linux-kernel - [PATCH] riscv: Register IPI IRQs with unique names

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Message-ID: <20251016003244.3910332-1-samuel.holland@sifive.com>
Date: Wed, 15 Oct 2025 17:32:05 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <pjw@...nel.org>
Cc: Samuel Holland <samuel.holland@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Valentina Fernandez <valentina.fernandezalanis@...rochip.com>,
	Yunhui Cui <cuiyunhui@...edance.com>,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH] riscv: Register IPI IRQs with unique names

This allows different IPIs to be distinguished in tracing output.

Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

 arch/riscv/kernel/smp.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index e650dec44817..5ed5095320e6 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -40,6 +40,17 @@ enum ipi_message_type {
 	IPI_MAX
 };
 
+static const char * const ipi_names[] = {
+	[IPI_RESCHEDULE]	= "Rescheduling interrupts",
+	[IPI_CALL_FUNC]		= "Function call interrupts",
+	[IPI_CPU_STOP]		= "CPU stop interrupts",
+	[IPI_CPU_CRASH_STOP]	= "CPU stop (for crash dump) interrupts",
+	[IPI_IRQ_WORK]		= "IRQ work interrupts",
+	[IPI_TIMER]		= "Timer broadcast interrupts",
+	[IPI_CPU_BACKTRACE]     = "CPU backtrace interrupts",
+	[IPI_KGDB_ROUNDUP]	= "KGDB roundup interrupts",
+};
+
 unsigned long __cpuid_to_hartid_map[NR_CPUS] __ro_after_init = {
 	[0 ... NR_CPUS-1] = INVALID_HARTID
 };
@@ -199,7 +210,7 @@ void riscv_ipi_set_virq_range(int virq, int nr)
 	/* Request IPIs */
 	for (i = 0; i < nr_ipi; i++) {
 		err = request_percpu_irq(ipi_virq_base + i, handle_IPI,
-					 "IPI", &ipi_dummy_dev);
+					 ipi_names[i], &ipi_dummy_dev);
 		WARN_ON(err);
 
 		ipi_desc[i] = irq_to_desc(ipi_virq_base + i);
@@ -210,17 +221,6 @@ void riscv_ipi_set_virq_range(int virq, int nr)
 	riscv_ipi_enable();
 }
 
-static const char * const ipi_names[] = {
-	[IPI_RESCHEDULE]	= "Rescheduling interrupts",
-	[IPI_CALL_FUNC]		= "Function call interrupts",
-	[IPI_CPU_STOP]		= "CPU stop interrupts",
-	[IPI_CPU_CRASH_STOP]	= "CPU stop (for crash dump) interrupts",
-	[IPI_IRQ_WORK]		= "IRQ work interrupts",
-	[IPI_TIMER]		= "Timer broadcast interrupts",
-	[IPI_CPU_BACKTRACE]     = "CPU backtrace interrupts",
-	[IPI_KGDB_ROUNDUP]	= "KGDB roundup interrupts",
-};
-
 void show_ipi_stats(struct seq_file *p, int prec)
 {
 	unsigned int cpu, i;
-- 
2.47.2

base-commit: 5a6f65d1502551f84c158789e5d89299c78907c7
branch: up/ipi-names