linux-kernel - Re: [PATCH 11/15] irq: csky: perform irqentry in entry code

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Date:   Fri, 22 Oct 2021 10:19:53 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Vincent Chen <deanbo422@...il.com>,
        Greentime Hu <green.hu@...il.com>,
        Jonas Bonn <jonas@...thpole.se>, kernelfans@...il.com,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Russell King <linux@...linux.org.uk>,
        Marc Zyngier <maz@...nel.org>, Nick Hu <nickhu@...estech.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul McKenney <paulmck@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Stafford Horne <shorne@...il.com>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        vgupta@...nel.org, Will Deacon <will@...nel.org>
Subject: Re: [PATCH 11/15] irq: csky: perform irqentry in entry code

On Fri, Oct 22, 2021 at 2:03 AM Mark Rutland <mark.rutland@....com> wrote:
>
> In preparation for removing HANDLE_DOMAIN_IRQ_IRQENTRY, have arch/csky
> perform all the irqentry accounting in its entry code. As arch/csky uses
> GENERIC_IRQ_MULTI_HANDLER, we can use generic_handle_arch_irq() to do
> so.
>
> There should be no functional change as a result of this patch.
>
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Cc: Guo Ren <guoren@...nel.org>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> ---
>  arch/csky/Kconfig        | 1 -
>  arch/csky/kernel/entry.S | 2 +-
>  arch/csky/kernel/irq.c   | 5 -----
>  3 files changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
> index 45f03f674a61..9d4d898df76b 100644
> --- a/arch/csky/Kconfig
> +++ b/arch/csky/Kconfig
> @@ -18,7 +18,6 @@ config CSKY
>         select DMA_DIRECT_REMAP
>         select IRQ_DOMAIN
>         select HANDLE_DOMAIN_IRQ
> -       select HANDLE_DOMAIN_IRQ_IRQENTRY
>         select DW_APB_TIMER_OF
>         select GENERIC_IOREMAP
>         select GENERIC_LIB_ASHLDI3
> diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
> index 00e3c8ebf9b8..a4ababf25e24 100644
> --- a/arch/csky/kernel/entry.S
> +++ b/arch/csky/kernel/entry.S
> @@ -249,7 +249,7 @@ ENTRY(csky_irq)
>
>
>         mov     a0, sp
> -       jbsr    csky_do_IRQ
> +       jbsr    generic_handle_arch_irq
>
>         jmpi    ret_from_exception
>
> diff --git a/arch/csky/kernel/irq.c b/arch/csky/kernel/irq.c
> index 03a1930f1cbb..fcdaf3156286 100644
> --- a/arch/csky/kernel/irq.c
> +++ b/arch/csky/kernel/irq.c
> @@ -15,8 +15,3 @@ void __init init_IRQ(void)
>         setup_smp_ipi();
>  #endif
>  }
> -
> -asmlinkage void __irq_entry csky_do_IRQ(struct pt_regs *regs)
> -{
> -       handle_arch_irq(regs);
> -}

Seems the previous code has lost old_regs save/restore?

+       struct pt_regs *old_regs;
+
+       irq_enter();
+       old_regs = set_irq_regs(regs);
+       handle_arch_irq(regs);
+       set_irq_regs(old_regs);
+       irq_exit();

> --
> 2.11.0
>


-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/