linux-kernel - [PATCH v4 5/5] RISC-V: Remove do

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Message-Id: <20200309110211.91130-6-anup.patel@wdc.com>
Date:   Mon,  9 Mar 2020 16:32:11 +0530
From:   Anup Patel <anup.patel@....com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>
Cc:     Atish Patra <atish.patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anup Patel <anup.patel@....com>
Subject: [PATCH v4 5/5] RISC-V: Remove do_IRQ() function

The only thing do_IRQ() does is call handle_arch_irq function
pointer. We can very well call handle_arch_irq function pointer
directly from assembly and remove do_IRQ() function hence this
patch.

Signed-off-by: Anup Patel <anup.patel@....com>
---
 arch/riscv/kernel/entry.S | 4 +++-
 arch/riscv/kernel/irq.c   | 6 ------
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 208702d8c18e..238f0ca070db 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -183,7 +183,9 @@ ENTRY(handle_exception)
 
 	/* Handle interrupts */
 	move a0, sp /* pt_regs */
-	tail do_IRQ
+	la a1, handle_arch_irq
+	REG_L a1, (a1)
+	jr a1
 1:
 	/*
 	 * Exceptions run with interrupts enabled or disabled depending on the
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index eb8777642ce6..7207fa08d78f 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -16,12 +16,6 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 	return 0;
 }
 
-asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
-{
-	if (handle_arch_irq)
-		handle_arch_irq(regs);
-}
-
 void __init init_IRQ(void)
 {
 	irqchip_init();
-- 
2.17.1