Re: [PATCH] ubi: kill homegrown endian macros

[Segher Boessenkool <segher@kernel.crashing.org>]

> > Out of curiosity, why would a compiler ever insert padding in a 
> > structure
> > that has all its elements properly-aligned?
>
> Well, it might decide it would be nicer if some elements were aligned 
> to
> 64 bits. Or to a cache line. Or something. I don't care about _why_ --
> the point is that it's _allowed_ to. Hence the original use of
> __attribute__((packed)).

It's not the compiler who decides -- struct layout is
dictated by the ABI you're compiling for.


Segher

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