linux-kernel - Kconfig: '+config' valid syntax?

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Date:	Thu, 2 Jul 2015 10:08:36 +0200
From:	Valentin Rothberg <valentinrothberg@...il.com>
To:	rafael.j.wysocki@...el.com, Paul Bolle <pebolle@...cali.nl>,
	yann.morin.1998@...e.fr, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andreas Ruprecht <andreas.ruprecht@....de>,
	hengelein Stefan <stefan.hengelein@....de>,
	linux@...inikbrodowski.net
Subject: Kconfig: '+config' valid syntax?

Hi,

commit ed013214afa7 ("ACPI / init: Make it possible to override _REV")
is in today's linux-next tree (i.e., next-20150702) adding the
following hunk to drivers/acpi/Kconfig:

--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -428,6 +428,26 @@ config XPOWER_PMIC_OPREGION
        help
          This config adds ACPI operation region support for XPower AXP288 PMIC.

++config ACPI_REV_OVERRIDE_POSSIBLE
+       bool "Allow supported ACPI revision to be overriden"
+       depends on X86
+       default y
[...]

By having a close look at the first added line, we can see that
'+config ACPI_...' is added.  To my great surprise, it's valid Kconfig
syntax.  How is that possible?  IMHO it's an invalid token, such that
Kconfig should complain about it.  Or do I miss something?

Kind regards,
 Valentin
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