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Message-ID: <2fb1658a-3a38-7eb4-0e6e-d8c61981bdab@quicinc.com>
Date:   Thu, 4 May 2023 20:13:34 +0530
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Subject: Re: [PATCH v3 07/18] arm64: defconfig: Enable Qualcomm minidump
 driver
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To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        <agross@kernel.org>, <andersson@kernel.org>,
        <konrad.dybcio@linaro.org>, <corbet@lwn.net>,
        <keescook@chromium.org>, <tony.luck@intel.com>,
        <gpiccoli@igalia.com>, <catalin.marinas@arm.com>,
        <will@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>,
        <robh+dt@kernel.org>, <linus.walleij@linaro.org>,
        <linux-gpio@vger.kernel.org>, <srinivas.kandagatla@linaro.org>
CC:     <linux-arm-msm@vger.kernel.org>,
        <linux-remoteproc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-hardening@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <linux-doc@vger.kernel.org>
References: <1683133352-10046-1-git-send-email-quic_mojha@quicinc.com>
 <1683133352-10046-8-git-send-email-quic_mojha@quicinc.com>
 <ad9915b2-56ff-3f95-7c92-fae597d6ed43@linaro.org>
 <4325c2e7-8ca1-7e45-db14-5ba8bc83f5d7@quicinc.com>
 <a4118697-d575-6499-ed8e-656e51ca0da3@linaro.org>
From:   Mukesh Ojha <quic_mojha@quicinc.com>
In-Reply-To: <a4118697-d575-6499-ed8e-656e51ca0da3@linaro.org>
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On 5/4/2023 6:02 PM, Krzysztof Kozlowski wrote:
> On 04/05/2023 13:45, Mukesh Ojha wrote:
>>
>>
>> On 5/4/2023 4:53 PM, Krzysztof Kozlowski wrote:
>>> On 03/05/2023 19:02, Mukesh Ojha wrote:
>>>> Previous patches add the Qualcomm minidump driver support, so
>>>> lets enable minidump config so that it can be used by kernel
>>>> clients.
>>>>
>>>> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
>>>
>>> This patchset is split too much. Defconfig change is one change. Not two
>>> or three.
>>>
>>>> ---
>>>>    arch/arm64/configs/defconfig | 1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
>>>> index a24609e..831c942 100644
>>>> --- a/arch/arm64/configs/defconfig
>>>> +++ b/arch/arm64/configs/defconfig
>>>> @@ -1250,6 +1250,7 @@ CONFIG_QCOM_STATS=m
>>>>    CONFIG_QCOM_WCNSS_CTRL=m
>>>>    CONFIG_QCOM_APR=m
>>>>    CONFIG_QCOM_ICC_BWMON=m
>>>> +CONFIG_QCOM_MINIDUMP=y
>>>
>>> This must be a module.
>>
>> Why do you think this should be a module ?
>>
>> Is it because, it is lying here among others '=m' ?
> 
> Because we want and insist on everything being a module. That's the
> generic rule. There are exceptions, so if this justifies being an
> exception, please bring appropriate arguments.
> 
>>
>> Or you have some other reasoning ? like it is for qcom specific
>> soc and can not be used outside ? but that is not true for
>> all configs mentioned here.
>>
>> The reason behind making it as '=y' was, to collect information from
>> core kernel data structure as well as the information like percpu data,
>> run queue, irq stat kind of information on kernel crash on a target
>> running some perf configuration(android phone).
> 
> I don't understand why =m stops you from all that.

How do i get kernel symbol address from a modules
can we use kallsyms_lookup_name from modules ?

--Mukesh

  What's more, I don't
> understand why do you refer to the Android here. This is a development
> and debugging Linux defconfig, not Android reference config for vendors...
> 
> Best regards,
> Krzysztof
>