linux-kernel - Re: [PATCH 3/7] HMM: introduce heterogeneous memory management.

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Date:	Wed, 31 Dec 2014 17:46:44 +0200
From:	Haggai Eran <haggaie@...lanox.com>
To:	<j.glisse@...il.com>, <akpm@...ux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	<joro@...tes.org>, Mel Gorman <mgorman@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Johannes Weiner" <jweiner@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Rik van Riel" <riel@...hat.com>, Dave Airlie <airlied@...hat.com>,
	Brendan Conoboy <blc@...hat.com>,
	Joe Donohue <jdonohue@...hat.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	"Cameron Buschardt" <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...estorage.com>,
	Ben Sander <ben.sander@....com>,
	Greg Stoner <Greg.Stoner@....com>,
	John Bridgman <John.Bridgman@....com>,
	Michael Mantor <Michael.Mantor@....com>,
	"Paul Blinzer" <Paul.Blinzer@....com>,
	Laurent Morichetti <Laurent.Morichetti@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Oded Gabbay <Oded.Gabbay@....com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Jatin Kumar <jakumar@...dia.com>
Subject: Re: [PATCH 3/7] HMM: introduce heterogeneous memory management.

Hi,

On 22/12/2014 18:48, j.glisse@...il.com wrote:
> +/* hmm_device_register() - register a device with HMM.
> + *
> + * @device: The hmm_device struct.
> + * Returns: 0 on success or -EINVAL otherwise.
> + *
> + *
> + * Call when device driver want to register itself with HMM. Device driver can
> + * only register once. It will return a reference on the device thus to release
> + * a device the driver must unreference the device.

I see that the code doesn't actually have a reference count on the
hmm_device, but just registers and unregisters it through the
hmm_device_register/hmm_device_unregister functions. Perhaps you should
update the comment here to tell that.

> + */
> +int hmm_device_register(struct hmm_device *device)
> +{
> +	/* sanity check */
> +	BUG_ON(!device);
> +	BUG_ON(!device->name);
> +	BUG_ON(!device->ops);
> +	BUG_ON(!device->ops->release);
> +
> +	mutex_init(&device->mutex);
> +	INIT_LIST_HEAD(&device->mirrors);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(hmm_device_register);

Regards,
Haggai
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