linux-kernel - [PATCH v4 22/24] EDAC/amd64: Match hash function to reference code

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Date:   Thu, 27 Jan 2022 20:41:13 +0000
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     <linux-edac@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <bp@...en8.de>,
        <mchehab@...nel.org>, <tony.luck@...el.com>, <james.morse@....com>,
        <rric@...nel.org>, <Smita.KoralahalliChannabasappa@....com>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v4 22/24] EDAC/amd64: Match hash function to reference code

The reference code for DF2 hashing was changed to XOR the interleave
address bit rather than the CS ID. Match that here.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lore.kernel.org/r/20211028175728.121452-28-yazen.ghannam@amd.com

v3->v4:
* No change.

v2->v3:
* Was patch 28 in v2.

v1->v2:
* Moved from arch/x86 to EDAC.

 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 e293aefd486e..601ececf5106 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1142,7 +1142,7 @@ static int dehash_addr_df2(struct addr_ctx *ctx)
 			(ctx->ret_addr >> 18) ^
 			(ctx->ret_addr >> 21) ^
 			(ctx->ret_addr >> 30) ^
-			ctx->cs_id;
+			(ctx->ret_addr >> ctx->intlv_addr_bit);
 
 	hashed_bit &= BIT(0);
 
-- 
2.25.1