linux-kernel - [PATCH 2/2] x86: "mem=nopentium ignored" warning when not supported

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Date:	Thu,  3 Feb 2011 17:38:05 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	x86@...nel.org
Cc:	Kamal Mostafa <kamal@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] x86: "mem=nopentium ignored" warning when not supported

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

BugLink: http://bugs.launchpad.net/bugs/553464
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
Cc: <stable@...nel.org>
---
 arch/x86/kernel/e820.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 55a59d8..0429ad0 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -847,12 +847,16 @@ static int __init parse_memopt(char *p)
 	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);
-- 
1.7.1

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