linux-kernel - [RFC][PATCH 1/10 -tip] x86: cpu

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Message-Id: <1244910511.11733.16.camel@ht.satnam>
Date:	Sat, 13 Jun 2009 21:58:31 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...nel.org>,
	x86 maintainers <x86@...nel.org>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>, Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robert Richter <robert.richter@....com>
Subject: [RFC][PATCH 1/10 -tip] x86: cpu_debug update Kconfig entry


cpu_debug needs DEBUG_FS.

Explain basic info to use cpu_debug.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/Kconfig |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0c2321d..e5e26b3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -994,9 +994,19 @@ config X86_CPUID
 
 config X86_CPU_DEBUG
 	tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support"
+	select DEBUG_FS
 	---help---
 	  If you select this option, this will provide various x86 CPUs
-	  information through debugfs.
+	  information through debugfs. Any user can read these file but writing
+	  needs root privilege.
+
+	  Note: 1. If you compile cpu_debug as a module, it will _not_ be loaded
+	  automatically (like usual drivers). You will need to load it manually
+	  (or add it to list of modules loaded during boot).
+
+	  2. You need debugfs, if you want to mount debugfs automatically
+	  append this line in /etc/fstab:
+	  debugfs	/sys/kernel/debug	debugfs	defaults	0 0
 
 choice
 	prompt "High Memory Support"
-- 
1.6.0.6



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