linux-kernel - Re: arm32 build failure after 992aa864dca068554802a65a467a2640985cc213

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Date:   Tue, 18 Jun 2019 12:05:56 +0000
From:   Shalom Toledo <shalomt@...lanox.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>
CC:     Petr Machata <petrm@...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: arm32 build failure after
 992aa864dca068554802a65a467a2640985cc213

On 18/06/2019 4:46, Nathan Chancellor wrote:
> Hi all,
> 
> A 32-bit ARM allyesconfig fails to link after commit 992aa864dca0
> ("mlxsw: spectrum_ptp: Add implementation for physical hardware clock
> operations") because of 64-bit division:
> 
> arm-linux-gnueabi-ld:
> drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.o: in function
> `mlxsw_sp1_ptp_phc_settime':
> spectrum_ptp.c:(.text+0x39c): undefined reference to `__aeabi_uldivmod'
> 
> The following diff fixes it but I have no idea if it is proper or not
> (hence reaching out before sending it, in case one of you has a more
> proper idea).
> 
> Cheers,
> Nathan
> 
> ---
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
> index 2a9bbc90225e..65686f0b6834 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
> @@ -87,7 +87,7 @@ mlxsw_sp1_ptp_phc_settime(struct mlxsw_sp_ptp_clock *clock, u64 nsec)
>         u32 next_sec;
>         int err;
>  
> -       next_sec = nsec / NSEC_PER_SEC + 1;
> +       next_sec = (u32)div64_u64(nsec, NSEC_PER_SEC + 1);
>         next_sec_in_nsec = next_sec * NSEC_PER_SEC;
>  
>         spin_lock(&clock->lock);
> 
> 



Thanks for the report. I will send a fix.