Re: [PATCH] Documentation about unaligned memory access

[Brandon Philips]

On 16:11 Mon 03 Dec 2007, Daniel Drake wrote:
> Here's a document I wrote after figuring out what unaligned memory access
> is all about. I've tried to cover the information I was looking for when
> trying to learn about this, without producing a hopelessly detailed/complex
> spew. I hope it is useful to others.
> 
> Signed-off-by: Daniel Drake <dsd@xxxxxxxxxx>
> 
> ---
<snip>
> +These macros work work for memory accesses of any length (not just 32 bits as

Remove a "work" here.

> +in the examples above). Be aware that when compared to standard access of
> +aligned memory, using these macros to access unaligned memory can be costly in
> +terms of performance.
> +
> +If use of such macros is not convenient, another option is to use memcpy(),
> +where the source or destination (or both) are of type u8* or unsigned char*.
> +Due to the byte-wise nature of this operation, unaligned accesses are avoided.

Cheers,

	Brandon
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/