linux-kernel - Re: [PATCH V0 2/2] iio: adc: sprd_pmic_adc: Add support for UMP serise pmic adc

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Message-ID: <20230828153821.51705a00@jic23-huawei>
Date:   Mon, 28 Aug 2023 15:38:21 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Mingjin Yang <mingjin.yang@...soc.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        oe-kbuild-all@...ts.linux.dev, magicyangmingjin@...il.com,
        Ling_Ling.Xu@...soc.com, Jinfeng.Lin1@...soc.com,
        Yangbin.Li@...soc.com, Jiansheng.Wu@...soc.com,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V0 2/2] iio: adc: sprd_pmic_adc: Add support for UMP
 serise pmic adc

On Wed, 16 Aug 2023 22:07:15 +0800
kernel test robot <lkp@...el.com> wrote:

> Hi Mingjin,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on robh/for-next]
> [also build test WARNING on linus/master v6.5-rc6 next-20230816]
> [cannot apply to jic23-iio/togreg]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Mingjin-Yang/dt-bindings-iio-adc-Add-support-for-ump518-pmic-adc/20230816-160754
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
> patch link:    https://lore.kernel.org/r/20230816080225.21482-3-mingjin.yang%40unisoc.com
> patch subject: [PATCH V0 2/2] iio: adc: sprd_pmic_adc: Add support for UMP serise pmic adc
> config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20230816/202308162143.UjXhwiRf-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 12.3.0
> reproduce: (https://download.01.org/0day-ci/archive/20230816/202308162143.UjXhwiRf-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202308162143.UjXhwiRf-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    drivers/iio/adc/sprd_pmic_adc.c: In function 'ump9620_ch_data_init':
> >> drivers/iio/adc/sprd_pmic_adc.c:530:1: warning: the frame size of 1320 bytes is larger than 1024 bytes [-Wframe-larger-than=]  
>      530 | }
>          | ^
> 
> 
> vim +530 drivers/iio/adc/sprd_pmic_adc.c
> 
>    506	
>    507	static void ump9620_ch_data_init(struct sprd_adc_data *data)
>    508	{
>    509		struct sprd_adc_channel_data ch_data_def = CH_DATA_INIT(SCALE_00, 0, 0, RATIO_DEF);
>    510		struct sprd_adc_channel_data ch_data[SPRD_ADC_CHANNEL_MAX] = {

Make these both const and I think the compiler will move these off the stack thus
solving the issue seen.

>    511			[0] = CH_DATA_INIT(SCALE_01, 0, 0, RATIO_DEF),
>    512			[5] = CH_DATA_INIT(SCALE_00, 0x1, 0x9, RATIO_DEF),
>    513			[6] = CH_DATA_INIT(SCALE_00, 0x1, 0x9, RATIO_DEF),
>    514			[7] = CH_DATA_INIT(SCALE_10, 0, 0, RATIO_DEF),
>    515			[9] = CH_DATA_INIT(SCALE_10, 0, 0, RATIO_DEF),
>    516			[10] = CH_DATA_INIT(SCALE_11, 0, 0, RATIO_DEF),
>    517			[11] = CH_DATA_INIT(SCALE_00, 0, 0, RATIO_DEF),
>    518			[13] = CH_DATA_INIT(SCALE_01, 0, 0, RATIO_DEF),
>    519			[14] = CH_DATA_INIT(SCALE_00, 0, 0, RATIO(68, 900)),
>    520			[15] = CH_DATA_INIT(SCALE_00, 0, 0, RATIO(1, 3)),
>    521			[19] = CH_DATA_INIT(SCALE_11, 0, 0, RATIO_DEF),
>    522			[21] = CH_DATA_INIT(SCALE_00, 0, 0, RATIO(3, 8)),
>    523			[22] = CH_DATA_INIT(SCALE_00, 0, 0, RATIO(3, 8)),
>    524			[23] = CH_DATA_INIT(SCALE_00, 0, 0, RATIO(3, 8)),
>    525			[30] = CH_DATA_INIT(SCALE_11, 0, 0, RATIO_DEF),
>    526			[31] = CH_DATA_INIT(SCALE_11, 0, 0, RATIO_DEF),
>    527		};
>    528	
>    529		sprd_adc_ch_data_merge(data, ch_data, &ch_data_def);

>  > 530	}  
>    531	
>