linux-kernel - arch/arm64/kernel/elfcore.c:25:12: warning: stack frame size (2144) exceeds limit (2048) in 'mte_dump_tag

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Message-ID: <202203300903.AceWJDUu-lkp@intel.com>
Date:   Wed, 30 Mar 2022 09:45:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Mark Brown <broonie@...nel.org>
Subject: arch/arm64/kernel/elfcore.c:25:12: warning: stack frame size (2144)
 exceeds limit (2048) in 'mte_dump_tag_range'

Hi Catalin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1c24a186398f59c80adb9a967486b65c1423a59d
commit: 6dd8b1a0b6cb3ed93d24110e02e67ff9d006610a arm64: mte: Dump the MTE tags in the core file
date:   6 weeks ago
config: arm64-randconfig-r002-20220330 (https://download.01.org/0day-ci/archive/20220330/202203300903.AceWJDUu-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6dd8b1a0b6cb3ed93d24110e02e67ff9d006610a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6dd8b1a0b6cb3ed93d24110e02e67ff9d006610a
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/

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 >>):

>> arch/arm64/kernel/elfcore.c:25:12: warning: stack frame size (2144) exceeds limit (2048) in 'mte_dump_tag_range' [-Wframe-larger-than]
   static int mte_dump_tag_range(struct coredump_params *cprm,
              ^
   1 warning generated.


vim +/mte_dump_tag_range +25 arch/arm64/kernel/elfcore.c

    23	
    24	/* Derived from dump_user_range(); start/end must be page-aligned */
  > 25	static int mte_dump_tag_range(struct coredump_params *cprm,
    26				      unsigned long start, unsigned long end)
    27	{
    28		unsigned long addr;
    29	
    30		for (addr = start; addr < end; addr += PAGE_SIZE) {
    31			char tags[MTE_PAGE_TAG_STORAGE];
    32			struct page *page = get_dump_page(addr);
    33	
    34			/*
    35			 * get_dump_page() returns NULL when encountering an empty
    36			 * page table entry that would otherwise have been filled with
    37			 * the zero page. Skip the equivalent tag dump which would
    38			 * have been all zeros.
    39			 */
    40			if (!page) {
    41				dump_skip(cprm, MTE_PAGE_TAG_STORAGE);
    42				continue;
    43			}
    44	
    45			/*
    46			 * Pages mapped in user space as !pte_access_permitted() (e.g.
    47			 * PROT_EXEC only) may not have the PG_mte_tagged flag set.
    48			 */
    49			if (!test_bit(PG_mte_tagged, &page->flags)) {
    50				put_page(page);
    51				dump_skip(cprm, MTE_PAGE_TAG_STORAGE);
    52				continue;
    53			}
    54	
    55			mte_save_page_tags(page_address(page), tags);
    56			put_page(page);
    57			if (!dump_emit(cprm, tags, MTE_PAGE_TAG_STORAGE))
    58				return 0;
    59		}
    60	
    61		return 1;
    62	}
    63	

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