x86: Emit "mem=nopentium ignored" warning when not supported

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@canonical.com>
BugLink: http://bugs.launchpad.net/bugs/553464
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Len Brown <len.brown@intel.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
LKML-Reference: <1296783486-23033-2-git-send-email-kamal@canonical.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 663fad5e524e44ada3cf7fc352c6d71b0d58f1d2..d54f0a4d6c609221223fe444940407e2ff472784 100644 (file)
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -846,12 +846,15 @@ 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);