linux-kernel - Re: [PATCH 11/16] powerpc: vio_cmo: use dev_groups and not dev_attrs for bus

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Date:   Fri, 09 Jun 2017 08:53:22 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Vineet Gupta <vgupta@...opsys.com>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Johan Hovold <johan@...nel.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 11/16] powerpc: vio_cmo: use dev_groups and not dev_attrs for bus_type

Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:

> On Thu, Jun 08, 2017 at 11:12:10PM +1000, Michael Ellerman wrote:
>> Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:
>> 
>> > The dev_attrs field has long been "depreciated" and is finally being
>> > removed, so move the driver to use the "correct" dev_groups field
>> > instead for struct bus_type.
>> >
>> > Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> > Cc: Paul Mackerras <paulus@...ba.org>
>> > Cc: Michael Ellerman <mpe@...erman.id.au>
>> > Cc: Vineet Gupta <vgupta@...opsys.com>
>> > Cc: Bart Van Assche <bart.vanassche@...disk.com>
>> > Cc: Robin Murphy <robin.murphy@....com>
>> > Cc: Joerg Roedel <jroedel@...e.de>
>> > Cc: Johan Hovold <johan@...nel.org>
>> > Cc: Alexey Kardashevskiy <aik@...abs.ru>
>> > Cc: Krzysztof Kozlowski <krzk@...nel.org>
>> > Cc: <linuxppc-dev@...ts.ozlabs.org>
>> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> > ---
>> >  arch/powerpc/platforms/pseries/vio.c | 37 +++++++++++++++++++++---------------
>> >  1 file changed, 22 insertions(+), 15 deletions(-)
>> 
>> This one needed a bit more work to get building, the incremental diff is
>> below. We need a forward declaration of name, devspec and modalias,
>> which is a bit weird, but that's how the code is currently structured.
>> And there's dev and bus attributes with the same name, so that needed an
>> added "bus".
>> 
>> I booted v2 of patch 10 and this one and everything looks identical to
>> upstream.
>
> Ah, many thanks, this was on my todo list to fix up today.
>
> But you renamed the sysfs files when you added "bus" to the function
> names, are you sure you want to do that?  I don't mind, but if you
> happen to have userspace tools that look at those files, they just broke
> :(

Ugh crap, no that won't work.

I didn't see it when I tested because my machine doesn't have the CMO
feature enabled.

I guess we have to open code some of the BUS_ATTR_RO() etc. so we can
avoid the name clash.

I'll try and get it fixed later today.

cheers