linux-kernel - Re: Build regressions/improvements in v5.4-rc2

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Date:   Tue, 8 Oct 2019 09:28:33 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Daney <david.daney@...ium.com>
Subject: Re: Build regressions/improvements in v5.4-rc2

Hi Randy,

On Tue, Oct 8, 2019 at 1:41 AM Randy Dunlap <rdunlap@...radead.org> wrote:
> On 10/7/19 2:04 PM, Geert Uytterhoeven wrote:
> > On Mon, Oct 7, 2019 at 10:48 PM Randy Dunlap <rdunlap@...radead.org> wrote:
> >> On 10/7/19 12:18 AM, Geert Uytterhoeven wrote:
> >>> Below is the list of build error/warning regressions/improvements in
> >>> v5.4-rc2[1] compared to v5.3[2].
> >>>
> >>> Summarized:
> >>>   - build errors: +10/-3
> >>>   - build warnings: +152/-143
> >>>
> >>> JFYI, when comparing v5.4-rc2[1] to v5.4-rc1[3], the summaries are:
> >>>   - build errors: +5/-10
> >>>   - build warnings: +44/-133
> >>>
> >>> Note that there may be false regressions, as some logs are incomplete.
> >>> Still, they're build errors/warnings.
> >>>
> >>> Happy fixing! ;-)
> >>>
> >>> Thanks to the linux-next team for providing the build service.
> >>>
> >>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/da0c9ea146cbe92b832f1b0f694840ea8eb33cce/ (233 out of 242 configs)
> >>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/4d856f72c10ecb060868ed10ff1b1453943fc6c8/ (all 242 configs)
> >>> [3] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c/ (233 out of 242 configs)
> >>>
> >>>
> >>> *** ERRORS ***
> >>>
> >>> 10 error regressions:
> >>
> >>>   + error: "__delay" [drivers/net/phy/mdio-cavium.ko] undefined!:  => N/A
> >>
> >> Hi Geert,
> >>
> >> What arch & config is the above build error from?
> >
> > That was a new one in v5.4-rc1 for sh-allmodconfig (blamed on David Daney).
>
> so it seems arch/sh/ needs include/asm/delay.h that at least does
> #include <asm-generic/delay.h>
>
> eh?

__delay() is an internal implementation detail on several architectures.

include/asm-generic/delay.h says:

    /* Undefined functions to get compile-time errors */
    ...
    extern void __delay(unsigned long loops);

drivers/net/phy/mdio-cavium.c calls __delay() directly to wait n "clocks",
which is not portable.  It should use one of [nmu]delay() instead.

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