On Thu, Mar 28, 2013 at 02:47:51PM +0000, Arnd Bergmann wrote:

Since we recently introduced the IS_ENABLED() macro to test for preprocessor
symbols, I think there is a general trend away from any #ifdefs in driver
code.

I have to say I'm not seeing any evidence of this in the patches I'm
seeing, and I'm not sure what the connection with IS_ENABLED() is?  It's
a reasonable idea, just likely to surprise people given the amount of
boilerplate we've got for things like PM - I guess we'd need to make
sure those macros do references as well, they're the main users of
ifdefs.
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