linux-kernel - Re: [PATCH 1/3] SCHEDULER: Add an interface for counting real utilization.

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Date:   Thu, 28 Sep 2023 15:52:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Xiaobing Li <xiaobing.li@...sung.com>, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        axboe@...nel.dk, asml.silence@...il.com
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        kun.dou@...sung.com, peiwei.li@...sung.com, joshi.k@...sung.com,
        kundan.kumar@...sung.com, wenwen.chen@...sung.com,
        ruyi.zhang@...sung.com, Xiaobing Li <xiaobing.li@...sung.com>
Subject: Re: [PATCH 1/3] SCHEDULER: Add an interface for counting real
 utilization.

Hi Xiaobing,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on linus/master v6.6-rc3 next-20230928]
[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/Xiaobing-Li/SCHEDULER-Add-an-interface-for-counting-real-utilization/20230928-103219
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20230928022228.15770-2-xiaobing.li%40samsung.com
patch subject: [PATCH 1/3] SCHEDULER: Add an interface for counting real utilization.
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230928/202309281554.CwGBQGhe-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230928/202309281554.CwGBQGhe-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/202309281554.CwGBQGhe-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:52:
>> kernel/sched/cputime.c:482:6: warning: no previous prototype for 'get_sqthread_util' [-Wmissing-prototypes]
     482 | void get_sqthread_util(struct task_struct *p)
         |      ^~~~~~~~~~~~~~~~~
   kernel/sched/cputime.c: In function 'get_sqthread_util':
   kernel/sched/cputime.c:484:56: error: 'struct kernel_cpustat' has no member named 'sq_util'
     484 |         struct task_struct **sqstat = kcpustat_this_cpu->sq_util;
         |                                                        ^~
   kernel/sched/cputime.c:486:29: error: 'MAX_SQ_NUM' undeclared (first use in this function)
     486 |         for (int i = 0; i < MAX_SQ_NUM; i++) {
         |                             ^~~~~~~~~~
   kernel/sched/cputime.c:486:29: note: each undeclared identifier is reported only once for each function it appears in
   kernel/sched/cputime.c:495:31: error: 'struct kernel_cpustat' has no member named 'flag'
     495 |         if (!kcpustat_this_cpu->flag) {
         |                               ^~
   kernel/sched/cputime.c:497:42: error: 'struct kernel_cpustat' has no member named 'sq_util'
     497 |                         kcpustat_this_cpu->sq_util[j] = NULL;
         |                                          ^~
   kernel/sched/cputime.c:498:34: error: 'struct kernel_cpustat' has no member named 'flag'
     498 |                 kcpustat_this_cpu->flag = true;
         |                                  ^~


vim +/get_sqthread_util +482 kernel/sched/cputime.c

   481	
 > 482	void get_sqthread_util(struct task_struct *p)
   483	{
   484		struct task_struct **sqstat = kcpustat_this_cpu->sq_util;
   485	
   486		for (int i = 0; i < MAX_SQ_NUM; i++) {
   487			if (sqstat[i] && (task_cpu(sqstat[i]) != task_cpu(p)
   488			|| sqstat[i]->__state == TASK_DEAD))
   489				sqstat[i] = NULL;
   490		}
   491	
   492		if (strncmp(p->comm, "iou-sqp", 7))
   493			return;
   494	
   495		if (!kcpustat_this_cpu->flag) {
   496			for (int j = 0; j < MAX_SQ_NUM; j++)
   497				kcpustat_this_cpu->sq_util[j] = NULL;
   498			kcpustat_this_cpu->flag = true;
   499		}
   500		int index = MAX_SQ_NUM;
   501		bool flag = true;
   502	
   503		for (int i = 0; i < MAX_SQ_NUM; i++) {
   504			if (sqstat[i] == p)
   505				flag = false;
   506			if (!sqstat[i] || task_cpu(sqstat[i]) != task_cpu(p)) {
   507				sqstat[i] = NULL;
   508				if (i < index)
   509					index = i;
   510			}
   511		}
   512		if (flag && index < MAX_SQ_NUM)
   513			sqstat[index] = p;
   514	}
   515	

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