linux-kernel - Re: [PATCH 06/26] cxl/port: Add Dynamic Capacity mode support to endpoint decoders

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Message-ID: <663903b35b66e_2e2d22945a@dwillia2-mobl3.amr.corp.intel.com.notmuch>
Date: Mon, 6 May 2024 09:22:11 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Ira Weiny <ira.weiny@...el.com>, Jonathan Cameron
	<Jonathan.Cameron@...wei.com>
CC: Dave Jiang <dave.jiang@...el.com>, Fan Ni <fan.ni@...sung.com>, "Navneet
 Singh" <navneet.singh@...el.com>, Dan Williams <dan.j.williams@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>, Alison Schofield
	<alison.schofield@...el.com>, Vishal Verma <vishal.l.verma@...el.com>,
	<linux-btrfs@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/26] cxl/port: Add Dynamic Capacity mode support to
 endpoint decoders

Ira Weiny wrote:
[..]
> > > +	case CXL_DECODER_DC0 ... CXL_DECODER_DC7:
> > > +		rc = dc_mode_to_region_index(mode);
> > > +		if (rc < 0)
> > > +			return rc;
> > 
> > Can't fail, so you could not bother checking..  Seems very unlikely
> > that function will gain other error cases in the future.
> 
> Sure, done.

Can dc_mode_to_region_index() be dropped altogether? Is there any
scenario where dc_mode_to_region_index() is really handling an anonymous
@mode argument? I.e. just replace all dc_mode_to_region_index() with
"mode - CXL_DECODER_DC0"?