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

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Date:   Mon, 30 Mar 2020 20:40:44 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Subject: RE: Build regressions/improvements in v5.6

Hi Andy, Geert,

> -----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

-Alexey