linux-kernel - Re: [PATCH] x86/hotplug: Remove incorrect comment about mwait_play

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Date:   Tue, 14 Feb 2023 09:09:58 -0800
From:   "Srivatsa S. Bhat" <srivatsa@...il.mit.edu>
To:     tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        peterz@...radead.org, hpa@...or.com
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com,
        rafael.j.wysocki@...el.com, paulmck@...nel.org, jgross@...e.com,
        seanjc@...gle.com, thomas.lendacky@....com,
        linux-kernel@...r.kernel.org, imammedo@...hat.com,
        amakhalov@...are.com, ganb@...are.com, ankitja@...are.com,
        bordoloih@...are.com, keerthanak@...are.com, blamoreaux@...are.com,
        namit@...are.com, wyes.karny@....com, lewis.carroll@....com,
        pv-drivers@...are.com, virtualization@...ts.linux-foundation.org,
        kvm@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH] x86/hotplug: Remove incorrect comment about
 mwait_play_dead()


Hi,

On 1/27/23 4:37 PM, Srivatsa S. Bhat wrote:
> From: "Srivatsa S. Bhat (VMware)" <srivatsa@...il.mit.edu>
> 
> The comment that says mwait_play_dead() returns only on failure is a
> bit misleading because mwait_play_dead() could actually return for
> valid reasons (such as mwait not being supported by the platform) that
> do not indicate a failure of the CPU offline operation. So, remove the
> comment.
> 
> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Srivatsa S. Bhat (VMware) <srivatsa@...il.mit.edu>


Gentle ping for review. Thank you!

Regards,
Srivatsa

> ---
>  arch/x86/kernel/smpboot.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 55cad72715d9..9013bb28255a 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -1833,7 +1833,7 @@ void native_play_dead(void)
>  	play_dead_common();
>  	tboot_shutdown(TB_SHUTDOWN_WFS);
>  
> -	mwait_play_dead();	/* Only returns on failure */
> +	mwait_play_dead();
>  	if (cpuidle_play_dead())
>  		hlt_play_dead();
>  }
>