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    SubjectRe: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()
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    On Tue, 2012-03-06 at 17:57 +0800, Lai Jiangshan wrote:
    > /*
    > + * 'return left < right;' but handle the overflow issues.
    > + * The same as 'return (long)(right - left) > 0;' but it cares more.

    About what? And why? We do the (long)(a - b) thing all over the kernel,
    why would you care more?

    > + */
    > +static inline
    > +bool safe_less_than(unsigned long left, unsigned long right, unsigned long max)
    > +{
    > + unsigned long a = right - left;
    > + unsigned long b = max - left;
    > +
    > + return !!a && (a <= b);
    > +}


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