[XEN PATCH v4 2/3] x86/MCE: add default switch case in init_nonfatal_mce_checker()

[Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>]

The default switch case block is wanted here, to handle situation
e.g. of unexpected c->x86_vendor value -- then no mcheck init is done, but
misleading message still gets logged anyway.

Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
---
changes in v4:
 - return 0 instead of -ENODEV and put a comment
 - update description a bit
---
 xen/arch/x86/cpu/mcheck/non-fatal.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/arch/x86/cpu/mcheck/non-fatal.c 
b/xen/arch/x86/cpu/mcheck/non-fatal.c
index 33cacd15c2..5a53bcd0b7 100644
--- a/xen/arch/x86/cpu/mcheck/non-fatal.c
+++ b/xen/arch/x86/cpu/mcheck/non-fatal.c
@@ -29,9 +29,14 @@ static int __init cf_check init_nonfatal_mce_checker(void)
                /* Assume we are on K8 or newer AMD or Hygon CPU here */
                amd_nonfatal_mcheck_init(c);
                break;
+
        case X86_VENDOR_INTEL:
                intel_nonfatal_mcheck_init(c);
                break;
+
+       default:
+               /* unhandled vendor isn't really an error */
+               return 0;
        }
        printk(KERN_INFO "mcheck_poll: Machine check polling timer started.\n");
        return 0;
-- 
2.25.1