[PATCH] x86: minor tidying of identify_cpu()

[Jan Beulich <jbeulich@xxxxxxxx>]

Fields that generic_identify() sets unconditionally don't need pre-
setting. (In fact the compiler removes some of those assignments anyway,
at least in release builds.)

With the setting of ->cpuid_level to -1 gone, also drop the respective
BUG_ON() from default_init().

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -114,8 +114,6 @@ bool __init is_forced_cpu_cap(unsigned i
 static void cf_check default_init(struct cpuinfo_x86 * c)
 {
        /* Not much we can do here... */
-       /* Check if at least it has cpuid */
-       BUG_ON(c->cpuid_level == -1);
        __clear_bit(X86_FEATURE_SEP, c->x86_capability);
 }
 
@@ -492,15 +490,11 @@ void identify_cpu(struct cpuinfo_x86 *c)
        int i;
 
        c->x86_cache_size = -1;
-       c->x86_vendor = X86_VENDOR_UNKNOWN;
-       c->cpuid_level = -1;    /* CPUID not detected */
        c->x86_model = c->x86_mask = 0; /* So far unknown... */
-       c->x86_vendor_id[0] = '\0'; /* Unset */
        c->x86_model_id[0] = '\0';  /* Unset */
        c->x86_max_cores = 1;
        c->x86_num_siblings = 1;
        c->x86_clflush_size = 0;
-       c->phys_proc_id = XEN_INVALID_SOCKET_ID;
        c->cpu_core_id = XEN_INVALID_CORE_ID;
        c->compute_unit_id = INVALID_CUID;
        memset(&c->x86_capability, 0, sizeof c->x86_capability);