linux-kernel - Re: [PATCH] x86: mtrr fix debug parameter

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Date:	Tue, 20 Jan 2009 10:10:49 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	<mingo@...e.hu>, "Thomas Renninger" <trenn@...e.de>
Subject: Re: [PATCH] x86: mtrr fix debug parameter

I've been carrying a change like this for quite some time in a bigger patch,
but never got to actually split it out and submit it. Thanks for doing this,
Thomas! (And yes, it did work at the time it was added.)

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

>>> Thomas Renninger <trenn@...e.de> 20.01.09 10:37 >>>
while looking at:
http://bugzilla.kernel.org/show_bug.cgi?id=11541 
I realized that the mtrr.show param cannot work, because
the code is processed much too early.

This patch:
 - Declares mtrr.show as early_param
 - Stays consistent with the previous param (which I doubt
   that it ever worked), so mtrr.show=1 would still work
 - Declares mtrr_show as initdata


Signed-off-by: Thomas Renninger <trenn@...e.de>

---
 arch/x86/kernel/cpu/mtrr/generic.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

Index: linux-2.6/arch/x86/kernel/cpu/mtrr/generic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/mtrr/generic.c
+++ linux-2.6/arch/x86/kernel/cpu/mtrr/generic.c
@@ -33,11 +33,13 @@ u64 mtrr_tom2;
 struct mtrr_state_type mtrr_state = {};
 EXPORT_SYMBOL_GPL(mtrr_state);
 
-#undef MODULE_PARAM_PREFIX
-#define MODULE_PARAM_PREFIX "mtrr."
-
-static int mtrr_show;
-module_param_named(show, mtrr_show, bool, 0);
+static int __initdata mtrr_show;
+static int __init mtrr_debug(char *opt)
+{
+	mtrr_show = 1;
+	return 0;
+}
+early_param("mtrr.show", mtrr_debug);
 
 /*
  * Returns the effective MTRR type for the region


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