linux-kernel - Re: [PATCH V2] sched/rt, powerpc: Prepare for PREEMPT

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Date:   Tue, 10 Nov 2020 09:06:21 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Wang Qing <wangqing@...o.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Jordan Niethe <jniethe5@...il.com>,
        Alistair Popple <alistair@...ple.id.au>,
        Michael Neuling <mikey@...ling.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de
Subject: Re: [PATCH V2] sched/rt, powerpc: Prepare for PREEMPT_RT



Le 10/11/2020 à 09:02, Wang Qing a écrit :
> PREEMPT_RT is a separate preemption model, CONFIG_PRTTMPT will

s/CONFIG_PRTTMPT/CONFIG_PREEMPT

>   be disabled when CONFIG_PREEMPT_RT is enabled,  so you need
> to add CONFIG_PREEMPT_RT judgments to __die().
> 
> Signed-off-by: Wang Qing <wangqing@...o.com>

Otherwise

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> 
> Changes in v2:
>   - Modify as Christophe suggested.
> ---
>   arch/powerpc/kernel/traps.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index 5006dcb..dec7b81
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -262,10 +262,11 @@ static int __die(const char *str, struct pt_regs *regs, long err)
>   {
>   	printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
>   
> -	printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s %s\n",
> +	printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s%s %s\n",
>   	       IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN) ? "LE" : "BE",
>   	       PAGE_SIZE / 1024, get_mmu_str(),
>   	       IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
> +	       IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : "",
>   	       IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
>   	       IS_ENABLED(CONFIG_SMP) ? (" NR_CPUS=" __stringify(NR_CPUS)) : "",
>   	       debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "",
>