linux-kernel - [PATCH AUTOSEL 5.4 2/2] x86/amd_nb: Restrict init function to AMD-based systems

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Message-Id: <20250126145110.926175-2-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:51:10 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Yazen Ghannam <yazen.ghannam@....com>,
	Borislav Petkov <bp@...en8.de>,
	Sasha Levin <sashal@...nel.org>,
	tglx@...utronix.de,
	mingo@...hat.com,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	Shyam-sundar.S-k@....com,
	richard.gong@....com,
	mario.limonciello@....com
Subject: [PATCH AUTOSEL 5.4 2/2] x86/amd_nb: Restrict init function to AMD-based systems

From: Yazen Ghannam <yazen.ghannam@....com>

[ Upstream commit bee9e840609cc67d0a7d82f22a2130fb7a0a766d ]

The code implicitly operates on AMD-based systems by matching on PCI
IDs. However, the use of these IDs is going away.

Add an explicit CPU vendor check instead of relying on PCI IDs.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/20241206161210.163701-3-yazen.ghannam@amd.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/kernel/amd_nb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index e3b5de7b95988..ead78f981345c 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -538,6 +538,10 @@ static __init void fix_erratum_688(void)
 
 static __init int init_amd_nbs(void)
 {
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
+	    boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
+		return 0;
+
 	amd_cache_northbridges();
 	amd_cache_gart();
 
-- 
2.39.5