[PATCH v7 052/120] x86/microcode/intel: Explain CPUID parser APIs unavailability

intel_cpuid_vfm() is defined so that it can be used before cpuinfo_x86
structures are populated.

Explain why it should not use the CPUID parser APIs as well.

Signed-off-by: Ahmed S. Darwish <[email protected]>
---
 arch/x86/kernel/cpu/microcode/intel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 18d2eff7a4b7..a3d0f8197d4d 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -123,8 +123,8 @@ static inline unsigned int exttable_size(struct extended_sigtable *et)
 
 
 /*
- * Use CPUID to generate a "vfm" value. Useful before cpuinfo_x86
- * structures are populated.
+ * Use a direct CPUID query to generate a "vfm" value. To be used before
+ * the CPUID parser is initialized; e.g. head's load_ucode_bsp() stage.
  */
 static u32 intel_cpuid_vfm(void)
 {
-- 
2.54.0