Re: [PATCH -next] static-keys: Better error checking for static_key_enable/disable

From: Peter Zijlstra
Date: Thu Aug 27 2015 - 18:23:32 EST

On Thu, Aug 27, 2015 at 04:57:13PM -0400, Chuck Ebbert wrote:
> The warnings for static_key_enable/disable don't catch common
> errors. For example, starting with a default enabled key and
> calling enable doesn't cause a warning until the next enable
> or disable. Check explicitly for zero or one instead of allowing
> both values in every case. Generated code should be smaller too.

I explicitly intended to allow multiple consecutive static_key_enable()
calls (same for disable).

If its already enabled, calling enable should be a no-op.
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