linux-kernel - Re: [PATCH v2] ftrace: avoid potential division by zero

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Message-ID: <CAMrEMU8wB4c0TFTSJ4ixQg_gSnW72n_T3ip8ZfZFAk8xWjaKsA@mail.gmail.com>
Date:   Fri, 3 Jan 2020 00:00:23 -0800
From:   Justin Capella <justincapella@...il.com>
To:     Wen Yang <wenyang@...ux.alibaba.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, xlpang@...ux.alibaba.com,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ftrace: avoid potential division by zero

> -               do_div(stddev, rec->counter * (rec->counter - 1) * 1000);
>
> +               stddev = div64_ul(stddev,
> +                                 rec->counter * (rec->counter - 1) * 1000);


Is a rec->counter > 1 assertion needed here?