linux-kernel - [PATCH 18/26] x86, pkeys: add Kconfig prompt to existing config option

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Message-Id: <20150916174909.B4D79DCE@viggo.jf.intel.com>
Date:	Wed, 16 Sep 2015 10:49:09 -0700
From:	Dave Hansen <dave@...1.net>
To:	dave@...1.net
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 18/26] x86, pkeys: add Kconfig prompt to existing config option


I don't have a strong opinion on whether we need this 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.

Here's the option if folks want it.

---

 b/arch/x86/Kconfig |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff -puN arch/x86/Kconfig~pkeys-40-kconfig-prompt arch/x86/Kconfig
--- a/arch/x86/Kconfig~pkeys-40-kconfig-prompt	2015-09-16 10:48:19.287329737 -0700
+++ b/arch/x86/Kconfig	2015-09-16 10:48:19.291329919 -0700
@@ -1696,8 +1696,18 @@ config X86_INTEL_MPX
 	  If unsure, say N.
 
 config X86_INTEL_MEMORY_PROTECTION_KEYS
+	prompt "Intel Memory Protection Keys"
 	def_bool y
+	# Note: only available in 64-bit mode
 	depends on CPU_SUP_INTEL && X86_64
+	---help---
+	  Memory Protection Keys provides a mechanism for enforcing
+	  page-based protections, but without requiring modification of the
+	  page tables when an application changes protection domains.
+
+	  For details, see Documentation/x86/protection-keys.txt
+
+	  If unsure, say y.
 
 config EFI
 	bool "EFI runtime service support"
_
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