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Only four have ever been implemented, and newer products document this as MCA_SYND_UMC[1:0] = Chip Select. Since only four csrows are allocated, a syndrome with bit 2 set decodes to an out-of-range csrow and trips: EDAC MC0: INTERNAL ERROR: csrow value is out of range (5 >= 4) Mask with 0x3 to match the four implemented chip selects. Suggested-by: Yazen Ghannam Signed-off-by: Vishal Badole --- drivers/edac/amd64_edac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c index cab696be4f07..b69c3f51dd37 100644 --- a/drivers/edac/amd64_edac.c +++ b/drivers/edac/amd64_edac.c @@ -2802,7 +2802,7 @@ static inline void decode_bus_error(int node_id, struct mce *m) static void umc_get_err_info(struct mce *m, struct err_info *err) { err->channel = (m->ipid & GENMASK(31, 0)) >> 20; - err->csrow = m->synd & 0x7; + err->csrow = m->synd & 0x3; } static void decode_umc_error(int node_id, struct mce *m) -- 2.34.1