linux-kernel - RE: [PATCH v5] panic: add panic_force_cpu= parameter to redirect panic to a specific CPU

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Message-ID:
 <MRWPR09MB80221AFF22DF7987E1BE62EE8F80A@MRWPR09MB8022.eurprd09.prod.outlook.com>
Date: Sun, 11 Jan 2026 10:05:05 +0000
From: Pnina Feder <PNINA.FEDER@...ileye.com>
To: Steven Rostedt <rostedt@...dmis.org>
CC: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"pmladek@...e.com" <pmladek@...e.com>, "bhe@...hat.com" <bhe@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lkp@...el.com" <lkp@...el.com>, "mgorman@...e.de" <mgorman@...e.de>,
	"mingo@...hat.com" <mingo@...hat.com>, "peterz@...radead.org"
	<peterz@...radead.org>, "senozhatsky@...omium.org"
	<senozhatsky@...omium.org>, "tglx@...utronix.de" <tglx@...utronix.de>,
	Vladimir Kondratiev <Vladimir.Kondratiev@...ileye.com>
Subject: RE: [PATCH v5] panic: add panic_force_cpu= parameter to redirect
 panic to a specific CPU

Hi Steve,

Thanks for the guidance, will do.

Pnina

> On Thu,  8 Jan 2026 22:36:12 +0200
> Pnina Feder <pnina.feder@...ileye.com> wrote:
> 
> First, new versions of a patch or patch set should *always* be a new thread and not a reply to the old version. That makes it much harder on maintainers to see a new series.
> 
> > If the specified CPU is invalid, offline, or a panic is already in 
> > progress on another CPU, the redirection is skipped and panic 
> > continues on the current CPU.
> > 
> > Changes since v4:
> >  - Make IPI delivery an overridable weak function (panic_smp_redirect_cpu)
> >    so architectures can use NMI where available
> >  - Add declaration on include/linux/smp.h alongside other panic SMP 
> > functions
> >  - Add warning to documentation about reduced reliability
> >  - Address review comments from Andrew Morton (remove unnecessary cast,
> >    add missing kernel-doc parameters)
> > 
> > Signed-off-by: Pnina Feder <pnina.feder@...ileye.com>
> > ---
> 
> The "Changes since" line should always be below the '---' otherwise it gets pulled into the git log and the maintainer needs to manually delete it (which is annoying).
> 
> Also, it is helpful to add a link to the previous version.
> 
> > Signed-off-by: Pnina Feder <pnina.feder@...ileye.com>
> > ---
>  Changes since v4: Suspicious Link - Removed
>   - Make IPI delivery an overridable weak function (panic_smp_redirect_cpu)
>     so architectures can use NMI where available
>   - Add declaration on include/linux/smp.h alongside other panic SMP functions
>   - Add warning to documentation about reduced reliability
>   - Address review comments from Andrew Morton (remove unnecessary cast,
>     add missing kernel-doc parameters)
> 
> This provides the continuity between versions without having to be replies of older versions.
> 
> -- Steve