linux-kernel - mm/kasan/kasan_test.c:36:6: sparse: sparse: symbol 'kasan_ptr_result' was not declared. Should it be static?

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Date:   Thu, 13 Oct 2022 04:08:02 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Marco Elver <elver@...gle.com>
Subject: mm/kasan/kasan_test.c:36:6: sparse: sparse: symbol
 'kasan_ptr_result' was not declared. Should it be static?

Hi Stephen,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   49da070062390094112b423ba443ea193527b2e4
commit: f7e01ab828fd4bf6d25b1f143a3994241e8572bf kasan: move tests to mm/kasan/
date:   9 days ago
config: arm-randconfig-s053-20221012
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7e01ab828fd4bf6d25b1f143a3994241e8572bf
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout f7e01ab828fd4bf6d25b1f143a3994241e8572bf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm SHELL=/bin/bash mm/kasan/

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

sparse warnings: (new ones prefixed by >>)
>> mm/kasan/kasan_test.c:36:6: sparse: sparse: symbol 'kasan_ptr_result' was not declared. Should it be static?
>> mm/kasan/kasan_test.c:37:5: sparse: sparse: symbol 'kasan_int_result' was not declared. Should it be static?

vim +/kasan_ptr_result +36 mm/kasan/kasan_test.c

f33a01492a24a2 lib/test_kasan.c Walter Wu        2020-08-06  31  
adb72ae1915db2 lib/test_kasan.c Daniel Axtens    2020-06-03  32  /*
0fd379253691e7 lib/test_kasan.c Andrey Konovalov 2021-02-24  33   * Some tests use these global variables to store return values from function
0fd379253691e7 lib/test_kasan.c Andrey Konovalov 2021-02-24  34   * calls that could otherwise be eliminated by the compiler as dead code.
adb72ae1915db2 lib/test_kasan.c Daniel Axtens    2020-06-03  35   */
adb72ae1915db2 lib/test_kasan.c Daniel Axtens    2020-06-03 @36  void *kasan_ptr_result;
83c4e7a0363bdb lib/test_kasan.c Patricia Alfonso 2020-10-13 @37  int kasan_int_result;
83c4e7a0363bdb lib/test_kasan.c Patricia Alfonso 2020-10-13  38  

:::::: The code at line 36 was first introduced by commit
:::::: adb72ae1915db28f934e9e02c18bfcea2f3ed3b7 kasan: stop tests being eliminated as dead code with FORTIFY_SOURCE

:::::: TO: Daniel Axtens <dja@...ens.net>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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

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