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From:   "H. Peter Anvin" <hpa@zytor.com>
To:     Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>,
        Andy Lutomirski <luto@kernel.org>
Cc:     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>,
        "H. Peter Anvin (Intel)" <hpa@zytor.com>
Subject: [PATCH 6/6] x86/irq: remove unused vectors from <asm/irq_vectors.h>
Date:   Mon, 10 May 2021 17:55:31 -0700
Message-Id: <20210511005531.1065536-7-hpa@zytor.com>
In-Reply-To: <20210511005531.1065536-1-hpa@zytor.com>
References: <20210511005531.1065536-1-hpa@zytor.com>
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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