netdev - Re: ERROR: "__umoddi3" [drivers/net/ethernet/mellanox/mlx5/core/mlx5

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Date:   Mon, 30 Sep 2019 18:29:10 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     linux-rdma@...r.kernel.org, Saeed Mahameed <saeedm@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>, netdev@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: ERROR: "__umoddi3"
 [drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko] undefined!

On Mon, Sep 30, 2019 at 05:45:35PM +0200, Michal Kubecek wrote:
> On Mon, Sep 30, 2019 at 04:13:17PM +0200, Borislav Petkov wrote:
> > I'm seeing this on i386 allyesconfig builds of current Linus master:
> > 
> > ERROR: "__umoddi3" [drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko] undefined!
> > make[1]: *** [__modpost] Error 1
> > make: *** [modules] Error 2
> 
> This is usually result of dividing (or modulo) by a 64-bit integer. Can
> you identify where (file and line number) is the __umoddi3() call
> generated?

Did another 32-bit allyesconfig build. It said:

ld: drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.o: in function `mlx5dr_icm_alloc_chunk':
dr_icm_pool.c:(.text+0x733): undefined reference to `__umoddi3'
make: *** [vmlinux] Error 1

The .s file then points to the exact location:

# drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c:140:   align_diff = icm_mr->icm_start_addr % align_base;
        pushl   %ebx    # align_base
        pushl   %ecx    # align_base
        call    __umoddi3       #
        popl    %edx    #
        popl    %ecx    #

HTH.

-- 
Regards/Gruss,
    Boris.

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