Re: [Xen-devel] [PATCH] linux/x86: convert 'cpu' (and a few other) variables to unsigned

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Jan Beulich writes ("[Xen-devel] [PATCH] linux/x86: convert 'cpu' (and a few 
other) variables to unsigned"):
> .. producing better code for x86-64.
> 
> As usual, written and tested on 2.6.24-rc7 and made apply to the 2.6.18
> tree without further testing.

In what way does this produce better code for x86-64 ?

Normally it's IMO best practice to avoid `unsigned' other than for
bitfields, clock arithmetic, and the like, because the behaviour of
unsigned in the presence of subtraction and comparision is often
surprising.

Ian.

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