From nobody Tue Apr 7 02:56:25 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A7E63AEF4A for ; Mon, 16 Mar 2026 15:50:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773676223; cv=none; b=aCtAjTHT3sj51BOYuK7pVrwIZ8Pph9rMqAxW6f5lLsWEkSYYTjGVPy2x9sybhrqNBLw3uYA6ZIFKxtdmWy36iPjbSRjY81maDnrnsUAc8sItoxiQUDIgqT47lLNiSeXeoGmFIIDT/sOgG2K/lb8TZVw1/G7snlJrF0wQLBRAvRs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773676223; c=relaxed/simple; bh=By1cUpbNyNQcL9oRrQU1KPXNKs9U/u6dYDanvD3H72k=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=EX33uT3x/lqHCYSGXmQvbcEJ8Nok8pNhUsXjA/HbIk5d5sfAMASHNqyJb7IWd0euN2mUXaO5VMx3c5MYQHzcaBqPQCtNWGkJVAACG4QPOWsSAUPun8TaKWqROM9q84A8qeUkGhzjDfO8ss8hUlN4rLXP9pgxfmoLXINV2bAmaa8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=iT+Rma5o; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=7gc6P8FV; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="iT+Rma5o"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="7gc6P8FV" From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1773676217; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=PeebMGCkN6Ut3OlODEfjuwzGR0tecm17avWdzvEVYgs=; b=iT+Rma5o1XSmL/YeRQqnRpOqzpW5V9PS0f1vUShvCD1yjOTI3sKBOuukGbSMSpePZmQEOV nd4Kfr/v5FjEOqgCy3V9F2xr8sHQYsrnrC0+vMcDGYUoh8TnR7z05Q5E12+IHctXiPa6/x MbQYCEqjDllzm9ggLJnYNsCMBc0njZcEETGrGytcKGN4I4O/JlaI6XWg8euppU6KWBBUOX 26fNWHPqMDz6WT6Qc5V9KlahPg1NEa4yixYIIZNsGtCtZ4TRTEL0f+r9w+SXGG8Oh8sfcD lVVcITWC4/OH/FqdIikPb3FRu1XeSqmwP9WqVt4LfdBv7r1bVDHuwaQ1JWV0SQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1773676217; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=PeebMGCkN6Ut3OlODEfjuwzGR0tecm17avWdzvEVYgs=; b=7gc6P8FVEsBGHn12PurfyIlRA8Ow/r0LnGmo45lOCzuw12nDEmdvCxQv0pO4MAWY0vOkXS fbctquTwBJ5urpCg== Date: Mon, 16 Mar 2026 16:50:13 +0100 Subject: [PATCH v3] x86/Kconfig: Implement ARCH_HAS_CC_CAN_LINK Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260316-cc-can-link-x86-v3-1-d905140be392@linutronix.de> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/3XNwQ6CMAyA4VchO1tDqzD05HsYD2Mr0miG2ZBgC O/uIPGi8fi36ddJRQ7CUR2zSQUeJErnU+w2mbKt8VcGcakV5VQgEYG1YI2Hu/gbjFUJjdEGC2a 7d7VKV4/AjYyreL6kbiX2XXitDwZcpv+tAQGh1hbRaW0qh6e0evah8zJuHavFG+hjlDmR/jUoG c6wdo2t0eDh25jn+Q1nlKZF9gAAAA== X-Change-ID: 20251222-cc-can-link-x86-fa7a15eec4db To: Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Developer-Signature: v=1; a=ed25519-sha256; t=1773676217; l=1862; i=thomas.weissschuh@linutronix.de; s=20240209; h=from:subject:message-id; bh=By1cUpbNyNQcL9oRrQU1KPXNKs9U/u6dYDanvD3H72k=; b=ovNYWzg+4uPmyTjL+qGOxFr08BbRFpBTpMtSRp/cMoy4AJiju8EeiLYSaMjo1ZpVbohOs88Lb nVclacPa/+TBgKhW58YSMIL8jS5FXr61k8QY89JgVDR9H4Ti0SXh4h2 X-Developer-Key: i=thomas.weissschuh@linutronix.de; a=ed25519; pk=pfvxvpFUDJV2h2nY0FidLUml22uGLSjByFbM6aqQQws= The generic CC_CAN_LINK detection using -m32/-m64 does not work for all architectures and is going to be removed in favor of architecture-specific logic. Implement such an architecture specific detection for x86 which mirrors the existing generic implementation, as the generic implementation was tailored after x86 originally. Signed-off-by: Thomas Wei=C3=9Fschuh --- Changes in v3: - Rephrase commit message. - Link to v2: https://lore.kernel.org/r/20260227-cc-can-link-x86-v2-1-dae7d= fcb1a19@linutronix.de Changes in v2: - Rebase on v7.0-rc1 - Link to v1: https://lore.kernel.org/r/20251222-cc-can-link-x86-v1-1-b7c11= d77a8d1@linutronix.de --- arch/x86/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e2df1b147184..192b592b647c 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 @@ -3185,6 +3186,16 @@ config HAVE_ATOMIC_IOMAP def_bool y depends on X86_32 =20 +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" =20 source "arch/x86/Kconfig.cpufeatures" --- base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f change-id: 20251222-cc-can-link-x86-fa7a15eec4db Best regards, --=20 Thomas Wei=C3=9Fschuh