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[v2,04/10] MIPS: Move mips_smp_ipi_init call after prepare_cpus

Message ID 20240705-b4-mips-ipi-improvements-v2-4-2d50b56268e8@flygoat.com (mailing list archive)
State New
Headers show
Series MIPS: IPI Improvements | expand

Commit Message

Jiaxun Yang July 5, 2024, 2:16 p.m. UTC 
This will give platform code a genuine chance to setup
IPI IRQ in prepare_cpus.

For most systems IPI should be registered by irqchip drivers
fairly early, but if IPI IRQ is tightly coupled with platform's
SMP implementation it makes sense to do it here.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 arch/mips/kernel/smp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index fe053fe52147..f29259d16a37 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -375,7 +375,6 @@  static int __init mips_smp_ipi_init(void)
 
 	return 0;
 }
-early_initcall(mips_smp_ipi_init);
 #endif
 
 /*
@@ -466,6 +465,13 @@  void __init smp_prepare_cpus(unsigned int max_cpus)
 	set_cpu_sibling_map(0);
 	set_cpu_core_map(0);
 	calculate_cpu_foreign_map();
+#ifdef CONFIG_GENERIC_IRQ_IPI
+	if (mips_smp_ipi_init()) {
+		pr_err("Failed to initialize IPI - disabling SMP");
+		init_cpu_present(cpumask_of(0));
+		return;
+	}
+#endif
 #ifndef CONFIG_HOTPLUG_CPU
 	init_cpu_present(cpu_possible_mask);
 #endif