linux-kernel - Re: [PATCH v10 04/17] CXL/AER: Introduce CXL specific AER driver file

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Message-ID: <68829874e03a7_134cc710028@dwillia2-xfh.jf.intel.com.notmuch>
Date: Thu, 24 Jul 2025 13:32:52 -0700
From: <dan.j.williams@...el.com>
To: "Bowman, Terry" <terry.bowman@....com>, <dan.j.williams@...el.com>,
	<dave@...olabs.net>, <jonathan.cameron@...wei.com>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <bhelgaas@...gle.com>, <shiju.jose@...wei.com>,
	<ming.li@...omail.com>, <Smita.KoralahalliChannabasappa@....com>,
	<rrichter@....com>, <dan.carpenter@...aro.org>,
	<PradeepVineshReddy.Kodamati@....com>, <lukas@...ner.de>,
	<Benjamin.Cheatham@....com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	<linux-cxl@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v10 04/17] CXL/AER: Introduce CXL specific AER driver file

Bowman, Terry wrote:
> 
> 
> On 7/23/2025 7:01 PM, dan.j.williams@...el.com wrote:
> > Terry Bowman wrote:
> >> The CXL AER error handling logic currently resides in the AER driver file,
> >> drivers/pci/pcie/aer.c. CXL specific changes are conditionally compiled
> >> using #ifdefs.
> >>
> >> Improve the AER driver maintainability by separating the CXL specific logic
> >> from the AER driver's core functionality and removing the #ifdefs.
> >> Introduce drivers/pci/pcie/cxl_aer.c and move the CXL AER logic into the
> >> new file.
> >>
> >> Update the makefile to conditionally compile the CXL file using the
> >> existing CONFIG_PCIEAER_CXL Kconfig.
> >>
> >> Signed-off-by: Terry Bowman <terry.bowman@....com>
> > [..]
> >> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> >> index e2d71b6fdd84..31b3935bf189 100644
> >> --- a/include/linux/pci_ids.h
> >> +++ b/include/linux/pci_ids.h
> >> @@ -12,6 +12,8 @@
> >>  
> >>  /* Device classes and subclasses */
> >>  
> >> +#define PCI_CLASS_CODE_MASK             0xFFFF00
> > Per other comments do not add this updated in the same patch as the
> > move.
> >
> > When / if you submit it separately it likely also belongs next to
> > PCI_CLASS_REVISION in include/uapi/linux/pci_regs.h defined with
> > __GENMASK(23, 8).
> 
> include/uapi/linux/pci_regs.h appears to use all values without using GENMASK().
> Just adding as a note. I'm making the change.

pci_regs.h is in include/uapi/. Historically that meant that it was
unable to use GENMASK() from include/linux/. That changed "recently"
(compared to the age of pci_regs.h) with commit:

3c7a8e190bc5 uapi: introduce uapi-friendly macros for GENMASK