linux-kernel - Re: [PATCH v4 1/2] edac: Add an API for edac device to report for multiple errors

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Date:   Tue, 1 Oct 2019 09:47:07 +0000
From:   Robert Richter <rrichter@...vell.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Hanna Hawa <hhhawa@...zon.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "james.morse@....com" <james.morse@....com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dwmw@...zon.co.uk" <dwmw@...zon.co.uk>,
        "benh@...zon.com" <benh@...zon.com>,
        "ronenk@...zon.com" <ronenk@...zon.com>,
        "talel@...zon.com" <talel@...zon.com>,
        "jonnyc@...zon.com" <jonnyc@...zon.com>,
        "hanochu@...zon.com" <hanochu@...zon.com>
Subject: Re: [PATCH v4 1/2] edac: Add an API for edac device to report for
 multiple errors

On 01.10.19 10:32:42, Borislav Petkov wrote:

> ----------------------------------------------------------------------
> On Tue, Oct 01, 2019 at 06:56:58AM +0000, Robert Richter wrote:
> > It is *not* the counterpart. The __* version already has the...
> 
> Lemme cut to the chase:
> 
> "Make the main workhorse the "count" functions which can log a @count
> of errors. Have the current APIs edac_device_handle_{ce,ue}() call
> the _count() variants and this way keep the exported symbols number
> unchanged."
> 
> I want to see exactly *two* pairs of functions:
> 
> edac_device_handle_{ce,ue}_count	- logs a @count of errors
> edac_device_handle_{ce,ue}		- logs a single error
> 
> Not three pairs. I.e., the "__" versions are not needed.
> 
> > The first patch only adds functionality but keeps the abi. Thus it
> > makes a backport easier.
> 
> Works just the same with my version - single backport.

If you move to static inline for edac_device_handle_{ce,ue} the
symbols vanish and this breaks the abi. That's why the split in two
patches.

Your comment to not have a __ version as a third variant of the
interface makes sense to me. But to keep ABI your patch still needs to
be split. The first patch still must contain symbols for
edac_device_handle_{ce,ue}. I am not sure if ABI compatability is
something we want to make easier here. I personally like the approach.

-Robert