From: Arnd Bergmann
Date: Tue Jan 04 2011 - 05:36:16 EST

On Tuesday 04 January 2011 09:43:01 Lai Jiangshan wrote:
> As I known, __rcu annotations do not effect the result compiled kernel.
> They work only when we use spare("make C=1" or "make C=2"),
> So we don't need another new switch for it since we have one
> for debugging(use spare or not).
> signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>

The intention of this option was to avoid introducing an excessive
number of false positives when using sparse.

We should only make that unconditional if we are reasonably convinced
that all the majority of warnings caused by it should actually
lead to changes in the code.

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