Re: [PATCH] utilities: add helper functions for safe 64-bit integeroperations as 32-bit halves

[Alan Cox]

> > +#define lower_32_bits(n) (sizeof(n) == 8 ? (u32)(n) : (n))
> 
> n&0xffffffff would be simpler.
> 
> Do we actually have any call for this?

The only case for all of this we care about is sector_t, which is one
type, with specific properties (eg always being positive). The rest is
over-engineering. Call it sector_upper32() do it the simple way and stop
trying to solve a problem we don't have
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