linux-kernel - Re: [patch 4/6] x86/smp: Cure kexec() vs. mwait_play

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Date:   Mon, 05 Jun 2023 09:41:30 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ashok Raj <ashok.raj@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Ashok Raj <ashok.raj@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Arjan van de Veen <arjan@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Ashok Raj <ashok.raj@...el.com>
Subject: Re: [patch 4/6] x86/smp: Cure kexec() vs. mwait_play_dead() breakage

On Sat, Jun 03 2023 at 20:19, Ashok Raj wrote:
> On Sat, Jun 03, 2023 at 10:07:01PM +0200, Thomas Gleixner wrote:
>>  
>> +void smp_kick_mwait_play_dead(void);
>> +
>
> This seems like its missing prototype for #else for !CONFIG_SMP
>
>  #else /* !CONFIG_SMP */
> +#define smp_kick_mwait_play_dead(void) { }

Nope. The code which calls this is only compiled when SMP=y