[patch 71/96] x86: tone down mtrr_trim_uncached_memory() warning

Greg KH
2009-03-14T00:43:36Z

[-- Attachment #1: x86-tone-down-mtrr_trim_uncached_memory-warning.patch --]
[-- Type: text/plain, Size: 1392 bytes --]

2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------

From: Ingo Molnar <mingo@elte.hu>

commit bf3647c44bc76c43c4b2ebb4c37a559e899ac70e upstream.

kerneloops.org is reporting a lot of these warnings that come due to
vmware not setting up any MTRRs for emulated CPUs:

| Reported 709 times (14696 total reports)
| BIOS bug (often in VMWare) where the MTRR's are set up incorrectly
| or not at all
|
| This warning was last seen in version 2.6.29-rc2-git1, and first
| seen in 2.6.24.
|
| More info:
| http://www.kerneloops.org/searchweek.php?search=mtrr_trim_uncached_memory

Keep a one-liner KERN_INFO about it - so that we have so notice if empty
MTRRs are caused by native hardware/BIOS weirdness.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/x86/kernel/cpu/mtrr/main.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -1496,8 +1496,7 @@ int __init mtrr_trim_uncached_memory(uns

/* kvm/qemu doesn't have mtrr set right, don't trim them all */
if (!highest_pfn) {
- WARN(!kvm_para_available(), KERN_WARNING
- "WARNING: strange, CPU MTRRs all blank?\n");
+ printk(KERN_INFO "CPU MTRRs all blank - virtualized system.\n");
return 0;
}