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>

1 files changed, 7 insertions, 10 deletions

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index ac4b6338f3f4..715919582657 100644
--- 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;