linux-kernel - Re: [PATCH 0/8] nvmem: Let layout drivers be modules

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Date:   Mon, 06 Mar 2023 15:23:50 +0100
From:   Rafał Miłecki <rafal@...ecki.pl>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Michael Walle <michael@...le.cc>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Robert Marko <robert.marko@...tura.hr>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 0/8] nvmem: Let layout drivers be modules

On 2023-03-06 15:18, Miquel Raynal wrote:
> Hi Rafał,
> 
> rafal@...ecki.pl wrote on Mon, 06 Mar 2023 14:57:03 +0100:
> 
>> On 2023-03-06 14:35, Miquel Raynal wrote:
>> > Hi Michael,
>> >
>> > michael@...le.cc wrote on Mon, 06 Mar 2023 14:01:34 +0100:
>> >
>> >> > Miquel Raynal (8):
>> >> >   of: Fix modalias string generation
>> >> >   of: Change of_device_get_modalias() main argument
>> >> >   of: Create an of_device_request_module() receiving an OF node
>> >> >   nvmem: core: Fix error path ordering
>> >> >   nvmem: core: Handle the absence of expected layouts
>> >> >   nvmem: core: Request layout modules loading
>> >> >   nvmem: layouts: sl28vpd: Convert layout driver into a module
>> >> >   nvmem: layouts: onie-tlv: Convert layout driver into a module
>> >> >> With the fixes series [1] applied:
>> >
>> > Thanks for the series! Looks good to me. I believe both series can live
>> > in separate tress, any reason why we would like to avoid this? I am > keen
>> > to apply [1] into the mtd tree rather soon.
>> 
>> Given past events with nvmem patches I'm against that.
>> 
>> Let's wait for Srinivas to collect pending patches, let them spend a
>> moment in linux-next maybe, ask Srinivas to send them to Greg early if
>> he can. That way maybe you can merge Greg's branch (assuming he 
>> doesn't
>> rebase).
> 
> Just to be on the same page, we're talking about the mtd core fixups to
> handle correctly probe deferrals in the nvmem side.
> 
> Applying mtd patches then nvmem patches is totally fine in this order.
> Applying nvmem patches and then mtd patches creates a range of commits
> where some otp devices might have troubles probing if:
> - a layout driver is used
> - the driver is compiled as a module
> - the driver is also not installed in an initramfs
> 
> I was actually asking out loud whether we should care about this
> commit range given the unlikelihood that someone would have troubles
> with this while bisecting a linux-next kernel.
> 
> So getting an immutable tag from Greg would not help. The opposite
> might make sense though, and involves that I apply [1] to mtd/next
> rather soon anyway, I guess?

The problem IIUC is nvmem.git / for-next containing broken code after
adding nvmem stuff. That is unless Srinivas takes your patches in some
way. Hopefully not by waiting for 6.4-rc1.