linux-kernel - Re: [RFC PATCH] x86, mce: change the mce notifier to 'blocking' from 'atomic'

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Date:   Wed, 12 Apr 2017 15:26:19 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Dan Williams <dan.j.williams@...el.com>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>,
        "ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [RFC PATCH] x86, mce: change the mce notifier to 'blocking' from
 'atomic'

On Thu, Apr 13, 2017 at 12:16:39AM +0200, Borislav Petkov wrote:
> ... and it is midnight here so I could be talking crap but we probably
> should really split the reporting "chain" into two:

This shouldn't be too painful. Users ask to be put on the chain via
the wrapper:

void mce_register_decode_chain(struct notifier_block *nb)
{
        atomic_inc(&num_notifiers);

        WARN_ON(nb->priority > MCE_PRIO_LOWEST && nb->priority < MCE_PRIO_EDAC);

        atomic_notifier_chain_register(&x86_mce_decoder_chain, nb);
}

We can futz with that and have them specify which chain (or both)
that they want to be added to.

-Tony