linux-kernel - [PATCH 1/3] MIPS: loongson64: Drop call to irq_cpu

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Date:   Thu, 21 Oct 2021 18:04:12 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Serge Semin <fancer.lancer@...il.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>, f.fainelli@...il.com,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 1/3] MIPS: loongson64: Drop call to irq_cpu_offline()

Also loongson64 calls irq_cpu_offline(), none of its interrupt
controllers implement the .irq_cpu_offline callback.

It is thus obvious that this call only serves the dubious purpose
of wasting precious CPU cycles by iterating over all interrupts.

Get rid of the call altogether.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 arch/mips/loongson64/smp.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/mips/loongson64/smp.c b/arch/mips/loongson64/smp.c
index 09ebe84a17fe..660e1de4412a 100644
--- a/arch/mips/loongson64/smp.c
+++ b/arch/mips/loongson64/smp.c
@@ -550,7 +550,6 @@ static int loongson3_cpu_disable(void)
 	set_cpu_online(cpu, false);
 	calculate_cpu_foreign_map();
 	local_irq_save(flags);
-	irq_cpu_offline();
 	clear_c0_status(ST0_IM);
 	local_irq_restore(flags);
 	local_flush_tlb_all();
-- 
2.30.2