linux-kernel - [gustavoars:testing/wfamnae-next20241114 1/22] kernel/sched/ext.c:3765:10: error: incompatible pointer types returning 'struct cgroup_hdr *' from a function with result type 'struct cgroup *'

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Message-ID: <202411180931.Jr9Zovhz-lkp@intel.com>
Date: Mon, 18 Nov 2024 09:22:16 +0800
From: kernel test robot <lkp@...el.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [gustavoars:testing/wfamnae-next20241114 1/22]
 kernel/sched/ext.c:3765:10: error: incompatible pointer types returning
 'struct cgroup_hdr *' from a function with result type 'struct cgroup *'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20241114
head:   ffa0ea7cd2216fa4db0e24844e1675e94b7db1aa
commit: 0fd0709da703a3bd95ed738a114858aa57e3d712 [1/22] cgroup: Avoid -Wflex-array-member-not-at-end warnings
config: powerpc64-randconfig-001-20241118 (https://download.01.org/0day-ci/archive/20241118/202411180931.Jr9Zovhz-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241118/202411180931.Jr9Zovhz-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/202411180931.Jr9Zovhz-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:63:
>> kernel/sched/ext.c:3765:10: error: incompatible pointer types returning 'struct cgroup_hdr *' from a function with result type 'struct cgroup *' [-Werror,-Wincompatible-pointer-types]
                   return &cgrp_dfl_root.cgrp;
                          ^~~~~~~~~~~~~~~~~~~
>> kernel/sched/ext.c:7533:17: error: incompatible pointer types initializing 'struct cgroup *' with an expression of type 'struct cgroup_hdr *' [-Werror,-Wincompatible-pointer-types]
           struct cgroup *cgrp = &cgrp_dfl_root.cgrp;
                          ^      ~~~~~~~~~~~~~~~~~~~
   2 errors generated.


vim +3765 kernel/sched/ext.c

f0e1a0643a59bf Tejun Heo 2024-06-18  3753  
8195136669661f Tejun Heo 2024-09-04  3754  #ifdef CONFIG_EXT_GROUP_SCHED
8195136669661f Tejun Heo 2024-09-04  3755  static struct cgroup *tg_cgrp(struct task_group *tg)
8195136669661f Tejun Heo 2024-09-04  3756  {
8195136669661f Tejun Heo 2024-09-04  3757  	/*
8195136669661f Tejun Heo 2024-09-04  3758  	 * If CGROUP_SCHED is disabled, @tg is NULL. If @tg is an autogroup,
8195136669661f Tejun Heo 2024-09-04  3759  	 * @tg->css.cgroup is NULL. In both cases, @tg can be treated as the
8195136669661f Tejun Heo 2024-09-04  3760  	 * root cgroup.
8195136669661f Tejun Heo 2024-09-04  3761  	 */
8195136669661f Tejun Heo 2024-09-04  3762  	if (tg && tg->css.cgroup)
8195136669661f Tejun Heo 2024-09-04  3763  		return tg->css.cgroup;
8195136669661f Tejun Heo 2024-09-04  3764  	else
8195136669661f Tejun Heo 2024-09-04 @3765  		return &cgrp_dfl_root.cgrp;
8195136669661f Tejun Heo 2024-09-04  3766  }
8195136669661f Tejun Heo 2024-09-04  3767  

:::::: The code at line 3765 was first introduced by commit
:::::: 8195136669661fdfe54e9a8923c33b31c92fc1da sched_ext: Add cgroup support

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

-- 
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https://github.com/intel/lkp-tests/wiki