[PATCH AUTOSEL 4.19 150/191] EDAC: Raise the maximum number of memory controllers

Sasha Levin
2019-11-10T03:08:25Z

From: Justin Ernst <justin.ernst@hpe.com>

[ 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@hpe.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Russ Anderson <russ.anderson@hpe.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac@vger.kernel.org
Link: https://lkml.kernel.org/r/20180925143449.284634-1-justin.ernst@hpe.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 bffb97828ed67..958d69332c1d5 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

@@ -670,6 +671,6 @@ 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