From: Michael Buesch <mb@xxxxxxxxx>
Date: Fri, 7 Dec 2007 14:36:08 +0100
> The wire protocol for the iv files is the following structure:
>
> struct b43_iv {
> be16 a;
> union {
> be16 x;
> be32 y;
> } ((attr_packed));
> } ((attr_packed));
>
> How do I handle that in userspace? In kernel space it's simple
> (and we already use get_unaligned() for the 32bit value there).
If you marked it packed, on platforms like sparc, MIPS, and IA-64, the
compiler is only going to use byte loads and stores to objects of this
type.
You don't need to use get_unaligned() on members of structures that
are marked packed.
If you look at the asm-generic/unaligned.h pure-C implementation,
it uses the packed attribute, which really shows how redundant it
is to use get_unaligned() on packed structure member access :-)
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