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[v4,04/10] MIPS: Move mips_smp_ipi_init call after prepare_cpus

Message ID 20240907-b4-mips-ipi-improvements-v4-4-ac288f9aff0b@flygoat.com (mailing list archive)
State Superseded
Headers show
Series MIPS: IPI Improvements | expand

Commit Message

Jiaxun Yang Sept. 7, 2024, 11:48 a.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.

Tested-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 arch/mips/kernel/smp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index d3c7486fee3d..81ae65f21f73 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