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From: "Elliott, Robert (Servers)" <elliott@hpe.com>
To: "Mateusz Jończyk" <mat.jonczyk@o2.pl>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Yinghai Lu <yinghai@kernel.org>,
	"Randy Dunlap" <rdunlap@infradead.org>
Subject: RE: [PATCH v2 01/10] x86/Kconfig: enable X86_X2APIC by default and improve help text
Date: Thu, 27 Oct 2022 14:45:54 +0000	[thread overview]
Message-ID: <MW5PR84MB18424DF86AE0D9B60994A38BAB339@MW5PR84MB1842.NAMPRD84.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20220911084711.13694-2-mat.jonczyk@o2.pl>

> As many current platforms (most modern Intel CPUs and QEMU) have x2APIC
> present, enable CONFIG_X86_X2APIC by default as it gives performance
> and functionality benefits. Additionally, if the BIOS has already
> switched APIC to x2APIC mode, but CONFIG_X86_X2APIC is disabled, the
> kernel will panic in arch/x86/kernel/apic/apic.c .
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> @@ -440,15 +440,27 @@ config X86_FEATURE_NAMES
>  	  If in doubt, say Y.
> 
>  config X86_X2APIC
> -	bool "Support x2apic"
> +	bool "x2APIC interrupt controller architecture support"
>  	depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP ||
> HYPERVISOR_GUEST)
> +	default y

Could this option be added to
	arch/x86/configs/x86_64_defconfig

so defconfig builds don't crash on current platforms?


  parent reply	other threads:[~2022-10-27 14:46 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-11  8:47 [PATCH v2 00/10] x86: Kconfig cleanups and help text improvements Mateusz Jończyk
2022-09-11  8:47 ` [PATCH v2 01/10] x86/Kconfig: enable X86_X2APIC by default and improve help text Mateusz Jończyk
2022-10-26 18:38   ` Borislav Petkov
2022-12-01 15:11     ` Thomas Gleixner
2022-10-27 14:45   ` Elliott, Robert (Servers) [this message]
2022-10-27 15:07     ` Dave Hansen
2022-11-03 23:41       ` Elliott, Robert (Servers)
2022-11-04 17:29         ` Dave Hansen
2024-02-02 14:08   ` David Heidelberg
2024-02-15 21:10     ` Mateusz Jończyk
2024-02-20 16:26       ` David Heidelberg
2024-07-05 22:28       ` David Heidelberg
2022-09-11  8:47 ` [PATCH v2 02/10] x86/apic: fix panic message when x2APIC is not supported Mateusz Jończyk
2022-10-27 15:08   ` Elliott, Robert (Servers)
2022-09-11  8:47 ` [PATCH v2 03/10] x86/Kconfig: always enable ARCH_SPARSEMEM_ENABLE Mateusz Jończyk
2022-09-11  8:47 ` [PATCH v2 04/10] x86/Kconfig: drop X86_32_NON_STANDARD Mateusz Jończyk
2022-09-11  8:47 ` [PATCH v2 05/10] x86/Kconfig: move all X86_EXTENDED_PLATFORM options together Mateusz Jończyk
2022-09-11  8:47 ` [PATCH v2 06/10] x86/Kconfig: update lists in X86_EXTENDED_PLATFORM Mateusz Jończyk
2022-09-11  8:47 ` [PATCH v2 07/10] x86/Kconfig: document CONFIG_PCI_MMCONFIG Mateusz Jończyk
2022-09-11  8:47 ` [PATCH v2 08/10] x86/Kconfig: make CONFIG_PCI_CNB20LE_QUIRK depend on X86_32 Mateusz Jończyk
2022-09-13 22:50   ` Bjorn Helgaas
2022-09-11  8:47 ` [PATCH v2 09/10] x86/Kconfig: document release year of glibc 2.3.3 Mateusz Jończyk
2022-09-11  8:47 ` [PATCH v2 10/10] x86/Kconfig: remove CONFIG_ISA_BUS Mateusz Jończyk

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