linux-kernel - Re: [RFC v2 2/6] driver-core: add driver async

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Message-ID: <20140905112417.GB22778@redhat.com>
Date:	Fri, 5 Sep 2014 13:24:17 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	gregkh@...uxfoundation.org, dmitry.torokhov@...il.com,
	falcon@...zu.com, tiwai@...e.de, tj@...nel.org,
	arjan@...ux.intel.com, linux-kernel@...r.kernel.org, hare@...e.com,
	akpm@...ux-foundation.org, penguin-kernel@...ove.sakura.ne.jp,
	joseph.salisbury@...onical.com, bpoirier@...e.de,
	santosh@...lsio.com, "Luis R. Rodriguez" <mcgrof@...e.com>,
	Kay Sievers <kay@...y.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tim Gardner <tim.gardner@...onical.com>,
	Pierre Fersing <pierre-fersing@...rref.org>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [RFC v2 2/6] driver-core: add driver async_probe support

On 09/04, Luis R. Rodriguez wrote:
>
>  struct driver_private {
>  	struct kobject kobj;
>  	struct klist klist_devices;
>  	struct klist_node knode_bus;
>  	struct module_kobject *mkobj;
> +	struct driver_attach_work *attach_work;
>  	struct device_driver *driver;

I am not arguing, just curious...

Are you trying to shrink sizeof(driver_private) ? The code can be simpler
if you just embedd "struct work_struct attach_work" into driver_private,
and you do not need "struct driver_attach_work" or another ->driver pointer
this way.

Oleg.

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