mm/percpu.c:1748:1: warning: the frame size of 4304 bytes is larger than 2048 bytes

mm/percpu.c:1748:1: warning: the frame size of 4304 bytes is larger than 2048 bytes

[kernel test robot]

tree:   https://github.com/intel-lab-lkp/linux/commits/Alexandre-Ghiti/memcg-convert-task-objcg-to-a-per-node-objcgs-array/20260814-105220
head:   312c5531b4eccad1d6df5498a3f86bf6a3591348
commit: ece9a1822c4d19986136c28bef371b63ab7acd75 mm: percpu: per-node kmem accounting
date:   4 days ago
config: x86_64-rhel-9.4-bpf (https://download.01.org/0day-ci/archive/20260818/202608180909.rbuXZ2uR-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260818/202608180909.rbuXZ2uR-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/202608180909.rbuXZ2uR-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/percpu.c: In function 'pcpu_memcg_free_hook':
>> mm/percpu.c:1748:1: warning: the frame size of 4304 bytes is larger than 2048 bytes [-Wframe-larger-than=]
    1748 | }
         | ^
   mm/percpu.c: In function 'pcpu_memcg_post_alloc_hook.part.0':
   mm/percpu.c:1717:1: warning: the frame size of 4336 bytes is larger than 2048 bytes [-Wframe-larger-than=]
    1717 | }
         | ^


vim +1748 mm/percpu.c

3c7be18ac9a06b Roman Gushchin  2020-08-11  1718  
3c7be18ac9a06b Roman Gushchin  2020-08-11  1719  static void pcpu_memcg_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
3c7be18ac9a06b Roman Gushchin  2020-08-11  1720  {
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1721  	unsigned int node_bytes[MAX_NUMNODES] = { 0 };
3c7be18ac9a06b Roman Gushchin  2020-08-11  1722  	struct obj_cgroup *objcg;
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1723  	int nid;
3c7be18ac9a06b Roman Gushchin  2020-08-11  1724  
8f30d2660a38be Kent Overstreet 2024-03-21  1725  	if (unlikely(!chunk->obj_exts))
3c7be18ac9a06b Roman Gushchin  2020-08-11  1726  		return;
3c7be18ac9a06b Roman Gushchin  2020-08-11  1727  
8f30d2660a38be Kent Overstreet 2024-03-21  1728  	objcg = chunk->obj_exts[off >> PCPU_MIN_ALLOC_SHIFT].cgroup;
faf65dde844aff Roman Gushchin  2021-06-02  1729  	if (!objcg)
faf65dde844aff Roman Gushchin  2021-06-02  1730  		return;
8f30d2660a38be Kent Overstreet 2024-03-21  1731  	chunk->obj_exts[off >> PCPU_MIN_ALLOC_SHIFT].cgroup = NULL;
3c7be18ac9a06b Roman Gushchin  2020-08-11  1732  
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1733  	pcpu_memcg_accumulate_pages(chunk, off, size, node_bytes);
3c7be18ac9a06b Roman Gushchin  2020-08-11  1734  
772616b031f06e Roman Gushchin  2020-08-11  1735  	rcu_read_lock();
772616b031f06e Roman Gushchin  2020-08-11  1736  	mod_memcg_state(obj_cgroup_memcg(objcg), MEMCG_PERCPU_B,
8c57c07741bf28 Qi Zheng        2022-01-14  1737  			-pcpu_obj_full_size(size));
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1738  
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1739  	/* Uncharge each node the exact bytes it was charged at alloc. */
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1740  	for_each_online_node(nid) {
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1741  		if (node_bytes[nid])
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1742  			obj_cgroup_uncharge(obj_cgroup_nid(objcg, nid),
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1743  					    node_bytes[nid]);
ece9a1822c4d19 Alexandre Ghiti 2026-06-26  1744  	}
772616b031f06e Roman Gushchin  2020-08-11  1745  	rcu_read_unlock();
772616b031f06e Roman Gushchin  2020-08-11  1746  
3c7be18ac9a06b Roman Gushchin  2020-08-11  1747  	obj_cgroup_put(objcg);
3c7be18ac9a06b Roman Gushchin  2020-08-11 @1748  }
3c7be18ac9a06b Roman Gushchin  2020-08-11  1749  

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