linux-kernel - Re: [PATCH v8 01/25] scsi/atari_scsi: Don't select CONFIG

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Message-ID: <a170720a-fe17-744d-790b-e258465bd75e@gmail.com>
Date:   Sat, 29 Dec 2018 14:33:00 +1300
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Finn Thain <fthain@...egraphics.com.au>,
        LEROY Christophe <christophe.leroy@....fr>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-m68k@...ts.linux-m68k.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v8 01/25] scsi/atari_scsi: Don't select CONFIG_NVRAM

Hi Finn,

Am 29.12.2018 um 14:06 schrieb Finn Thain:
> On Fri, 28 Dec 2018, LEROY Christophe wrote:
>>> diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
>>> index 89f5154c40b6..99e5729d910d 100644
>>> --- a/drivers/scsi/atari_scsi.c
>>> +++ b/drivers/scsi/atari_scsi.c
>>> @@ -755,9 +755,10 @@ static int __init atari_scsi_probe(struct
>>> platform_device *pdev)
>>>  	if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0)
>>>  		atari_scsi_template.sg_tablesize = setup_sg_tablesize;
>>>
>>> -	if (setup_hostid >= 0) {
>>> +	if (setup_hostid >= 0)
>>>  		atari_scsi_template.this_id = setup_hostid & 7;
>>> -	} else {
>>> +#ifdef CONFIG_NVRAM
>>> +	else
>>
>> Such ifdefs should be avoided in C files.
>> It would be better to use
>>
>> } else if (IS_ENABLED(CONFIG_NVRAM)) {
>>
>
> I don't like #ifdefs either. However, as the maintainer of this file, I am
> okay with this one.
>
> The old #ifdef CONFIG_NVRAM conditional compilation convention that gets
> used here and under drivers/video/fbdev could probably be improved upon
> but I consider this to be out-of-scope for this series, which is
> complicated enough.
>
> And as explained in the commit log, CONFIG_NVRAM=y and CONFIG_NVRAM=m are
> treaded differently by drivers. Therefore, IS_ENABLED would be incorrect.

IS_BUILTIN(CONFIG_NVRAM) is probably what Christophe really meant to 
suggest.

Or (really going out on a limb here):

IS_BUILTIN(CONFIG_NVRAM) ||
( IS_MODULE(CONFIG_ATARI_SCSI) && IS_ENABLED(CONFIG_NVRAM) )

Not that I'd advocate that, for this series.

Cheers,

	Michael