linux-kernel - Re: [RFC PATCH v3] drivercore: Add driver probe deferral mechanism

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Date:	Thu, 22 Sep 2011 14:19:29 -0700
From:	David Daney <david.daney@...ium.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Greg Kroah-Hartman <greg@...ah.com>,
	Dilan Lee <dilee@...dia.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Manjunath GKondaiah <manjunath.gkondaiah@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC PATCH v3] drivercore: Add driver probe deferral mechanism

On 09/22/2011 01:29 PM, Alan Cox wrote:
> Definitely what is needed for some of the x86 SoC stuff and would let us
> rip out some of the special case magic for the SCU discovery.
>
> First thing that strikes me is driver_bound kicks the processing queue
> again. That seems odd - surely this isn't needed because any driver that
> does initialise this time and may allow something else to get going will
> queue the kick itself. Thus this seems to just add overhead.
>

Do you mean explicitly kick the queue?

How would a given driver know that something else is waiting for it?  Or 
would we add the explicit kick to each and every driver in the tree?


> It all looks a bit O(N²) if we don't expect the drivers that might
> trigger something else binding to just say 'hey I'm one of the
> troublemakers'

I think it probably is O(N²), but N is small...



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