linux-kernel - Re: [PATCH v3] MM: CMA: add a simple kernel module as the helper to test CMA

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Date:	Wed, 07 Mar 2012 11:59:03 +0100
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	m.szyprowski@...sung.com, "Barry Song" <Barry.Song@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	workgroup.linux@....com, "Barry Song" <Baohua.Song@....com>
Subject: Re: [PATCH v3] MM: CMA: add a simple kernel module as the helper to
 test CMA

Thanks!  Some minor comments, hopefully last ones:

On Wed, 07 Mar 2012 04:14:58 +0100, Barry Song <Barry.Song@....com> wrote:
> +static ssize_t
> +cma_test_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
> +{

[...]

> +	_dev_info(cma_dev, "free: CM virt: %p dma: %p size:%uK\n",

This should read: “size: %zuK”.  “z” is the proper modifier to use for size_t type.

> +		alloc->virt, (void *)alloc->dma, alloc->size / SZ_1K);
> +	kfree(alloc);
> +
> +	return 0;
> +}

> +static ssize_t
> +cma_test_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
> +{
> +	struct cma_allocation *alloc;
> +	size_t size;
> +	int ret;
> +
> +	ret = kstrtouint_from_user(buf, count, 0, &size);

kstrtouint_from_user() expects pointer to unsigned int, size_t is not always
unsigned int.  It may be unsigned long.  As such, size should be of type
unsigned long and this line should use kstrtoulong_from_user().

[...]

> +	if (alloc->virt) {
> +		_dev_info(cma_dev, "alloc: virt: %p dma: %p size: %uK\n",
> +			alloc->virt, (void *)alloc->dma, size);

Like previously, this should be “size: %zuK”.

[...]

> +}

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@...gle.com>--------------ooO--(_)--Ooo--
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