linux-kernel - Re: [patch V2 01/25] x86/kgbd: Use NMI_VECTOR not APIC_DM

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Date:   Fri, 5 Jul 2019 23:43:44 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
cc:     x86@...nel.org, Nadav Amit <namit@...are.com>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Feng Tang <feng.tang@...el.com>
Subject: Re: [patch V2 01/25] x86/kgbd: Use NMI_VECTOR not APIC_DM_NMI

On Thu, 4 Jul 2019, Thomas Gleixner wrote:

> apic->send_IPI_allbutself() takes a vector number as argument.
> 
> APIC_DM_NMI is clearly not a vector number. It's defined to 0x400 which is
> outside the vector space.
> 
> Use NMI_VECTOR instead as that's what it is intended to be.
> 
> Fixes: 82da3ff89dc2 ("x86: kgdb support")
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> V2: New patch
> ---
>  arch/x86/kernel/kgdb.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/arch/x86/kernel/kgdb.c
> +++ b/arch/x86/kernel/kgdb.c
> @@ -424,7 +424,7 @@ static void kgdb_disable_hw_debug(struct
>   */
>  void kgdb_roundup_cpus(void)
>  {
> -	apic->send_IPI_allbutself(APIC_DM_NMI);
> +	apic->send_IPI_allbutself(VECTOR_NMI);

The changelog got it right, but this here needs to be VECTOR_NMI. While I
didn't 0-day was able to find and turn on the config option ...

/blush