From: David Rientjes <rientjes@google.com>
To: Michal Nazarewicz <mpn@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cma: use unsigned type for count argument
Date: Wed, 26 Dec 2012 17:59:18 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.00.1212261755450.4150@chino.kir.corp.google.com> (raw)
In-Reply-To: <xa1tip7u14tq.fsf@mina86.com>
On Sat, 22 Dec 2012, Michal Nazarewicz wrote:
> So I think just adding the following, should be sufficient to make
> everyone happy:
>
> diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
> index e34e3e0..e91743b 100644
> --- a/drivers/base/dma-contiguous.c
> +++ b/drivers/base/dma-contiguous.c
> @@ -320,7 +320,7 @@ struct page *dma_alloc_from_contiguous(struct device *dev, unsigned int count,
> pr_debug("%s(cma %p, count %u, align %u)\n", __func__, (void *)cma,
> count, align);
>
> - if (!count)
> + if (!count || count > INT_MAX)
> return NULL;
>
> mask = (1 << align) - 1;
How is this different than leaving the formal to have a signed type, i.e.
drop your patch, and testing for count <= 0 instead?
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next prev parent reply other threads:[~2012-12-27 1:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-19 17:44 Michal Nazarewicz
2012-12-20 23:35 ` Andrew Morton
2012-12-21 0:03 ` David Rientjes
2012-12-22 15:31 ` Michal Nazarewicz
2012-12-27 1:59 ` David Rientjes [this message]
2012-12-27 2:05 ` Michal Nazarewicz
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