[RFC] change non-atomic bitops method
davem at davemloft.net
Tue Feb 3 00:40:31 PST 2015
From: Andrew Morton <akpm at linux-foundation.org>
Date: Mon, 2 Feb 2015 22:38:51 -0800
> It is only with both these ratios that we can work out whether the
> patch is a net gain. My suspicion is that set_bit on an already-set
> bit is so rare that the patch will be a loss.
A common pattern is implementing a "referenced" bit, and in that case
the bit is often already set, and in such a scenerio the proposed
change is a huge win.
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