lkml.org 
[lkml]   [2012]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()
From
Date
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);
> +}


\
 
 \ /
  Last update: 2012-03-06 12:01    [from the cache]
©2003-2011 Jasper Spaans