linux-kernel - Re: [PATCH] soc: qcom: stats: Fix division issue on 32-bit platforms

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Message-ID: <22785d9a-0d4f-4ebd-bc98-3e77dcb4db13@infradead.org>
Date:   Tue, 5 Dec 2023 17:52:24 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: qcom: stats: Fix division issue on 32-bit platforms



On 12/5/23 16:44, Bjorn Andersson wrote:
> commit 'e84e61bdb97c ("soc: qcom: stats: Add DDR sleep stats")' made it
> in with a mult_frac() which causes link errors on Arm and PowerPC
> builds:
> 
>   ERROR: modpost: "__aeabi_uldivmod" [drivers/soc/qcom/qcom_stats.ko] undefined!
> 
> Expand the mult_frac() to avoid this problem.
> 
> Fixes: e84e61bdb97c ("soc: qcom: stats: Add DDR sleep stats")
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>

That works. Thanks.

Acked-by: Randy Dunlap <rdunlap@...radead.org>
Tested-by: Randy Dunlap <rdunlap@...radead.org> # build-tested



> ---
>  drivers/soc/qcom/qcom_stats.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/qcom/qcom_stats.c b/drivers/soc/qcom/qcom_stats.c
> index 4763d62a8cb0..5ba61232313e 100644
> --- a/drivers/soc/qcom/qcom_stats.c
> +++ b/drivers/soc/qcom/qcom_stats.c
> @@ -221,7 +221,8 @@ static int qcom_ddr_stats_show(struct seq_file *s, void *unused)
>  
>  	for (i = 0; i < ddr.entry_count; i++) {
>  		/* Convert the period to ms */
> -		entry[i].dur = mult_frac(MSEC_PER_SEC, entry[i].dur, ARCH_TIMER_FREQ);
> +		entry[i].dur *= MSEC_PER_SEC;
> +		entry[i].dur = div_u64(entry[i].dur, ARCH_TIMER_FREQ);
>  	}
>  
>  	for (i = 0; i < ddr.entry_count; i++)
> 
> ---
> base-commit: adcad44bd1c73a5264bff525e334e2f6fc01bb9b
> change-id: 20231205-qcom_stats-aeabi_uldivmod-fix-4a63c7ec013f
> 
> Best regards,

-- 
~Randy