[alibaba-cloud:linux-next 11098/11168] kernel/cgroup/cpuset.c:1695:16: warning: stack frame size of 3280 bytes in function 'cpuset_write_resmask'

[alibaba-cloud:linux-next 11098/11168] kernel/cgroup/cpuset.c:1695:16: warning: stack frame size of 3280 bytes in function 'cpuset_write_resmask'

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 8050 bytes --]

tree:   https://github.com/alibaba/cloud-kernel.git linux-next
head:   1d6103ae4cce545c231de9498d0e70564e7b734e
commit: 61e5885959be9af0b6942ec2a3ea0e7ccc48bf05 [11098/11168] alinux: sched: Introduce per-cgroup idle accounting
config: x86_64-randconfig-a003-20200526 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 61e5885959be9af0b6942ec2a3ea0e7ccc48bf05
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> kernel/cgroup/cpuset.c:1695:16: warning: stack frame size of 3280 bytes in function 'cpuset_write_resmask' [-Wframe-larger-than=]
static ssize_t cpuset_write_resmask(struct kernfs_open_file *of,
^
1 warning generated.
kernel/cgroup/cpuset.c:2313: warning: Function parameter or member 'work' not described in 'cpuset_hotplug_workfn'
kernel/cgroup/cpuset.c:2643: warning: Function parameter or member 'rotor' not described in 'cpuset_spread_node'

vim +/cpuset_write_resmask +1695 kernel/cgroup/cpuset.c

5be7a4792a31df6 kernel/cpuset.c Paul Menage 2008-05-06  1691  
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1692  /*
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1693   * Common handling for a write to a "cpus" or "mems" file.
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1694   */
451af504df0c62f kernel/cpuset.c Tejun Heo   2014-05-13 @1695  static ssize_t cpuset_write_resmask(struct kernfs_open_file *of,
451af504df0c62f kernel/cpuset.c Tejun Heo   2014-05-13  1696  				    char *buf, size_t nbytes, loff_t off)
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1697  {
451af504df0c62f kernel/cpuset.c Tejun Heo   2014-05-13  1698  	struct cpuset *cs = css_cs(of_css(of));
645fcc9d2f6946f kernel/cpuset.c Li Zefan    2009-01-07  1699  	struct cpuset *trialcs;
5d21cc2db040d01 kernel/cpuset.c Tejun Heo   2013-01-07  1700  	int retval = -ENODEV;
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1701  
451af504df0c62f kernel/cpuset.c Tejun Heo   2014-05-13  1702  	buf = strstrip(buf);
451af504df0c62f kernel/cpuset.c Tejun Heo   2014-05-13  1703  
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1704  	/*
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1705  	 * CPU or memory hotunplug may leave @cs w/o any execution
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1706  	 * resources, in which case the hotplug code asynchronously updates
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1707  	 * configuration and transfers all tasks to the nearest ancestor
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1708  	 * which can execute.
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1709  	 *
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1710  	 * As writes to "cpus" or "mems" may restore @cs's execution
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1711  	 * resources, wait for the previously scheduled operations before
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1712  	 * proceeding, so that we don't end up keep removing tasks added
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1713  	 * after execution capability is restored.
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1714  	 *
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1715  	 * cpuset_hotplug_work calls back into cgroup core via
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1716  	 * cgroup_transfer_tasks() and waiting for it from a cgroupfs
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1717  	 * operation like this one can lead to a deadlock through kernfs
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1718  	 * active_ref protection.  Let's break the protection.  Losing the
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1719  	 * protection is okay as we check whether @cs is online after
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1720  	 * grabbing cpuset_mutex anyway.  This only happens on the legacy
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1721  	 * hierarchies.
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1722  	 */
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1723  	css_get(&cs->css);
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1724  	kernfs_break_active_protection(of->kn);
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1725  	flush_work(&cpuset_hotplug_work);
3a5a6d0c2b0391e kernel/cpuset.c Tejun Heo   2013-01-07  1726  
5d21cc2db040d01 kernel/cpuset.c Tejun Heo   2013-01-07  1727  	mutex_lock(&cpuset_mutex);
5d21cc2db040d01 kernel/cpuset.c Tejun Heo   2013-01-07  1728  	if (!is_cpuset_online(cs))
5d21cc2db040d01 kernel/cpuset.c Tejun Heo   2013-01-07  1729  		goto out_unlock;
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1730  
645fcc9d2f6946f kernel/cpuset.c Li Zefan    2009-01-07  1731  	trialcs = alloc_trial_cpuset(cs);
b75f38d659e6fc7 kernel/cpuset.c Li Zefan    2011-03-04  1732  	if (!trialcs) {
b75f38d659e6fc7 kernel/cpuset.c Li Zefan    2011-03-04  1733  		retval = -ENOMEM;
5d21cc2db040d01 kernel/cpuset.c Tejun Heo   2013-01-07  1734  		goto out_unlock;
b75f38d659e6fc7 kernel/cpuset.c Li Zefan    2011-03-04  1735  	}
645fcc9d2f6946f kernel/cpuset.c Li Zefan    2009-01-07  1736  
451af504df0c62f kernel/cpuset.c Tejun Heo   2014-05-13  1737  	switch (of_cft(of)->private) {
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1738  	case FILE_CPULIST:
645fcc9d2f6946f kernel/cpuset.c Li Zefan    2009-01-07  1739  		retval = update_cpumask(cs, trialcs, buf);
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1740  		break;
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1741  	case FILE_MEMLIST:
645fcc9d2f6946f kernel/cpuset.c Li Zefan    2009-01-07  1742  		retval = update_nodemask(cs, trialcs, buf);
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1743  		break;
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1744  	default:
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1745  		retval = -EINVAL;
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1746  		break;
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1747  	}
645fcc9d2f6946f kernel/cpuset.c Li Zefan    2009-01-07  1748  
645fcc9d2f6946f kernel/cpuset.c Li Zefan    2009-01-07  1749  	free_trial_cpuset(trialcs);
5d21cc2db040d01 kernel/cpuset.c Tejun Heo   2013-01-07  1750  out_unlock:
5d21cc2db040d01 kernel/cpuset.c Tejun Heo   2013-01-07  1751  	mutex_unlock(&cpuset_mutex);
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1752  	kernfs_unbreak_active_protection(of->kn);
76bb5ab8f6e3e7b kernel/cpuset.c Tejun Heo   2014-06-30  1753  	css_put(&cs->css);
e93ad19d0564839 kernel/cpuset.c Tejun Heo   2016-01-19  1754  	flush_workqueue(cpuset_migrate_mm_wq);
451af504df0c62f kernel/cpuset.c Tejun Heo   2014-05-13  1755  	return retval ?: nbytes;
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1756  }
e37123953292146 kernel/cpuset.c Paul Menage 2008-07-25  1757  

:::::: The code at line 1695 was first introduced by commit
:::::: 451af504df0c62f695a69b83c250486e77c66378 cgroup: replace cftype->write_string() with cftype->write()

:::::: TO: Tejun Heo <tj@kernel.org>
:::::: CC: Tejun Heo <tj@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

[-- Attachment #2: config.gz --]
[-- Type: application/gzip, Size: 32786 bytes --]