linux-kernel - Re: [PATCH V2] clk: qcom: clk-rcg2: Fix clock rate overflow for high parent frequencies

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Date:   Wed, 20 Sep 2023 10:14:08 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     agross@...nel.org, konrad.dybcio@...aro.org,
        mturquette@...libre.com, sboyd@...nel.org, mturquette@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Devi Priya <quic_devipriy@...cinc.com>
Cc:     quic_saahtoma@...cinc.com
Subject: Re: [PATCH V2] clk: qcom: clk-rcg2: Fix clock rate overflow for high parent frequencies


On Fri, 01 Sep 2023 13:06:40 +0530, Devi Priya wrote:
> If the parent clock rate is greater than unsigned long max/2 then
> integer overflow happens when calculating the clock rate on 32-bit systems.
> As RCG2 uses half integer dividers, the clock rate is first being
> multiplied by 2 which will overflow the unsigned long max value.
> Hence, replace the common pattern of doing 64-bit multiplication
> and then a do_div() call with simpler mult_frac call.
> 
> [...]

Applied, thanks!

[1/1] clk: qcom: clk-rcg2: Fix clock rate overflow for high parent frequencies
      commit: f7b7d30158cff246667273bd2a62fc93ee0725d2

Best regards,
-- 
Bjorn Andersson <andersson@...nel.org>