From 6377977485f7f9bdb994e57c4b2cd55345ff87ed Mon Sep 17 00:00:00 2001 From: Avadhut Naik Date: Fri, 13 Jun 2025 00:51:35 +0000 Subject: [PATCH] EDAC/amd64: Correct number of UMCs for family 19h models 70h-7fh commit b2e673ae53ef4b943f68585207a5f21cfc9a0714 upstream. AMD's Family 19h-based Models 70h-7fh support 4 unified memory controllers (UMC) per processor die. The amd64_edac driver, however, assumes only 2 UMCs are supported since max_mcs variable for the models has not been explicitly set to 4. The same results in incomplete or incorrect memory information being logged to dmesg by the module during initialization in some instances. Fixes: 6c79e42169fe ("EDAC/amd64: Add support for ECC on family 19h model 60h-7Fh") Closes: https://lore.kernel.org/all/27dc093f-ce27-4c71-9e81-786150a040b6@reox.at/ Reported-by: reox Signed-off-by: Avadhut Naik Signed-off-by: Borislav Petkov (AMD) Cc: stable@kernel.org Link: https://lore.kernel.org/20250613005233.2330627-1-avadhut.naik@amd.com Signed-off-by: Greg Kroah-Hartman --- drivers/edac/amd64_edac.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c index 9cd86390a167..10119cf27ffd 100644 --- a/drivers/edac/amd64_edac.c +++ b/drivers/edac/amd64_edac.c @@ -4130,6 +4130,7 @@ static int per_family_init(struct amd64_pvt *pvt) break; case 0x70 ... 0x7f: pvt->ctl_name = "F19h_M70h"; + pvt->max_mcs = 4; pvt->flags.zn_regs_v2 = 1; break; case 0xa0 ... 0xaf: