linux-kernel - Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow

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Message-Id: <20090428182837.62c51f26.akpm@linux-foundation.org>
Date:	Tue, 28 Apr 2009 18:28:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Martin Knoblauch <knobi@...bisoft.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	efault@....de, tigran aivazian <tigran@...azian.fsnet.co.uk>
Subject: Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow

On Fri, 24 Apr 2009 05:45:19 -0700 (PDT) Martin Knoblauch <knobi@...bisoft.de> wrote:

> 
> 
>  OK, I just found the reason for both intel-ucode and tg3 failures. Apparently between 2.6.28 and 2.6.29 the mount of sysfs has subtely changed from:
> 
> /sys /sys sysfs rw 0 0
> 
> to:
> 
> none /sys sysfs rw,relatime 0 0

I assume that you're referring to the contents of /proc/mounts?

>  The "none" breaks the RHEL-4 provided hotplug script "firmware.agent" when it tries to parse the mount point for "/sys". As a result, the firmware loading is never properly finished and the driver(s) just timeout on the value  in /sys/class/firmware/timeout. Bingo. Simple fix in user-pace possible - cool down Martin :-)
> 
> Questions remains: was this intentional? It breaks existing userspace and should therefore be considered a regression - right? On the other hand, it will never be a problem for RHEL-4/5 kernels, unless the change in 2.6.29 gets backported. Any ideas?

afaik that was unintentional and was probably a mistake.

I wonder how we did that.
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