[PATCH AUTOSEL 4.14 080/109] EDAC: Raise the maximum number of memory controllers

[Sasha Levin]

From: Justin Ernst <justin.ernst@xxxxxxx>

[ 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 <justin.ernst@xxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Acked-by: Russ Anderson <russ.anderson@xxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: linux-edac@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20180925143449.284634-1-justin.ernst@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 include/linux/edac.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/edac.h b/include/linux/edac.h
index cd75c173fd00b..90f72336aea66 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>
 
 #define EDAC_DEVICE_NAME_LEN	31
 
@@ -667,6 +668,6 @@ 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
-- 
2.20.1