Re: block layer sg, bsg

[Andi Kleen]

> Somewhere I got the idea that if a structure is declared with attribute 
> PACKED, gcc will generate alignment-independent code (e.g., access each field 
> byte by byte) on alignment-restricted architectures.  So if what I imagine 
> about gcc is true, what issues remain?  These structs have to be declared 
> packed anyway and with fixed field sizes, or the layout will vary across 
> architectures.

With packed things should be fine for x86-64/i386. However it may 
generate bad code for other architectures. 

-Andi
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