linux-kernel - Re: [RFC PATCH 12/23] kernel/watchdog: Introduce a struct for NMI watchdog operations

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Date:   Wed, 13 Jun 2018 17:41:41 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andi Kleen <andi.kleen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>, x86@...nel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Jacob Pan <jacob.jun.pan@...el.com>,
        Don Zickus <dzickus@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frederic Weisbecker <frederic@...nel.org>,
        Babu Moger <babu.moger@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Colin Ian King <colin.king@...onical.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        iommu@...ts.linux-foundation.org
Subject: Re: [RFC PATCH 12/23] kernel/watchdog: Introduce a struct for NMI
 watchdog operations

On Tue, 12 Jun 2018 17:57:32 -0700
Ricardo Neri <ricardo.neri-calderon@...ux.intel.com> wrote:

> Instead of exposing individual functions for the operations of the NMI
> watchdog, define a common interface that can be used across multiple
> implementations.
> 
> The struct nmi_watchdog_ops is defined for such operations. These initial
> definitions include the enable, disable, start, stop, and cleanup
> operations.
> 
> Only a single NMI watchdog can be used in the system. The operations of
> this NMI watchdog are accessed via the new variable nmi_wd_ops. This
> variable is set to point the operations of the first NMI watchdog that
> initializes successfully. Even though at this moment, the only available
> NMI watchdog is the perf-based hardlockup detector. More implementations
> can be added in the future.

Cool, this looks pretty nice at a quick glance. sparc and powerpc at
least have their own NMI watchdogs, it would be good to have those
converted as well.

Is hpet a cross platform thing, or just x86? We should avoid
proliferation of files under kernel/ I think, so with these watchdog
driver structs then maybe implementations could go in drivers/ or
arch/

Thanks,
Nick