linux-kernel - [tip: x86/urgent] x86/bugs: Qualify RETBLEED_INTEL

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Message-ID: <176104294615.2601451.15528695828339283083.tip-bot2@tip-bot2>
Date: Tue, 21 Oct 2025 10:35:46 -0000
From: "tip-bot2 for David Kaplan" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: David Kaplan <david.kaplan@....com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/bugs: Qualify RETBLEED_INTEL_MSG

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     204ced4108f5d38f6804968fd9543cc69c3f8da6
Gitweb:        https://git.kernel.org/tip/204ced4108f5d38f6804968fd9543cc69c3f8da6
Author:        David Kaplan <david.kaplan@....com>
AuthorDate:    Fri, 03 Oct 2025 12:19:36 -05:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Tue, 21 Oct 2025 12:32:28 +02:00

x86/bugs: Qualify RETBLEED_INTEL_MSG

When retbleed mitigation is disabled, the kernel already prints an info
message that the system is vulnerable.  Recent code restructuring also
inadvertently led to RETBLEED_INTEL_MSG being printed as an error, which is
unnecessary as retbleed mitigation was already explicitly disabled (by config
option, cmdline, etc.).

Qualify this print statement so the warning is not printed unless an actual
retbleed mitigation was selected and is being disabled due to incompatibility
with spectre_v2.

Fixes: e3b78a7ad5ea ("x86/bugs: Restructure retbleed mitigation")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220624
Signed-off-by: David Kaplan <david.kaplan@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://patch.msgid.link/20251003171936.155391-1-david.kaplan@amd.com
---
 arch/x86/kernel/cpu/bugs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 6a526ae..e08de5b 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1463,7 +1463,9 @@ static void __init retbleed_update_mitigation(void)
 			break;
 		default:
 			if (retbleed_mitigation != RETBLEED_MITIGATION_STUFF) {
-				pr_err(RETBLEED_INTEL_MSG);
+				if (retbleed_mitigation != RETBLEED_MITIGATION_NONE)
+					pr_err(RETBLEED_INTEL_MSG);
+
 				retbleed_mitigation = RETBLEED_MITIGATION_NONE;
 			}
 		}