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Date:   Sun, 18 Sep 2022 12:32:40 +0800
From:   kernel test robot <lkp@intel.com>
To:     Jingyu Wang <jingyuwang_vip@163.com>, sudeep.holla@arm.com,
        cristian.marussi@arm.com, linux-arm-kernel@lists.infradead.org
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org, Jingyu Wang <jingyuwang_vip@163.com>
Subject: Re: [PATCH] firmware: arm_scmi: remove unnecessary 'NULL' values
 from pointer
Message-ID: <202209181214.kSFKDUG9-lkp@intel.com>
References: <20220918021410.17369-1-jingyuwang_vip@163.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20220918021410.17369-1-jingyuwang_vip@163.com>
Precedence: bulk

Hi Jingyu,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on d5538ab91d3a9a237805be6f8c6c272af2987995]

url:    https://github.com/intel-lab-lkp/linux/commits/Jingyu-Wang/firmware-arm_scmi-remove-unnecessary-NULL-values-from-pointer/20220918-101734
base:   d5538ab91d3a9a237805be6f8c6c272af2987995
config: riscv-randconfig-r042-20220918 (https://download.01.org/0day-ci/archive/20220918/202209181214.kSFKDUG9-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/7fd368bb28e43ed330ef1e678986e3ef1fbc4295
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jingyu-Wang/firmware-arm_scmi-remove-unnecessary-NULL-values-from-pointer/20220918-101734
        git checkout 7fd368bb28e43ed330ef1e678986e3ef1fbc4295
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/firmware/arm_scmi/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/firmware/arm_scmi/perf.c:762:2: warning: variable 'rep' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized]
           default:
           ^~~~~~~
   drivers/firmware/arm_scmi/perf.c:766:9: note: uninitialized use occurs here
           return rep;
                  ^~~
>> drivers/firmware/arm_scmi/perf.c:751:7: warning: variable 'rep' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
                   if (sizeof(*p) != payld_sz)
                       ^~~~~~~~~~~~~~~~~~~~~~
   drivers/firmware/arm_scmi/perf.c:766:9: note: uninitialized use occurs here
           return rep;
                  ^~~
   drivers/firmware/arm_scmi/perf.c:751:3: note: remove the 'if' if its condition is always false
                   if (sizeof(*p) != payld_sz)
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/firmware/arm_scmi/perf.c:734:7: warning: variable 'rep' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
                   if (sizeof(*p) != payld_sz)
                       ^~~~~~~~~~~~~~~~~~~~~~
   drivers/firmware/arm_scmi/perf.c:766:9: note: uninitialized use occurs here
           return rep;
                  ^~~
   drivers/firmware/arm_scmi/perf.c:734:3: note: remove the 'if' if its condition is always false
                   if (sizeof(*p) != payld_sz)
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/firmware/arm_scmi/perf.c:726:11: note: initialize the variable 'rep' to silence this warning
           void *rep;
                    ^
                     = NULL
   3 warnings generated.


vim +/rep +762 drivers/firmware/arm_scmi/perf.c

fb5086dc474618 Cristian Marussi 2020-07-01  720  
3cb8c95f4b3055 Cristian Marussi 2021-03-16  721  static void *scmi_perf_fill_custom_report(const struct scmi_protocol_handle *ph,
72a5eb9d9c319c Cristian Marussi 2020-07-10  722  					  u8 evt_id, ktime_t timestamp,
fb5086dc474618 Cristian Marussi 2020-07-01  723  					  const void *payld, size_t payld_sz,
fb5086dc474618 Cristian Marussi 2020-07-01  724  					  void *report, u32 *src_id)
fb5086dc474618 Cristian Marussi 2020-07-01  725  {
7fd368bb28e43e Jingyu Wang      2022-09-18  726  	void *rep;
fb5086dc474618 Cristian Marussi 2020-07-01  727  
fb5086dc474618 Cristian Marussi 2020-07-01  728  	switch (evt_id) {
fb5086dc474618 Cristian Marussi 2020-07-01  729  	case SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED:
fb5086dc474618 Cristian Marussi 2020-07-01  730  	{
fb5086dc474618 Cristian Marussi 2020-07-01  731  		const struct scmi_perf_limits_notify_payld *p = payld;
fb5086dc474618 Cristian Marussi 2020-07-01  732  		struct scmi_perf_limits_report *r = report;
fb5086dc474618 Cristian Marussi 2020-07-01  733  
fb5086dc474618 Cristian Marussi 2020-07-01  734  		if (sizeof(*p) != payld_sz)
fb5086dc474618 Cristian Marussi 2020-07-01  735  			break;
fb5086dc474618 Cristian Marussi 2020-07-01  736  
fb5086dc474618 Cristian Marussi 2020-07-01  737  		r->timestamp = timestamp;
fb5086dc474618 Cristian Marussi 2020-07-01  738  		r->agent_id = le32_to_cpu(p->agent_id);
fb5086dc474618 Cristian Marussi 2020-07-01  739  		r->domain_id = le32_to_cpu(p->domain_id);
fb5086dc474618 Cristian Marussi 2020-07-01  740  		r->range_max = le32_to_cpu(p->range_max);
fb5086dc474618 Cristian Marussi 2020-07-01  741  		r->range_min = le32_to_cpu(p->range_min);
fb5086dc474618 Cristian Marussi 2020-07-01  742  		*src_id = r->domain_id;
fb5086dc474618 Cristian Marussi 2020-07-01  743  		rep = r;
fb5086dc474618 Cristian Marussi 2020-07-01  744  		break;
fb5086dc474618 Cristian Marussi 2020-07-01  745  	}
fb5086dc474618 Cristian Marussi 2020-07-01  746  	case SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED:
fb5086dc474618 Cristian Marussi 2020-07-01  747  	{
fb5086dc474618 Cristian Marussi 2020-07-01  748  		const struct scmi_perf_level_notify_payld *p = payld;
fb5086dc474618 Cristian Marussi 2020-07-01  749  		struct scmi_perf_level_report *r = report;
fb5086dc474618 Cristian Marussi 2020-07-01  750  
fb5086dc474618 Cristian Marussi 2020-07-01 @751  		if (sizeof(*p) != payld_sz)
fb5086dc474618 Cristian Marussi 2020-07-01  752  			break;
fb5086dc474618 Cristian Marussi 2020-07-01  753  
fb5086dc474618 Cristian Marussi 2020-07-01  754  		r->timestamp = timestamp;
fb5086dc474618 Cristian Marussi 2020-07-01  755  		r->agent_id = le32_to_cpu(p->agent_id);
fb5086dc474618 Cristian Marussi 2020-07-01  756  		r->domain_id = le32_to_cpu(p->domain_id);
fb5086dc474618 Cristian Marussi 2020-07-01  757  		r->performance_level = le32_to_cpu(p->performance_level);
fb5086dc474618 Cristian Marussi 2020-07-01  758  		*src_id = r->domain_id;
fb5086dc474618 Cristian Marussi 2020-07-01  759  		rep = r;
fb5086dc474618 Cristian Marussi 2020-07-01  760  		break;
fb5086dc474618 Cristian Marussi 2020-07-01  761  	}
fb5086dc474618 Cristian Marussi 2020-07-01 @762  	default:
fb5086dc474618 Cristian Marussi 2020-07-01  763  		break;
fb5086dc474618 Cristian Marussi 2020-07-01  764  	}
fb5086dc474618 Cristian Marussi 2020-07-01  765  
fb5086dc474618 Cristian Marussi 2020-07-01  766  	return rep;
fb5086dc474618 Cristian Marussi 2020-07-01  767  }
fb5086dc474618 Cristian Marussi 2020-07-01  768  

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