linux-kernel - Re: [PATCH v3 2/6] efi/cper: Export cper_mem_err

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Date:   Fri, 14 Apr 2023 14:44:51 +0200
From:   Robert Richter <rrichter@....com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
CC:     Terry Bowman <Terry.Bowman@....com>, <alison.schofield@...el.com>,
        <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <dave.jiang@...el.com>, <linux-cxl@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bhelgaas@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>, <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v3 2/6] efi/cper: Export cper_mem_err_unpack() for use by
 modules

On 14.04.23 12:48:05, Jonathan Cameron wrote:
> On Thu, 13 Apr 2023 14:40:10 -0500
> Terry Bowman <Terry.Bowman@....com> wrote:
> 
> > Hi Jonathan,
> > 
> > On 4/13/23 11:08, Jonathan Cameron wrote:
> > > On Tue, 11 Apr 2023 13:02:58 -0500
> > > Terry Bowman <terry.bowman@....com> wrote:
> > >   
> > >> The CXL driver plans to use cper_print_aer() for restricted CXL host (RCH)
> > >> logging. This is not currently possible if CXL is built as a loadable
> > >> module because cper_print_aer() depends on cper_mem_err_unpack() which
> > >> is not exported.
> > >>
> > >> Export cper_mem_err_unpack() to enable cper_print_aer() usage in
> > >> CXL and other loadable modules.  
> > > 
> > > No problem with the export, but I'm struggling to see the path that needs it.
> > > Could you give a little more detail, perhaps a call path?
> > >   
> > 
> > The cper_print_aer() is used to log RCH dport AER errors. This is needed 
> > because the RCH dport AER errors are not handled directly by the AER port 
> > driver. I'll add these details to the patch.
> 
> Ah. I wasn't particularly clear.  cper_print_aer() is fine, but oddly
> I'm not seeing where that results in a call to cper_mem_err_unpack()
> 
> More than possible my grep skills are failing me!

No worries, it is used in some odd tracepoint macro magic included
with ras_event.h.

-Robert