish
2008-02-20 14:20         ` Dmitry Adamushko
2008-02-20 19:39           ` Ahmed S. Darwish

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20080219155252.GA27280@elte.hu \
    --to=mingo@elte.hu \
    --cc=akpm@linux-foundation.org \
    --cc=darwish.07@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --subject='Re: [PATCH] Tasklets: Avoid duplicating __tasklet_{,hi_}schedule() code' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox