linux-kernel - Re: [PATCH v2 08/12] macintosh/via-pmu68k: Don't load driver on unsupported hardware

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Message-ID: <e1006b0a-a429-4744-7525-203cb91f1d5f@gmail.com>
Date:   Sat, 9 Jun 2018 19:55:05 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Finn Thain <fthain@...egraphics.com.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-m68k@...ts.linux-m68k.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v2 08/12] macintosh/via-pmu68k: Don't load driver on
 unsupported hardware

Hi Andreas,

Am 09.06.2018 um 19:14 schrieb Andreas Schwab:
> On Jun 09 2018, Michael Schmitz <schmitzmic@...il.com> wrote:
>
>> Hi Finn,
>>
>> Am 08.06.2018 um 14:24 schrieb Finn Thain:
>>> Don't load the via-pmu68k driver on early PowerBooks. The M50753 PMU
>>> device found in those models was never supported by this driver.
>>> Attempting to load the driver usually causes a boot hang.
>>>
>>> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
>>> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
>>> ---
>>>  arch/m68k/mac/misc.c           | 6 ++----
>>>  drivers/macintosh/via-pmu68k.c | 4 ----
>>>  include/uapi/linux/pmu.h       | 1 -
>>>  3 files changed, 2 insertions(+), 9 deletions(-)
>> ...
>>> diff --git a/include/uapi/linux/pmu.h b/include/uapi/linux/pmu.h
>>> index 89cb1acea93a..30f64d46f5db 100644
>>> --- a/include/uapi/linux/pmu.h
>>> +++ b/include/uapi/linux/pmu.h
>>> @@ -93,7 +93,6 @@ enum {
>>>  	PMU_HEATHROW_BASED,	/* PowerBook G3 series */
>>>  	PMU_PADDINGTON_BASED,	/* 1999 PowerBook G3 */
>>>  	PMU_KEYLARGO_BASED,	/* Core99 motherboard (PMU99) */
>>> -	PMU_68K_V1,		/* 68K PMU, version 1 */
>>>  	PMU_68K_V2, 		/* 68K PMU, version 2 */
>>>  };
>>
>> Is this enum used by any user space code? If so, perhaps rather leave the
>> PMU_68K_V1 in there to avoid upsetting that?
>
> It also changes the value of PMU_68K_V2, which is an ABI break.

Yes, that's what I worry about - but do we know of any users of that 
particular interface?

Cheers,

	Michael

>
> Andreas.
>