netdev - Re: [PATCH] ptp_qoriq: fix overflow in ptp_qoriq

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Date:   Thu, 25 Mar 2021 13:16:57 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     linux@...ck-us.net
Cc:     yangbo.lu@....com, netdev@...r.kernel.org, richardcochran@...il.com
Subject: Re: [PATCH] ptp_qoriq: fix overflow in ptp_qoriq_adjfine() u64
 calcalation

From: Guenter Roeck <linux@...ck-us.net>
Date: Thu, 25 Mar 2021 03:23:07 -0700

> mul_u64_u64_div_u64() is not exported. As result, every build with
> CONFIG_PTP_1588_CLOCK_QORIQ=m (ie every allmodconfig build) fails with:
> 
> ERROR: modpost: "mul_u64_u64_div_u64" [drivers/ptp/ptp-qoriq.ko] undefined!
> 
> or a similar error.

I fixed this with a follow-up commit to export the symbol.