linux-kernel - [PATCH v2 08/10] x86/Kconfig: Implement custom CC_CAN

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Message-Id: <20251014-kbuild-userprogs-bits-v2-8-faeec46e887a@linutronix.de>
Date: Tue, 14 Oct 2025 15:05:23 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Nathan Chancellor <nathan@...nel.org>, 
 Nicolas Schier <nicolas.schier@...ux.dev>, Nicolas Schier <nsc@...nel.org>, 
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, 
 Alexander Gordeev <agordeev@...ux.ibm.com>, 
 Christian Borntraeger <borntraeger@...ux.ibm.com>, 
 Sven Schnelle <svens@...ux.ibm.com>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Masahiro Yamada <masahiroy@...nel.org>, linux-riscv@...ts.infradead.org, 
 linux-s390@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
 linux-mips@...r.kernel.org, sparclinux@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 08/10] x86/Kconfig: Implement custom CC_CAN_LINK

The generic CC_CAN_LINK detection does not work for all architectures.
To make it clearer how the detection works on x86 create an
architecture-specific variant.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/x86/Kconfig | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fa3b616af03a2d50eaf5f922bc8cd4e08a284045..a98675cd01c0c27e2a5716fb6d051416ddcc956f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -73,6 +73,7 @@ config X86
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
 	select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
 	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI
+	select ARCH_HAS_CC_CAN_LINK
 	select ARCH_HAS_CPU_ATTACK_VECTORS	if CPU_MITIGATIONS
 	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
@@ -3171,6 +3172,16 @@ config HAVE_ATOMIC_IOMAP
 	def_bool y
 	depends on X86_32

+config ARCH_CC_CAN_LINK
+	bool
+	default $(cc_can_link_user,-m64) if 64BIT
+	default $(cc_can_link_user,-m32)
+
+config ARCH_USERFLAGS
+	string
+	default "-m64" if 64BIT
+	default "-m32"
+
 source "arch/x86/kvm/Kconfig"

 source "arch/x86/Kconfig.cpufeatures"

-- 
2.51.0