linux-kernel - Re: [RFC] Documentation about unaligned memory access

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Date:	Mon, 26 Nov 2007 15:51:43 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Daniel Drake <dsd@...too.org>
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	kune@...ne-taler.de
Subject: Re: [RFC] Documentation about unaligned memory access


> Going back to an earlier example:
> 	void myfunc(u8 *data, u32 value)
> 	{
> 		[...]
> 		*((u16 *) data) = cpu_to_le32(value);
> 		[...]

typo? should it be a u32 cast?

> To avoid the unaligned memory access, you could rewrite it as follows:
> 
> 	void myfunc(u8 *data, u32 value)
> 	{
> 		[...]
> 		value = cpu_to_le32(value);
> 		memcpy(data, value, sizeof(value));
> 		[...]
> 	}

I think you should use put_unaligned here as well. Or maybe just reorder
this vs. the section below where you use get/put_unaligned.

johannes

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