From: "Xin Li (Intel)" <xin@zytor.com>
To: linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com
Subject: [PATCH v1 1/1] x86/nmi: Remove an unnecessary IS_ENABLED(CONFIG_SMP)
Date: Thu, 1 Feb 2024 01:46:04 -0800 [thread overview]
Message-ID: <20240201094604.3918141-1-xin@zytor.com> (raw)
IS_ENABLED(CONFIG_SMP) is unnecessary here: smp_processor_id() should
always return zero on UP, and arch_cpu_is_offline() reduces to
!(cpu == 0), so this is a statically false condition on UP.
Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li (Intel) <xin@zytor.com>
---
arch/x86/kernel/nmi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index db1c1848a1e6..6ba713406262 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -503,7 +503,7 @@ DEFINE_IDTENTRY_RAW(exc_nmi)
if (IS_ENABLED(CONFIG_NMI_CHECK_CPU))
raw_atomic_long_inc(&nsp->idt_calls);
- if (IS_ENABLED(CONFIG_SMP) && arch_cpu_is_offline(smp_processor_id())) {
+ if (arch_cpu_is_offline(smp_processor_id())) {
if (microcode_nmi_handler_enabled())
microcode_offline_nmi_handler();
return;
base-commit: b2803076903a83ea927c7f34deeaddf75ee38679
--
2.43.0
next reply other threads:[~2024-02-01 9:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-01 9:46 Xin Li (Intel) [this message]
2024-02-27 21:10 ` [tip: x86/cleanups] " tip-bot2 for Xin Li (Intel)
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