[PATCH v4 5/5] RISC-V: Remove do_IRQ() function

From: Anup Patel
Date: Mon Mar 09 2020 - 07:03:23 EST


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@xxxxxxx>
---
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