[patch V4 14/30] x86/microcode/amd: Read revision from hardware in collect_cpu_info_amd()

[Thomas Gleixner <tglx@linutronix.de>]

Prepare to decrapify the core initialization logic which invokes
microcode_ops::apply_microcode() several times just to set
cpu_data::microcode.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: New patch
---
 arch/x86/kernel/cpu/microcode/amd.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -634,12 +634,12 @@ void reload_ucode_amd(unsigned int cpu)
 
 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 {
-	struct cpuinfo_x86 *c = &cpu_data(cpu);
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+	u32 dummy __always_unused;
 	struct ucode_patch *p;
 
 	csig->sig = cpuid_eax(0x00000001);
-	csig->rev = c->microcode;
+	rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
 
 	/*
 	 * a patch could have been loaded early, set uci->mc so that