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From:   Guo Ren <guoren@kernel.org>
Date:   Wed, 16 Oct 2019 07:29:34 +0800
Message-ID: <CAJF2gTSVxgc5kw22dfotoHF91HxyTKC4ETYLTskEfyn3rf=kCw@mail.gmail.com>
Subject: Re: [PATCH 06/34] csky: Use CONFIG_PREEMPTION
To:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        tglx@linutronix.de
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Could CONFIG_PREEMPT_RT be supported in csky ? Any arch backend porting ?

On Wed, Oct 16, 2019 at 3:18 AM Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:
>
> From: Thomas Gleixner <tglx@linutronix.de>
>
> CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT.
> Both PREEMPT and PREEMPT_RT require the same functionality which today
> depends on CONFIG_PREEMPT.
>
> Switch the entry code over to use CONFIG_PREEMPTION.
>
> Cc: Guo Ren <guoren@kernel.org>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> ---
>  arch/csky/kernel/entry.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
> index a7a5b67df8989..0077063280000 100644
> --- a/arch/csky/kernel/entry.S
> +++ b/arch/csky/kernel/entry.S
> @@ -277,7 +277,7 @@ ENTRY(csky_irq)
>         zero_fp
>         psrset  ee
>
> -#ifdef CONFIG_PREEMPT
> +#ifdef CONFIG_PREEMPTION
>         mov     r9, sp                  /* Get current stack  pointer */
>         bmaski  r10, THREAD_SHIFT
>         andn    r9, r10                 /* Get thread_info */
> @@ -294,7 +294,7 @@ ENTRY(csky_irq)
>         mov     a0, sp
>         jbsr    csky_do_IRQ
>
> -#ifdef CONFIG_PREEMPT
> +#ifdef CONFIG_PREEMPTION
>         subi    r12, 1
>         stw     r12, (r9, TINFO_PREEMPT)
>         cmpnei  r12, 0
> --
> 2.23.0
>


-- 
Best Regards
 Guo Ren

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