linux-kernel - [PATCH] EDAC/mce_amd: Reduce unnecessary spew in dmesg if SMCA feature bit is not exposed

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Date:   Mon, 14 Jun 2021 16:21:29 -0500
From:   Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-edac@...r.kernel.org
Cc:     Tony Luck <tony.luck@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        James Morse <james.morse@....com>, yazen.ghannam@....com,
        Robert Richter <rric@...nel.org>,
        Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Subject: [PATCH] EDAC/mce_amd: Reduce unnecessary spew in dmesg if SMCA feature bit is not exposed

The SMCA feature bit is not exposed on the guest.

This causes a lot of noise in dmesg as the warning is printed for each
logical CPU.

$ dmesg |grep -i family

[    0.031000] smpboot: CPU0: AMD EPYC-Milan Processor (family: 0x19, model: 0x1, stepping: 0x1)
[    4.653422] Huh? What family is it: 0x19?!
[    4.720732] Huh? What family is it: 0x19?!
[    6.171028] Huh? What family is it: 0x19?!
[    6.766552] Huh? What family is it: 0x19?!
[    6.811119] Huh? What family is it: 0x19?!
[    6.839855] Huh? What family is it: 0x19?!

Give these messages debug severity and output once as it is mostly useful
for module developers and just noise for users.

Rephrase the statement to make it more meaningful.

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
---
 drivers/edac/mce_amd.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 5dd905a3f30c..2a9899088389 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -1227,13 +1227,9 @@ static int __init mce_amd_init(void)
 		fam_ops.mc2_mce = f16h_mc2_mce;
 		break;
 
-	case 0x17:
-	case 0x18:
-		pr_warn_once("Decoding supported only on Scalable MCA processors.\n");
-		return -EINVAL;
-
 	default:
-		printk(KERN_WARNING "Huh? What family is it: 0x%x?!\n", c->x86);
+		pr_debug_once("MCE decoding is not supported for family: 0x%x\n",
+			      c->x86);
 		return -EINVAL;
 	}
 
-- 
2.17.1