linux-kernel - Re: [PATCH] profile: Remove unnecessary ‘0’ values from err

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Message-ID: <767e9a6f-5470-491e-a08a-e5a8ee48b1cb@kadam.mountain>
Date:   Thu, 12 Oct 2023 09:27:41 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     oe-kbuild@...ts.linux.dev, Li zeming <zeming@...china.com>,
        linux-kernel@...r.kernel.org
Cc:     lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        Li zeming <zeming@...china.com>
Subject: Re: [PATCH] profile: Remove unnecessary ‘0’ values from err

Hi Li,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Li-zeming/profile-Remove-unnecessary-0-values-from-err/20230919-094202
base:   linus/master
patch link:    https://lore.kernel.org/r/20230919014126.8168-1-zeming%40nfschina.com
patch subject: [PATCH] profile: Remove unnecessary ‘0’ values from err
config: i386-randconfig-141-20230921 (https://download.01.org/0day-ci/archive/20231012/202310120931.henXte1M-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce: (https://download.01.org/0day-ci/archive/20231012/202310120931.henXte1M-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>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202310120931.henXte1M-lkp@intel.com/

smatch warnings:
kernel/profile.c:491 create_proc_profile() error: uninitialized symbol 'err'.

vim +/err +491 kernel/profile.c

^1da177e4c3f41 Linus Torvalds            2005-04-16  467  
1997ab2b2a8d46 Li zeming                 2023-09-19  468  	int err;
^1da177e4c3f41 Linus Torvalds            2005-04-16  469  
^1da177e4c3f41 Linus Torvalds            2005-04-16  470  	if (!prof_on)
^1da177e4c3f41 Linus Torvalds            2005-04-16  471  		return 0;
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  472  #ifdef CONFIG_SMP
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  473  	err = cpuhp_setup_state(CPUHP_PROFILE_PREPARE, "PROFILE_PREPARE",
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  474  				profile_prepare_cpu, profile_dead_cpu);
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  475  	if (err)
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  476  		return err;
c270a817196a93 Srivatsa S. Bhat          2014-03-11  477  
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  478  	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "AP_PROFILE_ONLINE",
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  479  				profile_online_cpu, NULL);
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  480  	if (err < 0)
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  481  		goto err_state_prep;
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  482  	online_state = err;
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  483  	err = 0;
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  484  #endif

err is uninitialized on single processor systems.

c33fff0afbef4f Denis V. Lunev            2008-04-29  485  	entry = proc_create("profile", S_IWUSR | S_IRUGO,
97a32539b9568b Alexey Dobriyan           2020-02-03  486  			    NULL, &profile_proc_ops);
1ad82fd547c716 Paolo Ciarrocchi          2008-01-25  487  	if (!entry)
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13  488  		goto err_state_onl;
271a15eabe0945 David Howells             2013-04-12  489  	proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t));
c270a817196a93 Srivatsa S. Bhat          2014-03-11  490  
e722d8daafb974 Sebastian Andrzej Siewior 2016-07-13 @491  	return err;

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki