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

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Date:   Sat, 29 Dec 2018 17:55:02 +0100
From:   LEROY Christophe <christophe.leroy@....fr>
To:     Michael Schmitz <schmitzmic@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-m68k@...ts.linux-m68k.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Finn Thain <fthain@...egraphics.com.au>
Subject: Re: [PATCH v8 01/25] scsi/atari_scsi: Don't select CONFIG_NVRAM

Michael Schmitz <schmitzmic@...il.com> a écrit :

> 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.

Doesn't #ifdef means either y or m ? So the same as IS_ENABLED() ?

Christophe

>
> 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