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    Subject[PATCH 5.16 0679/1039] PM: AVS: qcom-cpr: Use div64_ul instead of do_div
    Date
    From: Changcheng Deng <deng.changcheng@zte.com.cn>

    [ Upstream commit 92c550f9ffd2884bb5def52b5c0485a35e452784 ]

    do_div() does a 64-by-32 division. Here the divisor is an unsigned long
    which on some platforms is 64 bit wide. So use div64_ul instead of do_div
    to avoid a possible truncation.

    Reported-by: Zeal Robot <zealci@zte.com.cn>
    Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn>
    Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
    Link: https://lore.kernel.org/r/20211125014311.45942-1-deng.changcheng@zte.com.cn
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/soc/qcom/cpr.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/soc/qcom/cpr.c b/drivers/soc/qcom/cpr.c
    index 1d818a8ba2089..e9b854ed1bdfd 100644
    --- a/drivers/soc/qcom/cpr.c
    +++ b/drivers/soc/qcom/cpr.c
    @@ -1010,7 +1010,7 @@ static int cpr_interpolate(const struct corner *corner, int step_volt,
    return corner->uV;

    temp = f_diff * (uV_high - uV_low);
    - do_div(temp, f_high - f_low);
    + temp = div64_ul(temp, f_high - f_low);

    /*
    * max_volt_scale has units of uV/MHz while freq values
    --
    2.34.1


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