From nobody Thu Dec 18 14:40:47 2025 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 DED2E253F35; Tue, 25 Mar 2025 07:36:12 +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=1742888174; cv=none; b=hxODYqqfzF6qC0O9hpfG6SVV3Yj2pF+kukcCQFXgtE4/Xdq/IVUgWk/Q9YM1OkX9Zcn29EGTO7WhXN5iWvUltHd8VfFoHaRVv6u7cjf1iuNDUXihsO18rVSV3Z9ZHjbUB8y2Vg1Rf0U+gL7YhVEkgD7zUl0tqwZwHbpfqF2rjB8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742888174; c=relaxed/simple; bh=XcJyY3wGKpcT423ocmHs5TJMHF+prodiNcMBActqDc4=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=FRXCWio9hCJaLz9LOa19ZglZfGTbDTOcOFtqsKvgiiBUiABhtNFm4mGh5tIXOz5f4vP4IK5o0gfgQfUiGjBrZHun7TGInvhFrOyiP3JG2t19ToWUHzGW/LwmV3tM1P5RReHkonddx90S2uT7lVXlZT9qPjyfO2TmVcuADL5XlEw= 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=cyMqqdtu; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Ujb+hZDE; 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="cyMqqdtu"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Ujb+hZDE" Date: Tue, 25 Mar 2025 07:36:10 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1742888171; h=from:from:sender:sender:reply-to: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: in-reply-to:in-reply-to:references:references; bh=Ez7An6mqQ0YdyzErr2athNp0PxN4F4F6r9ilmzYyhIc=; b=cyMqqdtul7YR/oHbNspvRS6kw61QHJwVrhScxsmJ7jnBrqwc2xj3GM4SVSFuXJvwi8iq0C 1xHvzNWoHKki+ljb7CVmspNQZsBXuelXNEhrcWx4Vk9LGXC2DghB3gCDNQYdHdB/06XbQY FHbWHZKF78SLU5jyzg7AI9j82E+kS2Cv5ukKid+iqmR+7QN7pIoPCuAALa5w5pcna/3BdQ PHieUHaQVgJLSmtvCFDMUpYClMDUjd8pKQ9SMzKygjRCV24PucY/pO9FPVuU7OhsB0v6u6 aUjWqqfDfPu9kI3E26NJYqzBgGTxeFK/pD6PocgoyQFHhw2m3uWULRw3Epg31g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1742888171; h=from:from:sender:sender:reply-to: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: in-reply-to:in-reply-to:references:references; bh=Ez7An6mqQ0YdyzErr2athNp0PxN4F4F6r9ilmzYyhIc=; b=Ujb+hZDEWs7JCQDdZ7Q/i3WmcdIPb3+USaYofJFjdhsS68aY8oCEhl6OJqrcP19nMUAEhY DRF8kunsG8T+seCA== From: tip-bot2 for Mateusz =?utf-8?q?Jo=C5=84czyk?= Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/urgent] x86/Kconfig: Document CONFIG_PCI_MMCONFIG Cc: mat.jonczyk@o2.pl, David Heideberg , Ingo Molnar , "H. Peter Anvin" , Linus Torvalds , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20250321-x86_x2apic-v3-5-b0cbaa6fa338@ixit.cz> References: <20250321-x86_x2apic-v3-5-b0cbaa6fa338@ixit.cz> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <174288817046.14745.11802846447168020418.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/urgent branch of tip: Commit-ID: 21d8fb8d4e7071b2e60bc48c217ff1b4ce8cb855 Gitweb: https://git.kernel.org/tip/21d8fb8d4e7071b2e60bc48c217ff1b4c= e8cb855 Author: Mateusz Jo=C5=84czyk AuthorDate: Fri, 21 Mar 2025 21:48:47 +01:00 Committer: Ingo Molnar CommitterDate: Sat, 22 Mar 2025 08:08:20 +01:00 x86/Kconfig: Document CONFIG_PCI_MMCONFIG This configuration option had no help text, so add it. CONFIG_EXPERT is enabled on some distribution kernels, so people using a distribution kernel's configuration as a starting point will see this option. [ mingo: Standardized the new Kconfig text a bit. ] Signed-off-by: Mateusz Jo=C5=84czyk Signed-off-by: David Heideberg Signed-off-by: Ingo Molnar Cc: "H. Peter Anvin" Cc: Linus Torvalds Link: https://lore.kernel.org/r/20250321-x86_x2apic-v3-5-b0cbaa6fa338@ixit.= cz --- arch/x86/Kconfig | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 917cd2f..a079ecf 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2902,6 +2902,19 @@ config PCI_MMCONFIG default y depends on PCI && (ACPI || JAILHOUSE_GUEST) depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG) + help + Add support for accessing the PCI configuration space as a memory + mapped area. It is the recommended method if the system supports + this (it must have PCI Express and ACPI for it to be available). + + In the unlikely case that enabling this configuration option causes + problems, the mechanism can be switched off with the 'pci=3Dnommconf' + command line parameter. + + Say N only if you are sure that your platform does not support this + access method or you have problems caused by it. + + Say Y otherwise. =20 config PCI_OLPC def_bool y