linux-kernel - [PATCH] [191/275] x86: Emit "mem=nopentium ignored" warning when not supported

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Message-Id: <20110330210714.C90D13E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:07:14 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	kamal@...onical.com, ak@...ux.intel.com, yinghai@...nel.org,
	len.brown@...el.com, rjw@...k.pl, mingo@...e.hu, gregkh@...e.de,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [191/275] x86: Emit "mem=nopentium ignored" warning when not supported

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Kamal Mostafa <kamal@...onical.com>

commit 9a6d44b9adb777ca9549e88cd55bd8f2673c52a2 upstream.

Emit warning when "mem=nopentium" is specified on any arch other
than x86_32 (the only that arch supports it).

Signed-off-by: Kamal Mostafa <kamal@...onical.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
BugLink: http://bugs.launchpad.net/bugs/553464
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Len Brown <len.brown@...el.com>
Cc: Rafael J. Wysocki <rjw@...k.pl>
LKML-Reference: <1296783486-23033-2-git-send-email-kamal@...onical.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/e820.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: linux-2.6.35.y/arch/x86/kernel/e820.c
===================================================================
--- linux-2.6.35.y.orig/arch/x86/kernel/e820.c	2011-03-29 23:03:02.252242542 -0700
+++ linux-2.6.35.y/arch/x86/kernel/e820.c	2011-03-29 23:03:02.270242081 -0700
@@ -980,12 +980,15 @@
 	if (!p)
 		return -EINVAL;
 
-#ifdef CONFIG_X86_32
 	if (!strcmp(p, "nopentium")) {
+#ifdef CONFIG_X86_32
 		setup_clear_cpu_cap(X86_FEATURE_PSE);
 		return 0;
-	}
+#else
+		printk(KERN_WARNING "mem=nopentium ignored! (only supported on x86_32)\n");
+		return -EINVAL;
 #endif
+	}
 
 	userdef = 1;
 	mem_size = memparse(p, &p);
--
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