Re: [linux-safety] [PATCH 2/4] x86/mce: move the mce_panic() call and kill_it assignments at the right places

From: "Paoloni, Gabriele" <gabriele.paoloni@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: "Luck, Tony" <tony.luck@intel.com>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-safety@lists.elisa.tech" <linux-safety@lists.elisa.tech>
Subject: Re: [linux-safety] [PATCH 2/4] x86/mce: move the mce_panic() call and kill_it assignments at the right places
Date: Mon, 23 Nov 2020 17:40:21 +0000	[thread overview]
Message-ID: <MN2PR11MB4158D04F8ABD74C313667CF088FC0@MN2PR11MB4158.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20201123171910.GF15044@zn.tnic>

> -----Original Message-----
> From: Borislav Petkov <bp@alien8.de>
> Sent: Monday, November 23, 2020 6:19 PM
> To: Paoloni, Gabriele <gabriele.paoloni@intel.com>
> Cc: Luck, Tony <tony.luck@intel.com>; tglx@linutronix.de;
> mingo@redhat.com; x86@kernel.org; hpa@zytor.com; linux-
> edac@vger.kernel.org; linux-kernel@vger.kernel.org; linux-
> safety@lists.elisa.tech
> Subject: Re: [PATCH 2/4] x86/mce: move the mce_panic() call and kill_it
> assignments at the right places
> 
> On Mon, Nov 23, 2020 at 05:06:31PM +0000, Paoloni, Gabriele wrote:
> > From my understanding no_way_out and kill_it are different in principles:
> > no_way_out is telling that an error occurred 'somewhere' in some CPU
> bank
> > that requires the system to panic (e.g. PCC=1); kill_it is saying that the
> execution
> > cannot be restarted where it left for the local CPU and hence we need to
> find
> > an alternative solution as part of the recovery action. In practice it seems to
> > me that kill_it is used to replace kill_me_maybe with kill_me_now in case
> > the exception happened in user mode.
> 
> Bah, I got confused, sorry about that - you're right.
Well it is not the easiest code to decode 😊

> 
> Btw, that kill_it should probably be called "kill_current_task" or so to
> make it more clear.
Sure I can add another patch to the set to rename it.

Gab

> 
> Thx.
> 
> --
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette
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