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Date:	Tue, 7 Oct 2014 13:34:04 -0400
From:	Tejun Heo <>
To:	"Luis R. Rodriguez" <>
Cc:	"Luis R. Rodriguez" <>,,,,,,,,,,,,,,,
	Tetsuo Handa <>,
	Joseph Salisbury <>,
	Kay Sievers <>,
	One Thousand Gnomes <>,
	Tim Gardner <>,
	Pierre Fersing <>,
	Andrew Morton <>,
	Nagalakshmi Nandigama <>,
	Praveen Krishnamoorthy <>,
	Sreekanth Reddy <>,
	Abhijit Mahajan <>,
	Casey Leedom <>,
	Hariprasad S <>,,,
Subject: Re: [PATCH v2 7/7] driver-core: add preferred async probe option for
 built-in and modules


On Tue, Oct 07, 2014 at 01:10:46AM +0200, Luis R. Rodriguez wrote:
> On Mon, Oct 06, 2014 at 05:01:18PM -0400, Tejun Heo wrote:
> > For in-kernel stuff, we already have a clear
> > synchronization point where we already synchronize all async calls.
> > Shouldn't we be flushing these async probes there too?
> This seems to be addressing if what I meant by prepared, "ready", so let
> me address this as I do think its important.
> By async calls do you mean users of async_schedule()? I see it


> also uses system_unbound_wq as well but I do not see anyone calling
> flush_workqueue(system_unbound_wq) on the kernel. We do use
> async_synchronize_full() on kernel_init() but that just waits.

But you can create a new workqueue and queue all the async probing
work items there and flush the workqueue right after

> bus.enable_kern_async=1 would still also serve as a helper for the driver core
> to figure out if it should use async probe then on modules if prefer_async_probe
> was enabled. Let me know if you figure out a way to avoid it.

Why do we need the choice at all?  It always should, no?


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