netdev - Re: [PATCH] iwlwifi: fix 64-bit division

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Date:   Thu,  7 Mar 2019 17:15:25 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Avraham Stern <avraham.stern@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iwlwifi: fix 64-bit division

Arnd Bergmann <arnd@...db.de> wrote:

> do_div() expects unsigned operands and otherwise triggers a warning like:
> 
> drivers/net/wireless/intel/iwlwifi/mvm/ftm-initiator.c:465:2: error: comparison of distinct pointer types ('typeof ((rtt_avg)) *' (aka 'long long *') and 'uint64_t *' (aka 'unsigned long long *')) [-Werror,-Wcompare-distinct-pointer-types]
>         do_div(rtt_avg, 6666);
>         ^~~~~~~~~~~~~~~~~~~~~
> include/asm-generic/div64.h:222:28: note: expanded from macro 'do_div'
>         (void)(((typeof((n)) *)0) == ((uint64_t *)0));  \
>                ~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
> 1 error generated.
> 
> Change the do_div() to the simpler div_s64() that can handle
> negative inputs correctly.
> 
> Fixes: 937b10c0de68 ("iwlwifi: mvm: add debug prints for FTM")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Patch applied to wireless-drivers.git, thanks.

688cd8bd2c0f iwlwifi: fix 64-bit division

-- 
https://patchwork.kernel.org/patch/10838587/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches