linux-kernel - Re: 2.6.30-rc8 Oops whilst booting

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Message-Id: <200906082103.53281.chris2553@googlemail.com>
Date:	Mon, 8 Jun 2009 21:03:53 +0100
From:	Chris Clayton <chris2553@...glemail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	NeilBrown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	scsi <linux-scsi@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: 2.6.30-rc8 Oops whilst booting

On Monday 08 June 2009, Chris Clayton wrote:
> Linus,
>
> 2009/6/8 Linus Torvalds <torvalds@...ux-foundation.org>:
> > On Mon, 8 Jun 2009, Chris Clayton wrote:
> >> I can confirm that a kernel built with Jaswinder's patch applied
> >> survived 200 boots without a panic.
> >
> > Ok, goodie.
> >
> > Can you confirm that the further cleanup (removing the pointless 'ret'
> > variable and the useless empty checking around 'for_each_entry') also
> > works for you?
> >
> >                Linus
> >
> > ---
> >  kernel/async.c |   15 +++++----------
> >  1 files changed, 5 insertions(+), 10 deletions(-)
> >
> > diff --git a/kernel/async.c b/kernel/async.c
> > index 5054030..27235f5 100644
> > --- a/kernel/async.c
> > +++ b/kernel/async.c
> > @@ -92,23 +92,18 @@ extern int initcall_debug;
> >  static async_cookie_t  __lowest_in_progress(struct list_head *running)
> >  {
> >        struct async_entry *entry;
> > -       async_cookie_t ret = next_cookie; /* begin with "infinity" value
> > */
> >
> >        if (!list_empty(running)) {
> >                entry = list_first_entry(running,
> >                        struct async_entry, list);
> > -               ret = entry->cookie;
> > +               return entry->cookie;
> >        }
> >
> > -       if (!list_empty(&async_pending)) {
> > -               list_for_each_entry(entry, &async_pending, list)
> > -                       if (entry->running == running) {
> > -                               ret = entry->cookie;
> > -                               break;
> > -                       }
> > -       }
> > +       list_for_each_entry(entry, &async_pending, list)
> > +               if (entry->running == running)
> > +                       return entry->cookie;
> >
> > -       return ret;
> > +       return next_cookie;     /* "infinity" value */
> >  }
> >
> >  static async_cookie_t  lowest_in_progress(struct list_head *running)
>
> Yes, rc8-git5 with your patch applied has booted 100 times without a panic.
>

...so I should have added:

Tested-by: Chris Clayton <chris2553@...glemail.com>

> May I add that the people who thought of, designed and implemented
> kexec should have a large and shiny medals pinned to their chests.
> Well over 1000 kernel boots have been executed on my PC today and, if
> I hadn't been able to do that automatically with a few lines of script
> at the head of /etc/rc.d/rc.local, I would have been bleary-eyed
> before noon :-)
>
> Chris



-- 
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so much happiness is produced as by a good tavern or inn - Doctor Samuel
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