linux-kernel - [PATCH v3 10/10] x86: only allow EISA for 32-bit

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Message-Id: <20250226213714.4040853-11-arnd@kernel.org>
Date: Wed, 26 Feb 2025 22:37:14 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Shevchenko <andy@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	"Maciej W. Rozycki" <macro@...am.me.uk>
Subject: [PATCH v3 10/10] x86: only allow EISA for 32-bit

From: Arnd Bergmann <arnd@...db.de>

The CONFIG_EISA menu was cleaned up in 2018, but this inadvertently
brought the option back on 64-bit machines: ISA remains guarded by
a CONFIG_X86_32 check, but EISA no longer depends on ISA.

The last Intel machines ith EISA support used a 82375EB PCI/EISA bridge
from 1993 that could be paired with the 440FX chipset on early Pentium-II
CPUs, long before the first x86-64 products.

Fixes: 6630a8e50105 ("eisa: consolidate EISA Kconfig entry in drivers/eisa")
Cc: "Maciej W. Rozycki" <macro@...am.me.uk>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 14dd7b5abd5d..f84a9e5dda20 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -232,7 +232,7 @@ config X86
 	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI	if X86_64
 	select HAVE_EBPF_JIT
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
-	select HAVE_EISA
+	select HAVE_EISA			if X86_32
 	select HAVE_EXIT_THREAD
 	select HAVE_GUP_FAST
 	select HAVE_FENTRY			if X86_64 || DYNAMIC_FTRACE
-- 
2.39.5