patch-2.1.131 linux/arch/i386/mm/init.c

• Lines: 20
• Date: Fri Nov 27 12:46:56 1998
• Orig file: v2.1.130/linux/arch/i386/mm/init.c
• Orig date: Wed Sep 9 14:51:05 1998

diff -u --recursive --new-file v2.1.130/linux/arch/i386/mm/init.c linux/arch/i386/mm/init.c
@@ -293,11 +293,18 @@
 		 * extended bios data area. 
 		 *
 		 * there is a real-mode segmented pointer pointing to the
-		 * 4K EBDA area at 0x40E, calculate and scan it here:
+		 * 4K EBDA area at 0x40E, calculate and scan it here.
+		 *
+		 * NOTE! There are Linux loaders that will corrupt the EBDA
+		 * area, and as such this kind of SMP config may be less
+		 * trustworthy, simply because the SMP table may have been
+		 * stomped on during early boot.
 		 */
 		address = *(unsigned short *)phys_to_virt(0x40E);
 		address<<=4;
 		smp_scan_config(address, 0x1000);
+		if (smp_found_config)
+			printk(KERN_WARNING "WARNING: MP table in the EBDA can be UNSAFE, contact linux-smp@vger.rutgers.edu if you experience SMP problems!\n");
 	}
 #endif
 	start_mem = PAGE_ALIGN(start_mem);