Re: [PATCH] power: supply: qcom_battmgr: remove bogus do_div()

From: Sebastian Reichel
Date: Tue Feb 14 2023 - 17:03:08 EST


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@xxxxxxxx>
> >
> > 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@xxxxxxxx>
> > ---
> Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>

Needs to go through the Qualcomm tree:

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

-- 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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