[PATCH] Re: Dmesg: Use a PAE enabled kernel

[Roland Dreier]

How about something like the following (untested) patch?

This is against 2.5 but will probably apply with offset to 2.4.

 - Roland

--- 1.71/arch/i386/kernel/setup.c	Thu Feb 27 16:10:55 2003
+++ edited/arch/i386/kernel/setup.c	Wed Mar 12 12:54:42 2003
@@ -634,8 +634,11 @@
 		max_low_pfn = MAXMEM_PFN;
 #ifndef CONFIG_HIGHMEM
 		/* Maximum memory usable is what is directly addressable */
-		printk(KERN_WARNING "Warning only %ldMB will be used.\n",
-					MAXMEM>>20);
+		printk(KERN_WARNING "WARNING: only %ldMB can be addressed.\n"
+                       "%ldMB of RAM is inaccessible and will not be used.\n",
+		       MAXMEM >> 20,
+		       PAGE_SHIFT < 20 ? (max_pfn - MAXMEM_PFN) >> (20 - PAGE_SHIFT)
+				       : (max_pfn - MAXMEM_PFN) << (PAGE_SHIFT - 20));
 		if (max_pfn > MAX_NONPAE_PFN)
 			printk(KERN_WARNING "Use a PAE enabled kernel.\n");
 		else
@@ -644,9 +647,12 @@
 #else /* !CONFIG_HIGHMEM */
 #ifndef CONFIG_X86_PAE
 		if (max_pfn > MAX_NONPAE_PFN) {
-			max_pfn = MAX_NONPAE_PFN;
-			printk(KERN_WARNING "Warning only 4GB will be used.\n");
+			printk(KERN_WARNING "WARNING: only 4GB can be addressed.\n"
+			       "%ldMB of RAM is inaccessible and will not be used.\n",
+			       PAGE_SHIFT < 20 ? (max_pfn - MAX_NONPAE_PFN) >> (20 - PAGE_SHIFT)
+					       : (max_pfn - MAX_NONPAE_PFN) << (PAGE_SHIFT - 20));
 			printk(KERN_WARNING "Use a PAE enabled kernel.\n");
+			max_pfn = MAX_NONPAE_PFN;
 		}
 #endif /* !CONFIG_X86_PAE */
 #endif /* !CONFIG_HIGHMEM */