linux-kernel - Re: {standard input}:3978: Error: value 178 out of range

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Date:   Fri, 10 Jun 2022 10:46:21 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Sumit Saxena <sumit.saxena@...adcom.com>, kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>
Subject: Re: {standard input}:3978: Error: value 178 out of range

On Fri, Jun 10, 2022 at 2:47 AM kernel test robot <lkp@...el.com> wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   6bfb56e93bcef41859c2d5ab234ffd80b691be35
> commit: 43ca110050988c7a0e581d24ce212ef34a4cdf29 scsi: mpi3mr: Add support for PEL commands
> date:   5 weeks ago
> config: m68k-randconfig-r036-20220608 (https://download.01.org/0day-ci/archive/20220610/202206100855.uY63FJUH-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 11.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43ca110050988c7a0e581d24ce212ef34a4cdf29
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 43ca110050988c7a0e581d24ce212ef34a4cdf29
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
>    {standard input}: Assembler messages:
> >> {standard input}:3978: Error: value 178 out of range
> >> {standard input}:3978: Error: value of 178 too large for field of 1 byte at 00000fdb

This failure happens while building drivers/scsi/mpi3mr/mpi3mr_fw.o.

How to check:

    make ARCH=m68k drivers/scsi/mpi3mr/mpi3mr_fw.s
    make ARCH=m68k V=1 drivers/scsi/mpi3mr/mpi3mr_fw.o

Run the output from the last command with mpi3mr_fw.c by mpi3mr_fw.s,
so you will get sensible line numbers:

    drivers/scsi/mpi3mr/mpi3mr_fw.s: Assembler messages:
    drivers/scsi/mpi3mr/mpi3mr_fw.s:1849: Error: value -168 out of range
    drivers/scsi/mpi3mr/mpi3mr_fw.s:1849: Error: value of -168 too
large for field of 1 byte at 3175

Note that the value differs, but I'm using a different compiler
(gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04)).

The offending instruction is:

    | drivers/scsi/mpi3mr/mpi3mr_fw.c:299:  switch (host_tag) {
            mvz.w %d2,%d0   | tmp160, host_tag
            mov3q.l #5,%d1  |,
            cmp.l %d0,%d1   | host_tag,
            jcs .L154               |
            tst.w %d6       | host_tag
            jeq .L133               |
            subq.l #2,%d2   |, tmp238
            mvz.w %d2,%d2   | tmp238, tmp240
            mov3q.l #3,%d0  |,
            cmp.l %d2,%d0   | tmp240,
            jcs .L140               |
            add.l %d2,%d2   | tmp244
>>>         move.w .L155(%pc,%d2.l),%d0     |, tmp245
            jra .L186               |

And the table L155 is just too far from the above instruction, so
the displacement is too large, causing the failure.

Looks like a compiler bug to me?

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