linux-kernel - Re: I need help with a sparse warning

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Date:	Fri, 12 Sep 2008 06:44:09 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	wireless <linux-wireless@...r.kernel.org>
Subject: Re: I need help with a sparse warning

On Thu, Sep 11, 2008 at 09:13:20PM -0500, Larry Finger wrote:
> In file drivers/net/wireless/p54/p54common.c, the statement
>
>        priv->rx_mtu = (size_t) le16_to_cpu((__le16)bootrec->data[10]);
>
> generates the sparse warning
>
> .../p54common.c:185:29: warning: cast to restricted __le16
>
> where bootrec->data is u32, and priv->rx_mtu is u16.
>
> What should be done to eliminate this warning?

What is the intent?

MTU is 2-byte little-endian starting at 40-th byte?

Oh, and size_t cast is pointless.
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