Patch "x86/mce/AMD: Give a name to MCA bank 3 when accessed with legacy MSRs" has been added to the 4.4-stable tree

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

x86/mce/AMD: Give a name to MCA bank 3 when accessed with legacy MSRs

to the 4.4-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-amd-give-a-name-to-mca-bank-3-when-accessed-with-legacy-msrs.patch
and it can be found in the queue-4.4 subdirectory.

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

From: Yazen Ghannam <[email protected]>
Date: Thu, 30 Mar 2017 13:17:14 +0200
Subject: x86/mce/AMD: Give a name to MCA bank 3 when accessed with legacy MSRs

From: Yazen Ghannam <[email protected]>

commit 29f72ce3e4d18066ec75c79c857bee0618a3504b upstream.

MCA bank 3 is reserved on systems pre-Fam17h, so it didn't have a name. However, MCA bank 3 is defined on Fam17h systems and can be accessed using legacy MSRs. Without a name we get a stack trace on Fam17h systems when trying to register sysfs files for bank 3 on kernels that don't recognize Scalable MCA.

Call MCA bank 3 "decode_unit" since this is what it represents on Fam17h. This will allow kernels without SMCA support to see this bank on Fam17h+ and prevent the stack trace. This will not affect older systems since this bank is reserved on them, i.e. it'll be ignored.

Tested on AMD Fam15h and Fam17h systems.

  WARNING: CPU: 26 PID: 1 at lib/kobject.c:210 kobject_add_internal
  kobject: (ffff88085bb256c0): attempted to be registered with empty name!
  ...
  Call Trace:
   kobject_add_internal
   kobject_add
   kobject_create_and_add
   threshold_create_device
   threshold_init_device

---
 arch/x86/kernel/cpu/mcheck/mce_amd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -53,7 +53,7 @@ static const char * const th_names[] = {
 	"load_store",
 	"insn_fetch",
 	"combined_unit",
-	"",
+	"decode_unit",
 	"northbridge",
 	"execution_unit",
 };

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

queue-4.4/x86-mce-amd-give-a-name-to-mca-bank-3-when-accessed-with-legacy-msrs.patch