linux-kernel - RE: [PATCH RFC v2 3/3] cxl/memdev: Register for and process CPER events

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Message-ID: <653aee8ad2717_780ef29418@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Thu, 26 Oct 2023 15:56:10 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
CC:     Yazen Ghannam <yazen.ghannam@....com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Ard Biesheuvel" <ardb@...nel.org>, <linux-efi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
        Ira Weiny <ira.weiny@...el.com>
Subject: RE: [PATCH RFC v2 3/3] cxl/memdev: Register for and process CPER
 events

Ira Weiny wrote:
> If the firmware has configured CXL event support to be firmware first
> the OS can process those events through CPER records.  Matching memory
> devices to the CPER records can be done via the serial number which is
> part of the CPER record header.
> 
> Detect firmware first, register a notifier callback for each memdev, and
> trace events when they match a device registered.
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
[..]

The changes requested in patch2 cover all of the comments I currently
have on this patch, just one more cleanup below:

> +#define CXL_EVENT_HDR_FLAGS_REC_SEVERITY GENMASK(1, 0)
> +int cxl_cper_event_call(struct notifier_block *nb, unsigned long action, void *data)
> +{
> +	struct cxl_cper_notifier_data *nd = data;
> +	struct cxl_event_record_raw record = (struct cxl_event_record_raw) {
> +		.hdr.id = UUID_INIT(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
> +	};

Just do:

	struct cxl_event_record_raw record = { 0 };

...and the compiler will take care of the rest as initializing any field
automatically initializes everything else to zero.