linux-kernel - Re: [PATCH RESEND v3 13/17] EDAC/mc: Add MC unique index allocation procedure

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Date:   Wed, 12 Oct 2022 13:44:59 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Michal Simek <michal.simek@...inx.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Michail Ivanov <Michail.Ivanov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Punnaiah Choudary Kalluri 
        <punnaiah.choudary.kalluri@...inx.com>,
        Manish Narani <manish.narani@...inx.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v3 13/17] EDAC/mc: Add MC unique index allocation
 procedure

On Wed, Oct 12, 2022 at 10:33:35PM +0200, Borislav Petkov wrote:
> On Wed, Oct 12, 2022 at 11:01:54PM +0300, Serge Semin wrote:

> "A new special MC index is introduced here. It's defined by the
> EDAC_AUTO_MC_NUM macro with a value specifically chosen as the least
> probable value used for the real MC index. In case if the EDAC_AUTO_MC_NUM
> index is specified by the EDAC LLDD, the MC index will be either retrieved
> from the MC device OF-node alias index ("mc[:number:]") or automatically
> generated as the next-free MC index found by the ID allocation procedure."

Just curious.If I have an EDAC driver using EDAC_AUTO_MC_NUM, and I
unload and reload the driver a bunch of times. Do I get the same memory
controller numbers each reload, or get an ever increasing set each time?

-Tony