linux-kernel - [tip: x86/core] x86/idle: Clean up idle selection

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Date: Mon, 04 Mar 2024 16:51:15 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/idle: Clean up idle selection

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

Commit-ID:     0ab562875c01c91ec8167f8f6593ea61e510fd0a
Gitweb:        https://git.kernel.org/tip/0ab562875c01c91ec8167f8f6593ea61e510fd0a
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Thu, 29 Feb 2024 15:23:38 +01:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 04 Mar 2024 17:39:24 +01:00

x86/idle: Clean up idle selection

Clean up the code to make it readable. No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/20240229142248.392017685@linutronix.de
---
 arch/x86/kernel/process.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index b86ff0f..792394b 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -910,11 +910,13 @@ static __cpuidle void mwait_idle(void)
 
 void select_idle_routine(const struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_SMP
-	if (boot_option_idle_override == IDLE_POLL && smp_num_siblings > 1)
-		pr_warn_once("WARNING: polling idle and HT enabled, performance may degrade\n");
-#endif
-	if (x86_idle_set() || boot_option_idle_override == IDLE_POLL)
+	if (boot_option_idle_override == IDLE_POLL) {
+		if (IS_ENABLED(CONFIG_SMP) && smp_num_siblings > 1)
+			pr_warn_once("WARNING: polling idle and HT enabled, performance may degrade\n");
+		return;
+	}
+
+	if (x86_idle_set())
 		return;
 
 	if (prefer_mwait_c1_over_halt(c)) {