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

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Message-ID: <CAJF2gTS7pWBBaYmNNuzGUT4DBkQtWVvyzFBrR02CMms1yCQHvg@mail.gmail.com>
Date:   Fri, 22 Oct 2021 10:26:48 +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 10:19 AM Guo Ren <guoren@...nel.org> wrote:
>
> 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();

Sorry, handle_domain_irq has done it, and C-SKY's IPI is in the
handle_domain_irq.

Reviewed-by: Guo Ren <guoren@...nel.org>

>
> > --
> > 2.11.0
> >
>
>
> --
> Best Regards
>  Guo Ren
>
> ML: https://lore.kernel.org/linux-csky/



-- 
Best Regards
 Guo Ren

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