x86: improve MTRR trimming messages

improve the MTTR trimming messages and also trigger a WARN_ON()
so that kerneloops.org can pick it up and categorize it.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index ac4b633..7159195 100644 (file)
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -706,20 +706,17 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
 
        /* kvm/qemu doesn't have mtrr set right, don't trim them all */
        if (!highest_addr) {
-               printk(KERN_WARNING "***************\n");
-               printk(KERN_WARNING "**** WARNING: likely strange cpu\n");
-               printk(KERN_WARNING "**** MTRRs all blank, cpu in qemu?\n");
-               printk(KERN_WARNING "***************\n");
+               printk(KERN_WARNING "WARNING: strange, CPU MTRRs all blank?\n");
+               WARN_ON(1);
                return 0;
        }
 
        if ((highest_addr >> PAGE_SHIFT) < end_pfn) {
-               printk(KERN_WARNING "***************\n");
-               printk(KERN_WARNING "**** WARNING: likely BIOS bug\n");
-               printk(KERN_WARNING "**** MTRRs don't cover all of "
-                      "memory, trimmed %ld pages\n", end_pfn -
-                      (highest_addr >> PAGE_SHIFT));
-               printk(KERN_WARNING "***************\n");
+               printk(KERN_WARNING "WARNING: BIOS bug: CPU MTRRs don't cover"
+                       " all of memory, losing %LdMB of RAM.\n",
+                       (((u64)end_pfn << PAGE_SHIFT) - highest_addr) >> 20);
+
+               WARN_ON(1);
 
                printk(KERN_INFO "update e820 for mtrr\n");
                trim_start = highest_addr;