linux-kernel - Re: Build regressions/improvements in v5.6

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Message-ID: <CAMuHMdWJ22zUkvMXBPBLoNhUkf0bnFBxa_WZAhiUWzA3r4eDkA@mail.gmail.com>
Date:   Mon, 30 Mar 2020 23:22:36 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: Build regressions/improvements in v5.6

Hi Vineet,

On Mon, Mar 30, 2020 at 11:18 PM Vineet Gupta
<Vineet.Gupta1@...opsys.com> wrote:
> On 3/30/20 1:40 PM, Alexey Brodkin wrote:
> >> -----Original Message-----
> >> From: Andy Shevchenko <andy.shevchenko@...il.com>
> >> Sent: Monday, March 30, 2020 4:28 PM
> >> To: Geert Uytterhoeven <geert@...ux-m68k.org>; Alexey Brodkin <abrodkin@...opsys.com>
> >> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
> >> Subject: Re: Build regressions/improvements in v5.6
> >>
> >> On Mon, Mar 30, 2020 at 4:26 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> >>>
> >>> Hi Andy,
> >>>
> >>> On Mon, Mar 30, 2020 at 3:08 PM Andy Shevchenko
> >>> <andy.shevchenko@...il.com> wrote:
> >>>> On Mon, Mar 30, 2020 at 12:00 PM Geert Uytterhoeven
> >>>> <geert@...ux-m68k.org> wrote:
> >>>>> Below is the list of build error/warning regressions/improvements in
> >>>>> v5.6[1] compared to v5.5[2].
> >>>>
> >>>>>   + /kisskb/src/include/linux/dev_printk.h: warning: format '%zu' expects argument of type
> >> 'size_t', but argument 8 has type 'unsigned int' [-Wformat=]:  => 232:23
> >>>>
> >>>> This is interesting... I checked all dev_WARN_ONCE() and didn't find an issue.
> >>>
> >>> arcv2/axs103_smp_defconfig
> >>>
> >>> It's probably due to a broken configuration for the arc toolchain.
> >>
> >> Alexey, do have any insight?
> >
> > I think I do have some but first I'd like to get it reproduced myself.
> > I just built v5.6 with help of both GCC 8.3.1- & 9.3.1-based toolchains
> > and didn't see a single warning. So I guess I was doing something wrong.
> >
> > FWIW
> >
> > 1. My GCC 8.3.1 toolchain was exactly this:
> > https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2019.09-release/arc_gnu_2019.09_prebuilt_uclibc_le_archs_linux_install.tar.gz
> >
> > 2. Linux kernel is vanilla v5.6.0
> >
> > 3. Configured and built as simple as:
> >    make axs103_smp_defconfig && make
>
> It seems the build service is using a arc toolchain built in 2016 :-)
>
> # < /opt/cross/kisskb/br-arcle-hs38-full-2016.08-613-ge98b4dd/bin/arc-linux-gcc
>
> Call it Murphy's law, same year a little later I'd fixed the same issue in gcc [1]
>
> [1] http://lists.infradead.org/pipermail/linux-snps-arc/2016-October/001661.html
>
> @Guenter could you please consider updating the ARC tools. FWIW you can build
> stuff off upstream gcc/binutils using build system of your choice.

This is not Günter's toolchain, but Michael's.

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