linux-kernel - Re: [PATCH v3] cxl/events: Use a common struct for DRAM and General Media events

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Message-ID: <664bd935b9eb4_a02829444@dwillia2-mobl3.amr.corp.intel.com.notmuch>
Date: Mon, 20 May 2024 16:13:57 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: "Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>, "Dan
 Williams" <dan.j.williams@...el.com>, <linux-cxl@...r.kernel.org>
CC: Ira Weiny <ira.weiny@...el.com>, Davidlohr Bueso <dave@...olabs.net>,
	Jonathan Cameron <jonathan.cameron@...wei.com>, Dave Jiang
	<dave.jiang@...el.com>, Alison Schofield <alison.schofield@...el.com>, Vishal
 Verma <vishal.l.verma@...el.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] cxl/events: Use a common struct for DRAM and General
 Media events

Fabio M. De Francesco wrote:
> On Monday, May 20, 2024 7:55:17 PM GMT+2 Fabio M. De Francesco wrote:
> > On Saturday, May 18, 2024 1:26:21 PM GMT+2 Fabio M. De Francesco wrote:
> > [...]
> I suspect that I didn't clarify that the diff above is proposing an additional 
> little change to this patch (for v4) and that I wanted to collect comments 
> before applying and respinning.
> 
> To be clearer, that diff is meant only to show that cxl_event_media_hdr can be 
> removed from union cxl_event at no cost while still be used for the common 
> fields in the definitions of cxl_event_dram and cxl_event_gen_media.

I agree with Alison, this is what a union is for, and more generally,
runtime code should never be added to make up for deficiencies in the data
structure.