linux-kernel - [PATCH 07/37] x86, pkeys: Add Kconfig option

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Message-Id: <20151117033520.E03E82F3@viggo.jf.intel.com>
Date:	Mon, 16 Nov 2015 19:35:20 -0800
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, Dave Hansen <dave@...1.net>,
	dave.hansen@...ux.intel.com
Subject: [PATCH 07/37] x86, pkeys: Add Kconfig option


From: Dave Hansen <dave.hansen@...ux.intel.com>

I don't have a strong opinion on whether we need a Kconfig prompt
or not.  Protection Keys has relatively little code associated
with it, and it is not a heavyweight feature to keep enabled.
However, I can imagine that folks would still appreciate being
able to disable it.

Note that, with disabled-features.h, the checks in the code
for protection keys are always the same:

	cpu_has(c, X86_FEATURE_PKU)

With the config option disabled, this essentially turns into an
#ifdef.

We will hide the prompt for now.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
---

 b/arch/x86/Kconfig |    4 ++++
 1 file changed, 4 insertions(+)

diff -puN arch/x86/Kconfig~pkeys-01-kconfig arch/x86/Kconfig
--- a/arch/x86/Kconfig~pkeys-01-kconfig	2015-11-16 12:35:38.310306736 -0800
+++ b/arch/x86/Kconfig	2015-11-16 12:35:38.314306917 -0800
@@ -1680,6 +1680,10 @@ config X86_INTEL_MPX
 
 	  If unsure, say N.
 
+config X86_INTEL_MEMORY_PROTECTION_KEYS
+	def_bool y
+	depends on CPU_SUP_INTEL && X86_64
+
 config EFI
 	bool "EFI runtime service support"
 	depends on ACPI
_
--
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