minmax: Add in_range() macro

minmax: Add in_range() macro

Determine if a value lies within a range more efficiently (subtraction +
comparison vs two comparisons and an AND).  It also has useful (under
some circumstances) behaviour if the range exceeds the maximum value of
the type.  Convert all the conflicting definitions of in_range() within
the kernel; some can use the generic definition while others need their
own definition.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>