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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Tue, 3 Dec 2019 11:14:54 +0100
Message-ID: <CAMuHMdXDLfCUnNevNqGXUrtwa11yvyBn0Semq6EOPuJKtnwgLg@mail.gmail.com>
Subject: Re: [PATCH v4 1/2] drivers: move the early platform device support to arch/sh
To:     Bartosz Golaszewski <brgl@bgdev.pl>
Cc:     Guenter Roeck <linux@roeck-us.net>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jiri Slaby <jslaby@suse.com>,
        Linux-sh list <linux-sh@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>
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Hi Bartosz, Günter,

On Tue, Dec 3, 2019 at 10:50 AM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> wt., 3 gru 2019 o 06:24 Guenter Roeck <linux@roeck-us.net> napisał(a):
> > On 12/2/19 9:18 AM, Bartosz Golaszewski wrote:
> > > pon., 2 gru 2019 o 14:03 Guenter Roeck <linux@roeck-us.net> napisał(a):
> > >>
> > >> On 12/1/19 11:40 PM, Bartosz Golaszewski wrote:
> > >>> pon., 2 gru 2019 o 05:14 Guenter Roeck <linux@roeck-us.net> napisał(a):
> > >>>>
> > >>>> On Thu, Oct 03, 2019 at 11:29:12AM +0200, Bartosz Golaszewski wrote:
> > >>>>> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > >>>>>
> > >>>>> SuperH is the only user of the current implementation of early platform
> > >>>>> device support. We want to introduce a more robust approach to early
> > >>>>> probing. As the first step - move all the current early platform code
> > >>>>> to arch/sh.
> > >>>>>
> > >>>>> In order not to export internal drivers/base functions to arch code for
> > >>>>> this temporary solution - copy the two needed routines for driver
> > >>>>> matching from drivers/base/platform.c to arch/sh/drivers/platform_early.c.
> > >>>>>
> > >>>>> Also: call early_platform_cleanup() from subsys_initcall() so that it's
> > >>>>> called after all early devices are probed.
> > >>>>>
> > >>>>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > >>>>
> > >>>> Wondering ... has anyone tested this patch on affected hardware ?
> > >>>> All my qemu boot tests (both sh and sheb) fail because of it.
> > >>>> Bisect log below.
> > >>>>
> > >>>> Guenter
> > >>>>
> > >>>> ---
> > >>>> # bad: [72c0870e3a05d9cd5466d08c3d2a3069ed0a2f9f] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
> > >>>> # good: [89d57dddd7d319ded00415790a0bb3c954b7e386] Merge tag 'media/v5.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
> > >>>> git bisect start 'HEAD' '89d57dddd7d3'
> > >>>> # good: [0a6cad5df541108cfd3fbd79eef48eb824c89bdc] Merge branch 'vmwgfx-coherent' of git://people.freedesktop.org/~thomash/linux into drm-next
> > >>>> git bisect good 0a6cad5df541108cfd3fbd79eef48eb824c89bdc
> > >>>> # bad: [9a3d7fd275be4559277667228902824165153c80] Merge tag 'driver-core-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
> > >>>> git bisect bad 9a3d7fd275be4559277667228902824165153c80
> > >>>> # good: [59274c7164807d27b24e6c068dfe734f7bea4623] Merge tag 'usb-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
> > >>>> git bisect good 59274c7164807d27b24e6c068dfe734f7bea4623
> > >>>> # good: [e71903106721dc53923e90aa484d78bc86c039a9] staging: mt7621-dma: align to match open parenthesis
> > >>>> git bisect good e71903106721dc53923e90aa484d78bc86c039a9
> > >>>> # good: [8f56e4ebe05c26c30e167519273843476e39e244] Merge tag 'char-misc-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
> > >>>> git bisect good 8f56e4ebe05c26c30e167519273843476e39e244
> > >>>> # good: [8bde9f3d2a217d1635a7c7bdf8ad4c25c9a34b50] Merge tag 'iio-for-5.5c' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
> > >>>> git bisect good 8bde9f3d2a217d1635a7c7bdf8ad4c25c9a34b50
> > >>>> # bad: [0628cda318df6baec439ca6e6e274007492f1ccd] mac80211: Use debugfs_create_xul() helper
> > >>>> git bisect bad 0628cda318df6baec439ca6e6e274007492f1ccd
> > >>>> # bad: [03324507e66c7664c754b1ef92c5c3be24c78aa2] driver core: Allow fwnode_operations.add_links to differentiate errors
> > >>>> git bisect bad 03324507e66c7664c754b1ef92c5c3be24c78aa2
> > >>>> # bad: [313f5dbba41d905d59c820bb2d91ee6c661aff99] debugfs: remove return value of debugfs_create_u16()
> > >>>> git bisect bad 313f5dbba41d905d59c820bb2d91ee6c661aff99
> > >>>> # good: [d4387cd117414ba80230f27a514be5ca4a09cfcc] of: property: Create device links for all child-supplier depencencies
> > >>>> git bisect good d4387cd117414ba80230f27a514be5ca4a09cfcc
> > >>>> # bad: [c31e73121f4c1ec45a3e523ac6ce3ce6dafdcec1] base: soc: Handle custom soc information sysfs entries
> > >>>> git bisect bad c31e73121f4c1ec45a3e523ac6ce3ce6dafdcec1
> > >>>> # bad: [201e91091b1d47047f55580b5474e1239f4d17aa] sh: add the sh_ prefix to early platform symbols
> > >>>> git bisect bad 201e91091b1d47047f55580b5474e1239f4d17aa
> > >>>> # bad: [507fd01d5333338753a1cc26322dfc9f856c109f] drivers: move the early platform device support to arch/sh
> > >>>> git bisect bad 507fd01d5333338753a1cc26322dfc9f856c109f
> > >>>> # first bad commit: [507fd01d5333338753a1cc26322dfc9f856c109f] drivers: move the early platform device support to arch/sh
> > >>>
> > >>> Hi Guenter,
> > >>>
> > >>> can you post some bootlogs? Is it the same problem everywhere?
> > >>>
> > >>
> > >> I don't have any useful logs. The boot fails too early for that.
> > >>
> > >
> > > Yeah, it touched "early" devices after all...
> > >
> > >> Sorry, I don't understand "everywhere". It fails in mainline and -next, if that is what you mean.
> > >
> > > I referred to "All my qemu boot tests" when saying everywhere.
> > >
> > > I don't have any relevant HW - the idea for this patch is to stop
> > > compiling for everyone a bunch of code that's only used by one largely
> > > irrelevant architecture and free the namespace for a generic early
> > > platform drivers implementation.
> > >
> > > How are you creating your SH qemu images? I'm seeing there's something
> > > in buildroot for superh - maybe I'll be able to bearly_platform_cleanupuild something
> > > useful.
> > >
> >
> > Below is a possible fix. As I had suspected, the call to early_platform_cleanup()
> > is in the wrong place.
> >
>
> This makes sense. If it fixes the issue - do you want to send it to Greg?

Which tree does this patch apply to?
Oh, it's whitespace-damaged.

After applying it manually on top of current Linus' tree, (remote)
SH7722-based Migo-R boots again, so
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

There's still an issue with crashing userspace, but that happens on v5.4
too. Bisecting...

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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