From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Sat, 11 Sep 2010 12:32:36 +0100
Subject: [PATCH] MMCI: use _cansleep GPIO functions
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On Sat, Sep 11, 2010 at 01:22:04PM +0200, Linus Walleij wrote:
> I'll slam in some intermediate bool or something so it's super
> clear what's happening, OK?

No - once you've learnt that !! turns an int into a bool, there's
nothing more that needs to be done.

You'll find !! used throughout the kernel sources.