Re: [PATCH v2 1/2] memcg: introduce kfuncs for fetching memcg stats

[kernel test robot <lkp@intel.com>]

Hi JP,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/net]
[also build test WARNING on bpf-next/master bpf/master akpm-mm/mm-everything linus/master v6.18-rc1 next-20251016]
[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/JP-Kobryn/memcg-introduce-kfuncs-for-fetching-memcg-stats/20251016-030920
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git net
patch link:    https://lore.kernel.org/r/20251015190813.80163-2-inwardvessel%40gmail.com
patch subject: [PATCH v2 1/2] memcg: introduce kfuncs for fetching memcg stats
config: x86_64-randconfig-121-20251016 (https://download.01.org/0day-ci/archive/20251017/202510170654.s2j4GuCs-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251017/202510170654.s2j4GuCs-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510170654.s2j4GuCs-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   mm/memcontrol.c:4236:52: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/memcontrol.c:4236:52: sparse:    struct task_struct [noderef] __rcu *
   mm/memcontrol.c:4236:52: sparse:    struct task_struct *
>> mm/memcontrol.c:876:55: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct cgroup_subsys_state *css @@     got struct cgroup_subsys_state [noderef] __rcu * @@
   mm/memcontrol.c:876:55: sparse:     expected struct cgroup_subsys_state *css
   mm/memcontrol.c:876:55: sparse:     got struct cgroup_subsys_state [noderef] __rcu *
>> mm/memcontrol.c:876:55: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct cgroup_subsys_state *css @@     got struct cgroup_subsys_state [noderef] __rcu * @@
   mm/memcontrol.c:876:55: sparse:     expected struct cgroup_subsys_state *css
   mm/memcontrol.c:876:55: sparse:     got struct cgroup_subsys_state [noderef] __rcu *
>> mm/memcontrol.c:876:55: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct cgroup_subsys_state *css @@     got struct cgroup_subsys_state [noderef] __rcu * @@
   mm/memcontrol.c:876:55: sparse:     expected struct cgroup_subsys_state *css
   mm/memcontrol.c:876:55: sparse:     got struct cgroup_subsys_state [noderef] __rcu *
>> mm/memcontrol.c:876:55: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct cgroup_subsys_state *css @@     got struct cgroup_subsys_state [noderef] __rcu * @@
   mm/memcontrol.c:876:55: sparse:     expected struct cgroup_subsys_state *css
   mm/memcontrol.c:876:55: sparse:     got struct cgroup_subsys_state [noderef] __rcu *
   mm/memcontrol.c: note: in included file:
   include/linux/memcontrol.h:729:9: sparse: sparse: context imbalance in 'folio_lruvec_lock' - wrong count at exit
   include/linux/memcontrol.h:729:9: sparse: sparse: context imbalance in 'folio_lruvec_lock_irq' - wrong count at exit
   include/linux/memcontrol.h:729:9: sparse: sparse: context imbalance in 'folio_lruvec_lock_irqsave' - wrong count at exit

vim +876 mm/memcontrol.c

   873	
   874	static inline struct mem_cgroup *memcg_from_cgroup(struct cgroup *cgrp)
   875	{
 > 876		return cgrp ? mem_cgroup_from_css(cgrp->subsys[memory_cgrp_id]) : NULL;
   877	}
   878	

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