diff --git a/sys/compat/linuxkpi/common/include/asm/processor.h b/sys/compat/linuxkpi/common/include/asm/processor.h
--- a/sys/compat/linuxkpi/common/include/asm/processor.h
+++ b/sys/compat/linuxkpi/common/include/asm/processor.h
@@ -51,6 +51,7 @@
 	uint16_t	x86_clflush_size;
 	uint16_t	x86_max_cores;
 	uint8_t		x86_vendor;
+	uint8_t		x86_stepping;
 };
 
 extern struct cpuinfo_x86	boot_cpu_data;
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -2907,6 +2907,7 @@
 	boot_cpu_data.x86 = CPUID_TO_FAMILY(cpu_id);
 	boot_cpu_data.x86_model = CPUID_TO_MODEL(cpu_id);
 	boot_cpu_data.x86_vendor = x86_vendor;
+	boot_cpu_data.x86_stepping = CPUID_TO_STEPPING(cpu_id);
 
 	__cpu_data = kmalloc_array(mp_maxid + 1,
 	    sizeof(*__cpu_data), M_WAITOK | M_ZERO);