linux-kernel - RE: [PATCH v2 6/6] x86/mce: Dynamically register default MCE handler

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F7F5202EC@ORSMSX115.amr.corp.intel.com>
Date:   Thu, 9 Jan 2020 21:54:08 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Ghannam, Yazen" <Yazen.Ghannam@....com>,
        Borislav Petkov <bp@...en8.de>
CC:     Jan H. Schönherr <jschoenh@...zon.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>
Subject: RE: [PATCH v2 6/6] x86/mce: Dynamically register default MCE handler

> It seems to me that the issue is the mcelog notifier counts toward the number
> of notifiers, so the default notifier doesn't print anything.

If we gave a API to the notifiers to say whether to suppress printing, then the
dev_mcelog() code could do the suppression only if some process had
/dev/mcelog open. So if mcelog(8) wasn't running, you'd still see the console
message.

-Tony