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From:   Anup Patel <anup@brainfault.org>
Date:   Mon, 9 Mar 2020 17:30:39 +0530
Message-ID: <CAAhSdy0t__RvDFkBkjEsaPma5j4_pOH9TvT4AFw3yuH2M6_PHA@mail.gmail.com>
Subject: Re: [PATCH v4 5/5] RISC-V: Remove do_IRQ() function
To:     Anup Patel <anup.patel@wdc.com>
Cc:     Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Atish Patra <atish.patra@wdc.com>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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Fixed Marc's email address.

On Mon, Mar 9, 2020 at 4:33 PM Anup Patel <anup.patel@wdc.com> wrote:
>
> 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@wdc.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
>