linux-kernel - [PATCH 1/1] MIPS: Replace setup_irq() by request

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Date:   Tue,  7 Jun 2022 16:11:06 +0800
From:   Yupeng Li <liyupeng@...los.com>
To:     chenhc@...ote.com, ralf@...ux-mips.org, paul.burton@...s.com,
        jhogan@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        caizp2008@....com, Yupeng Li <liyupeng@...los.com>
Subject: [PATCH 1/1] MIPS: Replace setup_irq() by request_irq()

commit ac8fd122e070 ("MIPS: Replace setup_irq() by request_irq()")

request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

remove_irq() has been replaced by free_irq() as well.

There were build error's during previous version, couple of which was
reported by kbuild test robot <lkp@...el.com> of which one was reported
by Thomas Bogendoerfer <tsbogend@...ha.franken.de> as well. There were a
few more issues including build errors, those also have been fixed.

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: Yupeng Li <liyupeng@...los.com>
---
 arch/mips/loongson64/loongson-3/hpet.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/mips/loongson64/loongson-3/hpet.c b/arch/mips/loongson64/loongson-3/hpet.c
index ed15430ad64f..e4282592575b 100644
--- a/arch/mips/loongson64/loongson-3/hpet.c
+++ b/arch/mips/loongson64/loongson-3/hpet.c
@@ -187,12 +187,6 @@ static irqreturn_t hpet_irq_handler(int irq, void *data)
 	return IRQ_NONE;
 }
 
-static struct irqaction hpet_irq = {
-	.handler = hpet_irq_handler,
-	.flags = IRQF_NOBALANCING | IRQF_TIMER,
-	.name = "hpet",
-};
-
 /*
  * hpet address assignation and irq setting should be done in bios.
  * but pmon don't do this, we just setup here directly.
@@ -224,6 +218,7 @@ static void hpet_setup(void)
 
 void __init setup_hpet_timer(void)
 {
+	unsigned long flags = IRQF_NOBALANCING | IRQF_TIMER;
 	unsigned int cpu = smp_processor_id();
 	struct clock_event_device *cd;
 
@@ -247,7 +242,8 @@ void __init setup_hpet_timer(void)
 	cd->min_delta_ticks = HPET_MIN_PROG_DELTA;
 
 	clockevents_register_device(cd);
-	setup_irq(HPET_T0_IRQ, &hpet_irq);
+	if (request_irq(HPET_T0_IRQ, hpet_irq_handler, flags, "hpet", NULL))
+		pr_err("Failed to request irq %d (hpet)\n", HPET_T0_IRQ);
 	pr_info("hpet clock event device register\n");
 }
 
-- 
2.34.1