linux-kernel - Re: [PATCH v4 0/2] kexec, panic: Making crash

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Date:   Wed, 13 Jul 2022 10:39:33 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Valentin Schneider <vschneid@...hat.com>
Cc:     Baoquan He <bhe@...hat.com>, kexec@...ts.infradead.org,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Biederman <ebiederm@...ssion.com>,
        Arnd Bergmann <arnd@...db.de>, Petr Mladek <pmladek@...e.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Juri Lelli <jlelli@...hat.com>,
        "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
Subject: Re: [PATCH v4 0/2] kexec, panic: Making crash_kexec() NMI safe

On Tue, 12 Jul 2022 12:13:03 +0100 Valentin Schneider <vschneid@...hat.com> wrote:

> On 12/07/22 10:47, Baoquan He wrote:
> > Hi,
> >
> > On 06/30/22 at 11:32pm, Valentin Schneider wrote:
> >> Hi folks,
> >>
> >> Here's ~v3~ v4 where we now completely get rid of kexec_mutex.
> >>
> >> o Patch 1 makes sure all kexec_mutex acquisitions are trylocks. This prevents
> >>   having to add any while(atomic_cmpxchg()) loops which I'd really hate to see
> >>   here. If that can't be done then I think we're better off with the combined
> >>   mutex+atomic var approach.
> >> o Patch 2 does the mutex -> atomic var switch.
> >
> > This series looks good, has it been taken into any tree?
> >
> 
> I don't think so, briefly poked around git and haven't seen it anywhere.

I'll stash it away for consideration after -rc1.