linux-kernel - Re: [PATCH 1/2] staging: octeon: delete driver

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Date:   Thu, 6 Feb 2020 09:18:48 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Chris Packham <Chris.Packham@...iedtelesis.co.nz>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "brandonbonaby94@...il.com" <brandonbonaby94@...il.com>,
        "julia.lawall@...6.fr" <julia.lawall@...6.fr>,
        "yuehaibing@...wei.com" <yuehaibing@...wei.com>,
        "paulburton@...nel.org" <paulburton@...nel.org>,
        "aaro.koskinen@....fi" <aaro.koskinen@....fi>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "fw@...len.de" <fw@...len.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ddaney@...iumnetworks.com" <ddaney@...iumnetworks.com>,
        "bobdc9664@...nam.cz" <bobdc9664@...nam.cz>,
        "sandro@...ery.com" <sandro@...ery.com>,
        "ivalery111@...il.com" <ivalery111@...il.com>,
        "ynezz@...e.cz" <ynezz@...e.cz>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "wambui.karugax@...il.com" <wambui.karugax@...il.com>
Subject: Re: [PATCH 1/2] staging: octeon: delete driver

Hi Günter,

On Wed, Feb 5, 2020 at 2:52 PM Guenter Roeck <linux@...ck-us.net> wrote:
> On 2/5/20 1:03 AM, Geert Uytterhoeven wrote:
> > On Wed, Feb 5, 2020 at 4:57 AM Guenter Roeck <linux@...ck-us.net> wrote:
> >> On 2/4/20 7:34 PM, Dan Carpenter wrote:
> >>> On Tue, Feb 04, 2020 at 12:31:16PM -0800, Matthew Wilcox wrote:
> >>>> On Tue, Feb 04, 2020 at 08:06:14PM +0000, Chris Packham wrote:
> >>>>> On Tue, 2020-02-04 at 07:09 +0000, gregkh@...uxfoundation.org wrote:
> >>>>>> On Tue, Feb 04, 2020 at 04:02:15AM +0000, Chris Packham wrote:
> >>>>> On Tue, 2020-02-04 at 10:21 +0300, Dan Carpenter wrote:
> >>>>>> My advice is to delete all the COMPILE_TEST code.  That stuff was a
> >>>>>> constant source of confusion and headaches.
> >>>>>
> >>>>> I was also going to suggest this. Since the COMPILE_TEST has been a
> >>>>> source of trouble I was going to propose dropping the || COMPILE_TEST
> >>>>> from the Kconfig for the octeon drivers.
> >>>>
> >>>> Not having it also causes problems.  I didn't originally add it for
> >>>> shits and giggles.
> >>>
> >>> I wonder if the kbuild bot does enough cross compile build testing these
> >>> days to detect compile problems.  It might have improved to the point
> >>> where COMPILE_TEST isn't required.
> >
> > It depends...
> >
> >> Not really. Looking at the build failures in the mainline kernel right now:
> >>
> >> Failed builds:
> >>          alpha:allmodconfig
> >>          arm:allmodconfig
> >>          i386:allyesconfig
> >>          i386:allmodconfig
> >>          m68k:allmodconfig
> >>          microblaze:mmu_defconfig
> >>          mips:allmodconfig
> >>          parisc:allmodconfig
> >>          powerpc:allmodconfig
> >>          s390:allmodconfig
> >>          sparc64:allmodconfig
> >
> > I did receive a report from noreply@...erman.id.au for the m68k build
> > failure. But that was sent to me only, not to the offender, and I do my
> > own builds anyway.
> >
> > More interesting, that report happened after the offending commit landed
> > upstream, while it had been in next for 4 weeks.
>
> m68k in -next builds fine for me, and did for a while. I have not seen a build
> failure there. There must be a context commit causing this failure, or what
> is (or was) in -next differs from what is in mainline.

Indeed. The offending symbol depended on another symbol, which never
made it to next before it hit mainline, thus hiding the issue.

> >> Many of those don't even _have_ specific configurations causing the build failures.
> >
> > Exactly. These are the "easy" ones, as the all*config builds enable as
> > much infrastructure as possible.  It's much harder if some common
> > dependency is not fulfilled in some specific config.
>
> Yes, that is correct. But that doesn't mean that it would be a good idea
> to retire COMPILE_TEST.

I agree.

Retiring COMPILE_TEST could have a positive side-effect, though: it
would reduce the compile time for all*config, which might give the
overloaded build bots spare cycles to cover other configs.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds