linux-kernel - Re: [PATCH 3/3] EDAC: amd64_edac: decide if driver can load successfully early.

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Message-ID: <20150319172228.GT25365@htj.duckdns.org>
Date:	Thu, 19 Mar 2015 13:22:28 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	Doug Thompson <dougthompson@...ssion.com>,
	linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Olof Johansson <olof@...om.net>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Luis R . Rodriguez" <mcgrof@...e.com>
Subject: Re: [PATCH 3/3] EDAC: amd64_edac: decide if driver can load
 successfully early.

On Thu, Mar 19, 2015 at 09:57:41AM -0700, Dmitry Torokhov wrote:
> In all fairness platform_driver_probe() does pretty much the same and
> forces us to mark thus drivers with PROBE_FORCE_SYNCHRONOUS as well. And
> there are quite a few of them:
> 
> dtor@...r-ws:~/kernel/work$ grep -r "platform_driver_probe" drivers/ |
> wc -l
> 186
> 
> What makes edac unusual is that PCI bus is hot-pluggable and thus PCI
> drivers are rarely one-shot.

As long as it's not buried in each driver and has some generic model,
it's okay.  They're at least annotated and digging them out and
handling them as a class of drivers is okay but we really should stay
away from one-off hacks in individual drivers.  Things like that add a
lot of overhead in the long term.  I'm just kinda baffled that
Borislav's response to "that's hacky, let's not do that or do that in
a generic manner" is coming back with more hacks.

Thanks.

-- 
tejun
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