From 4c8a49854130da0117a0fdb858551824919a2389 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Tue, 27 Feb 2024 09:58:15 +0100
Subject: [PATCH] smp: Avoid 'setup_max_cpus' namespace collision/shadowing

bringup_nonboot_cpus() gets passed the 'setup_max_cpus'
variable in init/main.c - which is also the name of the parameter,
shadowing the name.

To reduce confusion and to allow the 'setup_max_cpus' value
to be #defined in the <linux/smp.h> header, use the 'max_cpus'
name for the function parameter name.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
---
 include/linux/cpu.h | 2 +-
 kernel/cpu.c        | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -112,7 +112,7 @@ void notify_cpu_starting(unsigned int cp
 extern void cpu_maps_update_begin(void);
 extern void cpu_maps_update_done(void);
 int bringup_hibernate_cpu(unsigned int sleep_cpu);
-void bringup_nonboot_cpus(unsigned int setup_max_cpus);
+void bringup_nonboot_cpus(unsigned int max_cpus);
 
 #else	/* CONFIG_SMP */
 #define cpuhp_tasks_frozen	0
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1905,17 +1905,17 @@ static bool __init cpuhp_bringup_cpus_pa
 static inline bool cpuhp_bringup_cpus_parallel(unsigned int ncpus) { return false; }
 #endif /* CONFIG_HOTPLUG_PARALLEL */
 
-void __init bringup_nonboot_cpus(unsigned int setup_max_cpus)
+void __init bringup_nonboot_cpus(unsigned int max_cpus)
 {
-	if (!setup_max_cpus)
+	if (!max_cpus)
 		return;
 
 	/* Try parallel bringup optimization if enabled */
-	if (cpuhp_bringup_cpus_parallel(setup_max_cpus))
+	if (cpuhp_bringup_cpus_parallel(max_cpus))
 		return;
 
 	/* Full per CPU serialized bringup */
-	cpuhp_bringup_mask(cpu_present_mask, setup_max_cpus, CPUHP_ONLINE);
+	cpuhp_bringup_mask(cpu_present_mask, max_cpus, CPUHP_ONLINE);
 }
 
 #ifdef CONFIG_PM_SLEEP_SMP
