linux-kernel - [PATCH v11 2/7] LoongArch: Define ARCH_IRQ_INIT_FLAGS as IRQ

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Message-Id: <20240823103337.23602-3-zhangtianyang@loongson.cn>
Date: Fri, 23 Aug 2024 18:33:31 +0800
From: Tianyang Zhang <zhangtianyang@...ngson.cn>
To: corbet@....net,
	alexs@...nel.org,
	chenhuacai@...nel.org,
	kernel@...0n.name,
	tglx@...utronix.de,
	jiaxun.yang@...goat.com,
	gaoliang@...ngson.cn,
	wangliupu@...ngson.cn,
	lvjianmin@...ngson.cn,
	zhangtianyang@...ngson.cn,
	yijun@...ngson.cn,
	mhocko@...e.com,
	akpm@...ux-foundation.org,
	dianders@...omium.org,
	maobibo@...ngson.cn,
	xry111@...111.site,
	zhaotianrui@...ngson.cn,
	nathan@...nel.org,
	yangtiezhu@...ngson.cn,
	zhoubinbin@...ngson.cn
Cc: loongarch@...ts.linux.dev,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH v11 2/7] LoongArch: Define ARCH_IRQ_INIT_FLAGS as IRQ_NOPROBE

From: Huacai Chen <chenhuacai@...ngson.cn>

Currently we call irq_set_noprobe() in a loop for all IRQs, but indeed
it only works for IRQs below NR_IRQS_LEGACY because at init_IRQ() only
legacy interrupts have been allocated.

Instead, we can define ARCH_IRQ_INIT_FLAGS as IRQ_NOPROBE in asm/hwirq.h
and the core will automatically set the flag for all interrupts.

Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
---
 arch/loongarch/include/asm/hw_irq.h | 2 ++
 arch/loongarch/kernel/irq.c         | 3 ---
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/loongarch/include/asm/hw_irq.h b/arch/loongarch/include/asm/hw_irq.h
index af4f4e8fbd85..8156ffb67415 100644
--- a/arch/loongarch/include/asm/hw_irq.h
+++ b/arch/loongarch/include/asm/hw_irq.h
@@ -9,6 +9,8 @@
 
 extern atomic_t irq_err_count;
 
+#define ARCH_IRQ_INIT_FLAGS	IRQ_NOPROBE
+
 /*
  * interrupt-retrigger: NOP for now. This may not be appropriate for all
  * machines, we'll see ...
diff --git a/arch/loongarch/kernel/irq.c b/arch/loongarch/kernel/irq.c
index f4991c03514f..adac8fcbb2ac 100644
--- a/arch/loongarch/kernel/irq.c
+++ b/arch/loongarch/kernel/irq.c
@@ -102,9 +102,6 @@ void __init init_IRQ(void)
 	mp_ops.init_ipi();
 #endif
 
-	for (i = 0; i < NR_IRQS; i++)
-		irq_set_noprobe(i);
-
 	for_each_possible_cpu(i) {
 		page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order);
 
-- 
2.20.1