x86: fix more non-global TLB flushes

fix more __flush_tlb() instances, out of caution.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/head64.c

@@ -27,7 +27,7 @@ static void __init zap_identity_mappings(void)
 {
 	pgd_t *pgd = pgd_offset_k(0UL);
 	pgd_clear(pgd);
-	__flush_tlb();
+	__flush_tlb_all();
 }
 
 /* Don't add a printk in there. printk relies on the PDA which is not initialized