Re: [PATCH/RFC] introduce ARCH_CAN_UNALIGNED_ACCESS Kconfig symbol
From: Will Newton <hidden>
Date: 2008-03-20 14:39:19
Also in:
linux-wireless, lkml
On Thu, Mar 20, 2008 at 2:34 PM, Johannes Berg [off-list ref] wrote:
+For some ethernet hardware that cannot DMA to unaligned addresses like +4*n+2 or non-ethernet hardware, this can be a problem, and it is then +required to copy the incoming frame into an aligned buffer. Because this is +unnecessary on architectures that can do unaligned accesses, the code can be +made depend on CONFIG_ARCH_CAN_UNALIGNED_ACCESS like so: + +#ifdef CONFIG_ARCH_CAN_UNALIGNED_ACCESS + skb = copy skb +#else + skb = original skb +#endif
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