From: Steve Wahl <steve.wahl@hpe.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Steve Wahl <steve.wahl@hpe.com>,
Mike Travis <mike.travis@hpe.com>,
Dimitri Sivanich <dimitri.sivanich@hpe.com>,
Russ Anderson <russ.anderson@hpe.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 6/6] x86/irq: remove unused vectors from <asm/irq_vectors.h>
Date: Tue, 11 May 2021 12:04:12 -0500 [thread overview]
Message-ID: <YJq5DKN4ZCJns2wr@swahl-home.5wahls.com> (raw)
In-Reply-To: <20210511005531.1065536-7-hpa@zytor.com>
Acked-by: Steve Wahl <steve.wahl@hpe.com>
Yes, we believe UV_BAU_MESSAGE is one we missed in some earlier code
cleanup, and agree with its removal.
On Mon, May 10, 2021 at 05:55:31PM -0700, H. Peter Anvin wrote:
> From: "H. Peter Anvin (Intel)" <hpa@zytor.com>
>
> UV_BAU_MESSAGE is defined but not used anywhere in the
> kernel. Presumably this is a stale vector number that can be
> reclaimed.
>
> MCE_VECTOR is not an actual vector: #MC is an exception, not an
> interrupt vector, and as such is correctly described as
> X86_TRAP_MC. MCE_VECTOR is not used anywhere is the kernel.
>
> Note that NMI_VECTOR *is* used; specifically it is the vector number
> programmed into the APIC LVT when an NMI interrupt is configured. At
> the moment it is always numerically identical to X86_TRAP_NMI, that is
> not necessarily going to be the case indefinitely.
>
> Cc: Steve Wahl <steve.wahl@hpe.com>
> Cc: Mike Travis <mike.travis@hpe.com>
> Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com>
> Cc: Russ Anderson <russ.anderson@hpe.com>
> Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
> ---
> arch/x86/include/asm/irq_vectors.h | 4 ++--
> tools/arch/x86/include/asm/irq_vectors.h | 4 ++--
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
> index d2ef35927770..43dcb9284208 100644
> --- a/arch/x86/include/asm/irq_vectors.h
> +++ b/arch/x86/include/asm/irq_vectors.h
> @@ -26,8 +26,8 @@
> * This file enumerates the exact layout of them:
> */
>
> +/* This is used as an interrupt vector when programming the APIC. */
> #define NMI_VECTOR 0x02
> -#define MCE_VECTOR 0x12
>
> /*
> * IDT vectors usable for external interrupt sources start at 0x20.
> @@ -84,7 +84,7 @@
> */
> #define IRQ_WORK_VECTOR 0xf6
>
> -#define UV_BAU_MESSAGE 0xf5
> +/* 0xf5 - unused, was UV_BAU_MESSAGE */
> #define DEFERRED_ERROR_VECTOR 0xf4
>
> /* Vector on which hypervisor callbacks will be delivered */
> diff --git a/tools/arch/x86/include/asm/irq_vectors.h b/tools/arch/x86/include/asm/irq_vectors.h
> index d2ef35927770..43dcb9284208 100644
> --- a/tools/arch/x86/include/asm/irq_vectors.h
> +++ b/tools/arch/x86/include/asm/irq_vectors.h
> @@ -26,8 +26,8 @@
> * This file enumerates the exact layout of them:
> */
>
> +/* This is used as an interrupt vector when programming the APIC. */
> #define NMI_VECTOR 0x02
> -#define MCE_VECTOR 0x12
>
> /*
> * IDT vectors usable for external interrupt sources start at 0x20.
> @@ -84,7 +84,7 @@
> */
> #define IRQ_WORK_VECTOR 0xf6
>
> -#define UV_BAU_MESSAGE 0xf5
> +/* 0xf5 - unused, was UV_BAU_MESSAGE */
> #define DEFERRED_ERROR_VECTOR 0xf4
>
> /* Vector on which hypervisor callbacks will be delivered */
> --
> 2.31.1
>
--
Steve Wahl, Hewlett Packard Enterprise
prev parent reply other threads:[~2021-05-11 17:04 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 0:55 [PATCH 0/6] x86/irq: trap and interrupt cleanups H. Peter Anvin
2021-05-11 0:55 ` [PATCH 1/6] x86/traps: add X86_NR_HW_TRAPS to <asm/trapnr.h> H. Peter Anvin
2021-05-14 22:53 ` Andy Lutomirski
2021-05-11 0:55 ` [PATCH 2/6] x86/irqvector: add NR_EXTERNAL_VECTORS and NR_SYSTEM_VECTORS H. Peter Anvin
2021-05-14 22:53 ` Andy Lutomirski
2021-05-11 0:55 ` [PATCH 3/6] x86/idt: remove address argument to idt_invalidate() H. Peter Anvin
2021-05-11 4:37 ` kernel test robot
2021-05-11 14:14 ` Thomas Gleixner
2021-05-11 14:43 ` H. Peter Anvin
2021-05-11 0:55 ` [PATCH 4/6] x86/irq: merge common code in DEFINE_IDTENTRY_SYSVEC[_SIMPLE] H. Peter Anvin
2021-05-11 14:22 ` Thomas Gleixner
2021-05-11 17:44 ` H. Peter Anvin
2021-05-12 8:38 ` Ingo Molnar
2021-05-12 18:00 ` H. Peter Anvin
2021-05-12 18:40 ` Ingo Molnar
2021-05-11 0:55 ` [PATCH 5/6] x86/irq: WARN_ONCE() if irq_move_cleanup is called on a pending interrupt H. Peter Anvin
2021-05-11 14:23 ` Thomas Gleixner
2021-05-11 15:55 ` H. Peter Anvin
2021-05-11 0:55 ` [PATCH 6/6] x86/irq: remove unused vectors from <asm/irq_vectors.h> H. Peter Anvin
2021-05-11 17:04 ` Steve Wahl [this message]
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