linux-kernel - [PATCH 2/2] LoongArch: KVM:: simplify kvm_deliver

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Message-ID: <20250716165929.22386-3-yury.norov@gmail.com>
Date: Wed, 16 Jul 2025 12:59:27 -0400
From: Yury Norov <yury.norov@...il.com>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Bibo Mao <maobibo@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>
Subject: [PATCH 2/2] LoongArch: KVM:: simplify kvm_deliver_intr()

From: "Yury Norov (NVIDIA)" <yury.norov@...il.com>

The function opencodes for_each_set_bit() macro, which makes it bulky.
Using the proper API makes all the housekeeping code going away.

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>
---
 arch/loongarch/kvm/interrupt.c | 25 ++++---------------------
 1 file changed, 4 insertions(+), 21 deletions(-)

diff --git a/arch/loongarch/kvm/interrupt.c b/arch/loongarch/kvm/interrupt.c
index 4c3f22de4b40..8462083f0301 100644
--- a/arch/loongarch/kvm/interrupt.c
+++ b/arch/loongarch/kvm/interrupt.c
@@ -83,28 +83,11 @@ void kvm_deliver_intr(struct kvm_vcpu *vcpu)
 	unsigned long *pending = &vcpu->arch.irq_pending;
 	unsigned long *pending_clr = &vcpu->arch.irq_clear;
 
-	if (!(*pending) && !(*pending_clr))
-		return;
-
-	if (*pending_clr) {
-		priority = __ffs(*pending_clr);
-		while (priority <= INT_IPI) {
-			kvm_irq_clear(vcpu, priority);
-			priority = find_next_bit(pending_clr,
-					BITS_PER_BYTE * sizeof(*pending_clr),
-					priority + 1);
-		}
-	}
+	for_each_set_bit(priority, pending_clr, INT_IPI + 1)
+		kvm_irq_clear(vcpu, priority);
 
-	if (*pending) {
-		priority = __ffs(*pending);
-		while (priority <= INT_IPI) {
-			kvm_irq_deliver(vcpu, priority);
-			priority = find_next_bit(pending,
-					BITS_PER_BYTE * sizeof(*pending),
-					priority + 1);
-		}
-	}
+	for_each_set_bit(priority, pending, INT_IPI + 1)
+		kvm_irq_deliver(vcpu, priority);
 }
 
 int kvm_pending_timer(struct kvm_vcpu *vcpu)
-- 
2.43.0