linux-kernel - Re: [PATCH v3 3/7] drivers: parisc: Avoids building driver if CONFIG

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Date:   Fri, 28 Sep 2018 09:15:15 +0200
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Leonardo Brás <leobras.c@...il.com>,
        lkcamp@...ts.libreplanetbr.org
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Finn Thain <fthain@...egraphics.com.au>,
        Robert Richter <rric@...nel.org>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        oprofile-list@...ts.sf.net, linux-parisc@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH v3 3/7] drivers: parisc: Avoids building driver if
 CONFIG_PARISC is disabled

On Thu, 2018-09-27 at 23:08 -0300, Leonardo Brás wrote:
> Avoids building driver if 'make drivers/parisc/' is called and
> CONFIG_PARISC is disabled.

Is that really a problem? The drivers/Makefile has this:

obj-$(CONFIG_PARISC)		+= parisc/ 
And you just overrode that by forcing the build.  It's not even clear
we should refuse the build in that case; how would we know you don't
have a legitimate reason for the override? 

Signed-off-by: Leonardo Brás <leobras.c@...il.com>
> ---
>  drivers/parisc/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/parisc/Makefile b/drivers/parisc/Makefile
> index 3cd5e6cb8478..80049d763aa0 100644
> --- a/drivers/parisc/Makefile
> +++ b/drivers/parisc/Makefile
> @@ -24,5 +24,5 @@ obj-$(CONFIG_EISA)		+= eisa.o
> eisa_enumerator.o eisa_eeprom.o
>  obj-$(CONFIG_SUPERIO)		+= superio.o
>  obj-$(CONFIG_CHASSIS_LCD_LED)	+= led.o
>  obj-$(CONFIG_PDC_STABLE)	+= pdc_stable.o
> -obj-y				+= power.o
> +obj-$(CONFIG_PARISC)		+= power.o

If we conclude the use case is legitimate, that's not enough: the two
inner symbols are PARISC only but CONFIG_EISA isn't.

James