[4.4,092/159] EDAC: Raise the maximum number of memory controllers

Commit Message

Greg Kroah-Hartman Nov. 22, 2019, 10:28 a.m. UTC

From: Justin Ernst <[e-mail]>

[ Upstream commit 6b58859419554fb824e09cfdd73151a195473cbc ]

We observe an oops in the skx_edac module during boot:

  EDAC MC0: Giving out device to module skx_edac controller Skylake Socket#0 IMC#0
  EDAC MC1: Giving out device to module skx_edac controller Skylake Socket#0 IMC#1
  EDAC MC2: Giving out device to module skx_edac controller Skylake Socket#1 IMC#0
  ...
  EDAC MC13: Giving out device to module skx_edac controller Skylake Socket#0 IMC#1
  EDAC MC14: Giving out device to module skx_edac controller Skylake Socket#1 IMC#0
  EDAC MC15: Giving out device to module skx_edac controller Skylake Socket#1 IMC#1
  Too many memory controllers: 16
  EDAC MC: Removed device 0 for skx_edac Skylake Socket#0 IMC#0

We observe there are two memory controllers per socket, with a limit
of 16. Raise the maximum number of memory controllers from 16 to 2 *
MAX_NUMNODES (1024).

[ bp: This is just a band-aid fix until we've sorted out the whole issue
  with the bus_type association and handling in EDAC and can get rid of
  this arbitrary limit. ]

Signed-off-by: Justin Ernst <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Acked-by: Russ Anderson <[e-mail]>
Cc: Mauro Carvalho Chehab <[e-mail]>
Cc: [e-mail]
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Sasha Levin <[e-mail]>
---
 include/linux/edac.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Patch

diff --git a/include/linux/edac.h b/include/linux/edac.h
index 4fe67b853de04..9bb4f3311e137 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -17,6 +17,7 @@ 
 #include <linux/completion.h>
 #include <linux/workqueue.h>
 #include <linux/debugfs.h>
+#include <linux/numa.h>
 
 struct device;
 
@@ -778,6 +779,6 @@  struct mem_ctl_info {
 /*
  * Maximum number of memory controllers in the coherent fabric.
  */
-#define EDAC_MAX_MCS	16
+#define EDAC_MAX_MCS	2 * MAX_NUMNODES
 
 #endif