x86/cpu: Use cpu_feature_enabled() when checking global pages support

X86_FEATURE_PGE determines whether the CPU has enabled global page
translations support. Use the faster cpu_feature_enabled() check to
shave off some more cycles when flushing all TLB entries, including the
global ones.

What this practically saves is:

   mov    0x82eb308(%rip),%rax        # 0xffffffff8935bec8 <boot_cpu_data+40>
   test   $0x20,%ah

... which test the bit. Not a lot, but TLB flushing is a timing-sensitive
path, so anything to make it even faster.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: bp3tk0v

arch/x86/mm/tlb.c

@@ -1205,7 +1205,7 @@ void __flush_tlb_all(void)
 	 */
 	VM_WARN_ON_ONCE(preemptible());
 
-	if (boot_cpu_has(X86_FEATURE_PGE)) {
+	if (cpu_feature_enabled(X86_FEATURE_PGE)) {
 		__flush_tlb_global();
 	} else {
 		/*