From: Alexey Starikovskiy <astarikovskiy@suse.de>
Date: Mon, 17 Mar 2008 19:08:24 +0000 (+0300)
Subject: x86: limit scan to 1k of EBDA.
X-Git-Tag: v2.6.26-rc1~1154^2~318
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85e46035bec6f114ad07ce8a9c70388568b1afd4;p=linux-2.6

x86: limit scan to 1k of EBDA.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/mpparse_64.c b/arch/x86/kernel/mpparse_64.c
index fb74135f9d..19c8264855 100644
--- a/arch/x86/kernel/mpparse_64.c
+++ b/arch/x86/kernel/mpparse_64.c
@@ -640,11 +640,13 @@ static void __init __find_smp_config(unsigned reserve)
 	 * trustworthy, simply because the SMP table may have been
 	 * stomped on during early boot. These loaders are buggy and
 	 * should be fixed.
+	 *
+	 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 	 */
 
 	address = get_bios_ebda();
 	if (address)
-		smp_scan_config(address, 0x1000, reserve);
+		smp_scan_config(address, 0x400, reserve);
 }
 
 void __init early_find_smp_config(void)