linux-kernel - Re: [PATCH 1/3] clk: tegra: refactor 7.1 div calculation

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Date:   Wed, 4 Jul 2018 10:51:48 +0300
From:   Aapo Vienamo <avienamo@...dia.com>
To:     Peter Geis <pgwipeout@...il.com>
CC:     Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        "Stephen Boyd" <sboyd@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 1/3] clk: tegra: refactor 7.1 div calculation

On Tue, 3 Jul 2018 11:10:21 -0400
Peter Geis <pgwipeout@...il.com> wrote:

> Good Morning,
> 
> Just a heads up.
> During compilation with your patches, I get the following warning:
> 
> In file included from ./arch/arm/include/asm/div64.h:127:0,
>                   from ./include/linux/kernel.h:174,
>                   from drivers/clk/tegra/div71.c:17:
> drivers/clk/tegra/div71.c: In function ‘div71_get’:
> ./include/asm-generic/div64.h:222:28: warning: comparison of distinct 
> pointer types lacks a cast
>    (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
>                              ^
> drivers/clk/tegra/div71.c:40:2: note: in expansion of macro ‘do_div’
>    do_div(divider_ux1, rate);
>    ^~~~~~
> 
> Very Respectfully,
> Peter Geis
> 
 
That's indeed true. Looks like this warning is produced only on 32-bit
arm as it uses a different variant of the do_div macro than arm64.

Thanks,
 -Aapo