Commit 71261072 authored Mar 04, 2024 by Thomas Gleixner Committed by Ingo Molnar Mar 04, 2024

smp: Consolidate smp_prepare_boot_cpu()



There is no point in having seven architectures implementing the same empty
stub.

Provide a weak function in the init code and remove the stubs.

This also allows to utilize the function on UP which is required to
sanitize the per CPU handling on X86 UP.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240304005104.567671691@linutronix.de

parent 5323922f

arch/alpha/kernel/smp.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -467,11 +467,6 @@ smp_prepare_cpus(unsigned int max_cpus)
		smp_num_cpus = smp_num_probed;
		}

		void
		smp_prepare_boot_cpu(void)
		{
		}

		int
		__cpu_up(unsigned int cpu, struct task_struct *tidle)
		{

arch/arc/kernel/smp.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -39,11 +39,6 @@ struct plat_smp_ops __weak plat_smp_ops;
		/* XXX: per cpu ? Only needed once in early secondary boot */
		struct task_struct *secondary_idle_tsk;

		/* Called from start_kernel */
		void __init smp_prepare_boot_cpu(void)
		{
		}

		static int __init arc_get_cpu_map(const char name, struct cpumask cpumask)
		{
		unsigned long dt_root = of_get_flat_dt_root();

arch/csky/kernel/smp.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -152,10 +152,6 @@ void arch_irq_work_raise(void)
		}
		#endif

		void __init smp_prepare_boot_cpu(void)
		{
		}

		void __init smp_prepare_cpus(unsigned int max_cpus)
		{
		}

arch/hexagon/kernel/smp.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -114,10 +114,6 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
		local_irq_restore(flags);
		}

		void __init smp_prepare_boot_cpu(void)
		{
		}

		/*
		* interrupts should already be disabled from the VM
		* SP should already be correct; need to set THREADINFO_REG

arch/openrisc/kernel/smp.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -57,10 +57,6 @@ static void boot_secondary(unsigned int cpu, struct task_struct *idle)
		spin_unlock(&boot_lock);
		}

		void __init smp_prepare_boot_cpu(void)
		{
		}

		void __init smp_init_cpus(void)
		{
		struct device_node *cpu;