x86: Don't continue booting if we can't load the specified initrd

If we've determined we can't do what the user asked, trying to do
something else isn't going to make the user's life better.

Without this the screen scrolls a bit and then you get a panic
anyway, and it's nice not to have so much scroll after the real
problem in bug reports.

Link: http://lkml.kernel.org/r/1337190206-12121-1-git-send-email-pjones@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 1a29015..37ef116 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -393,10 +393,9 @@
 	initrd_start = 0;
 
 	if (ramdisk_size >= (end_of_lowmem>>1)) {
-		memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
-		printk(KERN_ERR "initrd too large to handle, "
-		       "disabling initrd\n");
-		return;
+		panic("initrd too large to handle, "
+		       "disabling initrd (%lld needed, %lld available)\n",
+		       ramdisk_size, end_of_lowmem>>1);
 	}
 
 	printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,