linux-kernel - [tip: x86/cleanups] x86/nmi: Remove an unnecessary IS_ENABLED(CONFIG

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Date: Tue, 27 Feb 2024 21:10:38 -0000
From: "tip-bot2 for Xin Li (Intel)" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "H. Peter Anvin (Intel)" <hpa@...or.com>, "Xin Li (Intel)" <xin@...or.com>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: x86/cleanups] x86/nmi: Remove an unnecessary IS_ENABLED(CONFIG_SMP)

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     47403a4b49767f1d533e4dc5f5cf5cc957f22a5e
Gitweb:        https://git.kernel.org/tip/47403a4b49767f1d533e4dc5f5cf5cc957f22a5e
Author:        Xin Li (Intel) <xin@...or.com>
AuthorDate:    Thu, 01 Feb 2024 01:46:04 -08:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 27 Feb 2024 22:00:50 +01:00

x86/nmi: Remove an unnecessary IS_ENABLED(CONFIG_SMP)

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@...or.com>
Signed-off-by: Xin Li (Intel) <xin@...or.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20240201094604.3918141-1-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 17e955a..44fe569 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -502,7 +502,7 @@ 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;