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

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Date:   Wed, 3 Oct 2018 21:31:39 -0300
From:   Leonardo Bras <leobras.c@...il.com>
To:     James Bottomley <James.Bottomley@...senpartnership.com>
Cc:     lkcamp@...ts.libreplanetbr.org,
        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 <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 Fri, Sep 28, 2018 at 4:15 AM James Bottomley
<James.Bottomley@...senpartnership.com> wrote:
>
> 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?
>

Sorry I did not explained my reasons earlier. I sent everybody involved an
e-mail explaining the full reason of this change.
(For reference it's here: https://lkml.org/lkml/2018/10/3/707)

> 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.

You are right.
It worked for my needs because I am only building the drivers, and not
linking them. But i believe doing something like I did in zorro/Makefile
would fix this all. (For reference, https://lkml.org/lkml/2018/9/28/150 )

If you agree, I will send the next patchset with this change.

Thanks for your help!

Leonardo Bras