netdev - Re: [PATCH] net: emac: emac gigabit ethernet controller driver

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Date:	Wed, 9 Dec 2015 22:04:03 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	Gilad Avidov <gavidov@...eaurora.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	netdev@...r.kernel.org, sdharia@...eaurora.org,
	linux-arm-msm@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	vikrams@...eaurora.org,
	Shanker Donthineni <shankerd@...eaurora.org>
Subject: Re: [PATCH] net: emac: emac gigabit ethernet controller driver

Gilad Avidov wrote:
> pointer math on void* ?
> what is the size of void ?

I'm talking about adding and subtracting pointer values, so

u32 pkt_len =((void *)ip_hdr(skb) - skb->data)

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