linux-kernel - Re: [PATCH] arm64: dts: qcom: msm8992-lg-bullhead: Correct memory overlap with SMEM region

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Message-ID: <fd879d4e-13d7-bb82-8668-a1423fc7e428@linaro.org>
Date:   Mon, 30 Jan 2023 15:21:16 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Petr Vorel <petr.vorel@...il.com>,
        Jamie Douglass <jamiemdouglass@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Dominik Kobinski <dominikkobinski314@...il.com>,
        Konrad Dybico <konrad.dybico@...aro.org>
Subject: Re: [PATCH] arm64: dts: qcom: msm8992-lg-bullhead: Correct memory
 overlap with SMEM region



On 30.01.2023 15:19, Petr Vorel wrote:
> Hi Jamie,
> 
> On Sat, 28 Jan 2023 at 06:53, Jamie Douglass <jamiemdouglass@...il.com> wrote:
>>
>> A previously committed reserved memory region was overlapping with the
> 
> IMHO there should be marked commit which you're fixing:
> Fixes: 22c7e1a0fa45 ("arm64: dts: msm8992-bullhead: add memory hole region")
Yes

> 
>> SMEM memory region, causing an error message in dmesg:
>>         OF: reserved mem: OVERLAP DETECTED!
>>         reserved@...0000 (0x0000000005000000--0x0000000007200000)
>>         overlaps with smem_region@...0000
>>         (0x0000000006a00000--0x0000000006c00000)
>> This patch splits the previous reserved memory region into two
>> reserved sections either side of the SMEM memory region.
> 
> Reviewed-by: Petr Vorel <pvorel@...e.cz>
> Tested-by: Petr Vorel <pvorel@...e.cz>
> ...
>> +++ b/arch/arm64/boot/dts/qcom/msm8992-lg-bullhead.dtsi
>> @@ -53,8 +53,13 @@ cont_splash_mem: memory@...0000 {
>>                         no-map;
>>                 };
>>
>> -               removed_region: reserved@...0000 {
>> -                       reg = <0 0x05000000 0 0x2200000>;
>> +               reserved@...0000 {
> Can we keep "removed_region:" ?
> removed_region: reserved@...0000 {
> 
>> +                       reg = <0x0 0x05000000 0x0 0x1a00000>;
>> +                       no-map;
>> +               };
>> +
>> +               reserved@...0000 {
> Not sure which label to add, maybe append 2?
> removed_region2: reserved@...0000 {
> @Konrad @Krzysztof WDYT?
Generally, if you don't expect that there'll be a need to
amend/reference the node from somewhere else, the label is
rather useless..

Konrad

> 
> Kind regards,
> Petr
> 
>> +                       reg = <0x0 0x06c00000 0x0 0x400000>;
>>                         no-map;
>>                 };
>>         };