linux-kernel - Re: [PATCH -next 2/2] PM: suspend: advanced pm_wakeup

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Date:   Wed, 29 Jun 2022 19:58:49 +0800
From:   kernel test robot <lkp@...el.com>
To:     xiongxin <xiongxin@...inos.cn>, rafael@...nel.org,
        len.brown@...el.com, pavel@....cz
Cc:     kbuild-all@...ts.01.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, xiongxin@...inos.cn
Subject: Re: [PATCH -next 2/2] PM: suspend: advanced pm_wakeup_clear() for
 normal suspend/hibernate

Hi xiongxin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20220628]

url:    https://github.com/intel-lab-lkp/linux/commits/xiongxin/PM-suspend-Optimized-suspend-is-fail-returned-by-wakeup/20220629-114731
base:    cb71b93c2dc36d18a8b05245973328d018272cdf
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220629/202206291941.94EV5b6M-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 11.3.0
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
        # https://github.com/intel-lab-lkp/linux/commit/2e0bc447b95996d1757038708bd6adf613f0b936
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review xiongxin/PM-suspend-Optimized-suspend-is-fail-returned-by-wakeup/20220629-114731
        git checkout 2e0bc447b95996d1757038708bd6adf613f0b936
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   kernel/power/process.c: In function 'freeze_processes':
>> kernel/power/process.c:134:13: error: 'pm_suspend_target_state' undeclared (first use in this function)
     134 |         if (pm_suspend_target_state != PM_SUSPEND_ON)
         |             ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/power/process.c:134:13: note: each undeclared identifier is reported only once for each function it appears in


vim +/pm_suspend_target_state +134 kernel/power/process.c

   112	
   113	/**
   114	 * freeze_processes - Signal user space processes to enter the refrigerator.
   115	 * The current thread will not be frozen.  The same process that calls
   116	 * freeze_processes must later call thaw_processes.
   117	 *
   118	 * On success, returns 0.  On failure, -errno and system is fully thawed.
   119	 */
   120	int freeze_processes(void)
   121	{
   122		int error;
   123	
   124		error = __usermodehelper_disable(UMH_FREEZING);
   125		if (error)
   126			return error;
   127	
   128		/* Make sure this task doesn't get frozen */
   129		current->flags |= PF_SUSPEND_TASK;
   130	
   131		if (!pm_freezing)
   132			atomic_inc(&system_freezing_cnt);
   133	
 > 134		if (pm_suspend_target_state != PM_SUSPEND_ON)
   135			pm_wakeup_clear(1);
   136		else
   137			pm_wakeup_clear(0);
   138		pr_info("Freezing user space processes ... ");
   139		pm_freezing = true;
   140		error = try_to_freeze_tasks(true);
   141		if (!error) {
   142			__usermodehelper_set_disable_depth(UMH_DISABLED);
   143			pr_cont("done.");
   144		}
   145		pr_cont("\n");
   146		BUG_ON(in_atomic());
   147	
   148		/*
   149		 * Now that the whole userspace is frozen we need to disable
   150		 * the OOM killer to disallow any further interference with
   151		 * killable tasks. There is no guarantee oom victims will
   152		 * ever reach a point they go away we have to wait with a timeout.
   153		 */
   154		if (!error && !oom_killer_disable(msecs_to_jiffies(freeze_timeout_msecs)))
   155			error = -EBUSY;
   156	
   157		if (error)
   158			thaw_processes();
   159		return error;
   160	}
   161	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp