linux-kernel - Re: [2.6.18-rc7] printk output delay in syslog wrt dmesg still unfixed

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Date:	Thu, 21 Sep 2006 16:35:11 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: [2.6.18-rc7] printk output delay in syslog wrt dmesg still
	unfixed

On Fri, 2006-09-22 at 01:28 +0200, Tilman Schmidt wrote:
> On 19.09.2006 20:52, john stultz wrote:
> > You might try git-bisect to find the offending patch.
> 
> This turned out to be easier than I expected.
> The patch which introduces the problem is:
> 
> [a0f1ccfd8d37457a6d8a9e01acebeefcdfcc306e] lockdep: do not recurse in printk

When you've narrow down a patch, be sure to CC the author (in this case
Ingo).

> Reverting that patch makes the problem disappear in 2.6.18, too.
> In fact, it suffices to revert just the last chunk:
> 
> @@ -809,8 +815,15 @@ void release_console_sem(void)
>         console_may_schedule = 0;
>         up(&console_sem);
>         spin_unlock_irqrestore(&logbuf_lock, flags);
> -       if (wake_klogd && !oops_in_progress && waitqueue_active(&log_wait))
> -               wake_up_interruptible(&log_wait);
> +       if (wake_klogd && !oops_in_progress && waitqueue_active(&log_wait)) {
> +               /*
> +                * If we printk from within the lock dependency code,
> +                * from within the scheduler code, then do not lock
> +                * up due to self-recursion:
> +                */
> +               if (!lockdep_internal())
> +                       wake_up_interruptible(&log_wait);
> +       }
>  }
>  EXPORT_SYMBOL(release_console_sem);

Ingo, your thoughts?

thanks
-john

-
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