Patch "x86/MCE: Save microcode revision in machine check records" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

x86/MCE: Save microcode revision in machine check records

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
x86-mce-save-microcode-revision-in-machine-check-records.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From fa94d0c6e0f3431523f5701084d799c77c7d4a4f Mon Sep 17 00:00:00 2001
From: Tony Luck <[email protected]>
Date: Tue, 6 Mar 2018 15:21:41 +0100
Subject: x86/MCE: Save microcode revision in machine check records

From: Tony Luck <[email protected]>

commit fa94d0c6e0f3431523f5701084d799c77c7d4a4f upstream.

Updating microcode used to be relatively rare. Now that it has become more common we should save the microcode version in a machine check record to make sure that those people looking at the error have this important information bundled with the rest of the logged information.

[ Borislav: Simplify a bit. ]

---
 arch/x86/include/uapi/asm/mce.h  |    1 +
 arch/x86/kernel/cpu/mcheck/mce.c |    4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/x86-mce-serialize-sysfs-changes.patch queue-4.15/x86-mce-save-microcode-revision-in-machine-check-records.patch --
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@@ -30,6 +30,7 @@ struct mce {
 	__u64 synd;	/* MCA_SYND MSR: only valid on SMCA systems */
 	__u64 ipid;	/* MCA_IPID MSR: only valid on SMCA systems */
 	__u64 ppin;	/* Protected Processor Inventory Number */
+	__u32 microcode;/* Microcode revision */
 };
 
 #define MCE_GET_RECORD_LEN   _IOR('M', 1, int)

@@ -131,6 +131,8 @@ void mce_setup(struct mce *m)
 
 	if (this_cpu_has(X86_FEATURE_INTEL_PPIN))
 		rdmsrl(MSR_PPIN, m->ppin);
+
+	m->microcode = boot_cpu_data.microcode;
 }
 
 DEFINE_PER_CPU(struct mce, injectm);

@@ -263,7 +265,7 @@ static void __print_mce(struct mce *m)
 	 */
 	pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x microcode %x\n",
 		m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid,
-		cpu_data(m->extcpu).microcode);
+		m->microcode);
 }
 
 static void print_mce(struct mce *m)