linux-kernel - Re: [PATCH net-next] mlxsw: Fix 64-bit division in mlxsw_sp_sb_prs

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Message-ID: <20191031061213.GA30422@splinter>
Date:   Thu, 31 Oct 2019 06:12:15 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     Nathan Chancellor <natechancellor@...il.com>
CC:     Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] mlxsw: Fix 64-bit division in
 mlxsw_sp_sb_prs_init

On Wed, Oct 30, 2019 at 09:01:52AM -0700, Nathan Chancellor wrote:
> When building for 32-bit ARM, there is a link time error because of a
> 64-bit division:
> 
> ld.lld: error: undefined symbol: __aeabi_uldivmod
> >>> referenced by spectrum_buffers.c
> >>>               net/ethernet/mellanox/mlxsw/spectrum_buffers.o:(mlxsw_sp_buffers_init) in archive drivers/built-in.a
> >>> did you mean: __aeabi_uidivmod
> >>> defined in: arch/arm/lib/lib.a(lib1funcs.o
> 
> Avoid this by using div_u64, which is designed to avoid this problem.
> 
> Fixes: bc9f6e94bcb5 ("mlxsw: spectrum_buffers: Calculate the size of the main pool")
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Reviewed-by: Ido Schimmel <idosch@...lanox.com>
Tested-by: Ido Schimmel <idosch@...lanox.com>

Thanks, Nathan!