linux-kernel - Re: [PATCH] power: supply: qcom_battmgr: remove bogus do

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Date:   Tue, 14 Feb 2023 23:02:10 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Arnd Bergmann <arnd@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: supply: qcom_battmgr: remove bogus do_div()

Hi,

On Tue, Feb 14, 2023 at 02:36:03PM +0100, Konrad Dybcio wrote:
> On 14.02.2023 14:20, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > The argument to do_div() is a 32-bit integer, and it was read from a
> > 32-bit register so there is no point in doing a 64-bit division on it.
> > 
> > On 32-bit arm, do_div() causes a compile-time warning here:
> > 
> > include/asm-generic/div64.h:238:22: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Werror=incompatible-pointer-types]
> >   238 |   __rem = __div64_32(&(n), __base); \
> >       |                      ^~~~
> >       |                      |
> >       |                      unsigned int *
> > drivers/power/supply/qcom_battmgr.c:1130:4: note: in expansion of macro 'do_div'
> >  1130 |    do_div(battmgr->status.percent, 100);
> > 
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Needs to go through the Qualcomm tree:

Acked-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

> >  drivers/power/supply/qcom_battmgr.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
> > index ec31f887184f..de77df97b3a4 100644
> > --- a/drivers/power/supply/qcom_battmgr.c
> > +++ b/drivers/power/supply/qcom_battmgr.c
> > @@ -1126,8 +1126,7 @@ static void qcom_battmgr_sm8350_callback(struct qcom_battmgr *battmgr,
> >  			battmgr->info.charge_type = le32_to_cpu(resp->intval.value);
> >  			break;
> >  		case BATT_CAPACITY:
> > -			battmgr->status.percent = le32_to_cpu(resp->intval.value);
> > -			do_div(battmgr->status.percent, 100);
> > +			battmgr->status.percent = le32_to_cpu(resp->intval.value) / 100;
> >  			break;
> >  		case BATT_VOLT_OCV:
> >  			battmgr->status.voltage_ocv = le32_to_cpu(resp->intval.value);

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