linux-kernel - [hnaz-mm:master 280/410] lib/maple_tree.c:4207:20: warning: stack frame size (1088) exceeds limit (1024) in 'mas_wr

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Date:   Sat, 30 Apr 2022 07:15:36 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: [hnaz-mm:master 280/410] lib/maple_tree.c:4207:20: warning: stack
 frame size (1088) exceeds limit (1024) in 'mas_wr_modify'

tree:   https://github.com/hnaz/linux-mm master
head:   bf4803abaa3e9d2fa207c0675a2d2abf0fd44f66
commit: c11c433e3be4e5bef47f0a62a72064e18708e952 [280/410] Maple Tree: add new data structure
config: arm-moxart_defconfig (https://download.01.org/0day-ci/archive/20220430/202204300731.xnlH7nv1-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 400775649969b9baf3bc2a510266e7912bb16ae9)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/hnaz/linux-mm/commit/c11c433e3be4e5bef47f0a62a72064e18708e952
        git remote add hnaz-mm https://github.com/hnaz/linux-mm
        git fetch --no-tags hnaz-mm master
        git checkout c11c433e3be4e5bef47f0a62a72064e18708e952
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

   lib/maple_tree.c:324:20: warning: unused function 'mte_set_full' [-Wunused-function]
   static inline void mte_set_full(const struct maple_enode *node)
                      ^
   lib/maple_tree.c:329:20: warning: unused function 'mte_clear_full' [-Wunused-function]
   static inline void mte_clear_full(const struct maple_enode *node)
                      ^
>> lib/maple_tree.c:4207:20: warning: stack frame size (1088) exceeds limit (1024) in 'mas_wr_modify' [-Wframe-larger-than]
   static inline void mas_wr_modify(struct ma_wr_state *wr_mas)
                      ^
   3 warnings generated.


vim +/mas_wr_modify +4207 lib/maple_tree.c

  4206	
> 4207	static inline void mas_wr_modify(struct ma_wr_state *wr_mas)
  4208	{
  4209		unsigned char node_slots;
  4210		unsigned char node_size;
  4211		struct ma_state *mas = wr_mas->mas;
  4212		struct maple_big_node b_node;
  4213	
  4214		/* Direct replacement */
  4215		if (wr_mas->r_min == mas->index && wr_mas->r_max == mas->last) {
  4216			rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry);
  4217			if (!!wr_mas->entry ^ !!wr_mas->content)
  4218				mas_update_gap(mas);
  4219			return;
  4220		}
  4221	
  4222		/* Attempt to append */
  4223		node_slots = mt_slots[wr_mas->type];
  4224		node_size = wr_mas->node_end - wr_mas->offset_end + mas->offset + 2;
  4225		if (mas->max == ULONG_MAX)
  4226			node_size++;
  4227	
  4228		/* slot and node store will not fit, go to the slow path */
  4229		if (unlikely(node_size >= node_slots))
  4230			goto slow_path;
  4231	
  4232		if (wr_mas->entry && (wr_mas->node_end < node_slots - 1) &&
  4233		    (mas->offset == wr_mas->node_end) && mas_wr_append(wr_mas)) {
  4234				if (!wr_mas->content || !wr_mas->entry)
  4235					mas_update_gap(mas);
  4236				return;
  4237		}
  4238	
  4239		if ((wr_mas->offset_end - mas->offset <= 1) && mas_wr_slot_store(wr_mas))
  4240			return;
  4241		else if (mas_wr_node_store(wr_mas))
  4242			return;
  4243	
  4244		if (mas_is_err(mas))
  4245			return;
  4246	
  4247	slow_path:
  4248		memset(&b_node, 0, sizeof(struct maple_big_node));
  4249		mas_store_b_node(wr_mas, &b_node, wr_mas->offset_end);
  4250		trace_ma_write(__func__, mas, 0, wr_mas->entry);
  4251		mas_commit_b_node(wr_mas, &b_node, wr_mas->node_end);
  4252	}
  4253	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp