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 fb74135..19c8264 100644 (file)
--- 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)