x86: do smp tainting checks in a separate function

It will ease integration for x86_64

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 19 insertions, 2 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 02427d1003d3..ddb94ef37789 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -45,10 +45,8 @@ unsigned char *trampoline_base = __va(SMP_TRAMPOLINE_BASE);
 /* representing cpus for which sibling maps can be computed */
 static cpumask_t cpu_sibling_setup_map;
 
-#ifdef CONFIG_X86_32
 /* Set if we find a B stepping CPU */
 int __cpuinitdata smp_b_stepping;
-#endif
 
 static void __cpuinit smp_apply_quirks(struct cpuinfo_x86 *c)
 {
@@ -105,6 +103,25 @@ valid_k7:
 #endif
 }
 
+void smp_checks(void)
+{
+        if (smp_b_stepping)
+                printk(KERN_WARNING "WARNING: SMP operation may be unreliable"
+                                    "with B stepping processors.\n");
+
+        /*
+         * Don't taint if we are running SMP kernel on a single non-MP
+         * approved Athlon
+         */
+        if (tainted & TAINT_UNSAFE_SMP) {
+                if (cpus_weight(cpu_present_map))
+                        printk(KERN_INFO "WARNING: This combination of AMD"
+                                "processors is not suitable for SMP.\n");
+                else
+                        tainted &= ~TAINT_UNSAFE_SMP;
+        }
+}
+
 /*
  * The bootstrap kernel entry code has set these up. Save them for
  * a given CPU