From: Andrew Morton <[email protected]>
Date: Sat, 4 Feb 2006 15:50:27 -0800
> The !! doesn't seem needed. The name of this function implies that it
> returns a boolean, not a scalar.
As a historical note it used to be a common implementation error to
return "flag & bit" from this function instead of the correct
"(flag & bit) != 0".
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