Re: [PATCH 1/2] BDI: Provide backing device capability information

[Andrew Morton]

David Howells <dhowells@xxxxxxxxxx> wrote:
>
> Andrew Morton <akpm@xxxxxxxx> wrote:
> 
> > > Any particular reason? It's mixed in with other unsigned longs and pointers
> > > after all...
> > 
> > Just that it's the natural wordsize of the machine, and uses less storage.
> 
> Making it unsigned long on a 32-bit machine will make no difference. Making it
> unsigned int on a 64-bit machine will waste four bytes.
> 

No, it won't waste any bytes at all.  It won't save any either.

But if someone comes along later and wants to add another int to that
structure, they won't know that your field was needlessly made a long, and
they'll then waste another eight bytes.

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