[arch-projects] [RFC] [PATCH] [mkinitcpio] Cleanly stop udev >= 168 as recommended by upstream.

[Gerardo Exequiel Pozzi]

On 05/02/2011 05:51 AM, Thomas Bächler wrote:
> Am 02.05.2011 06:22, schrieb Dave Reisner:
>> The settle is actually unnecessary here, as its called as part of the
>> udev hook.  I don't see a need to call it twice.
> https://projects.archlinux.org/mkinitcpio.git/commit/?id=3c6a2fab7e5a347d92bba152dca367fcbfabc3a6
>
> It seems I forgot to add an explanation back then, but there were
> problems when aborting while uevents were still active.
>
>> On the other hand, I've
>> notice that dracut makes the call 'udevadm control --stop-exec-queue'
>> prior to shutting down udevd. Perhaps we should be using that instead?
> No idea. We need to prevent races here. What we would need is an atomic
> "settle and shut down" that doesn't queue any further events between
> settling and the shutdown.
>
I just Asked to udev author:

----
On 05/02/2011 08:41 AM, Kay Sievers wrote:
> On Mon, May 2, 2011 at 05:45, Gerardo Exequiel Pozzi
> <vmlinuz386 at yahoo.com.ar>  wrote:
>> Hello Kay
>>
>> At initramfs stage: what is the best way / order, to stop udev?.
>>
>> 1)
>> udevadm settle
>> udevadm info --cleanup-db
>> udevadm control --exit
>>
>> 2)
>> udevadm settle
>> udevadm control --exit
>> udevadm info --cleanup-db
>>
>> 3)
>> udevadm control --exit
>> udevadm info --cleanup-db
> Settle is not needed, it's done with --exit. The --cleanup-db should
> be after the --exit. So it's 3).
>
> Kay
>
Thank you!
----

-- 
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1