[sj:mm-new 39/45] arch/x86/include/asm/atomic.h:23: undefined reference to `kasan_flag_enabled'

[sj:mm-new 39/45] arch/x86/include/asm/atomic.h:23: undefined reference to `kasan_flag_enabled'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sj/linux.git mm-new
head:   b2a4beca30ba51331a16d7bb84387a70b692a66d
commit: 825af80daf827d439c7dd3e24ef5648cc338bc98 [39/45] mm/kasan: make kasan=on|off take effect for all three modes
config: um-randconfig-002-20250807 (https://download.01.org/0day-ci/archive/20250807/202508070658.s1RZB1Fd-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250807/202508070658.s1RZB1Fd-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/202508070658.s1RZB1Fd-lkp@intel.com/

All errors (new ones prefixed by >>):

   /usr/bin/ld: lib/stackdepot.o: in function `stack_depot_early_init':
   stackdepot.c:(.init.text+0x21f): undefined reference to `kasan_flag_enabled'
   /usr/bin/ld: mm/mempool.o: in function `remove_element':
>> arch/x86/include/asm/atomic.h:23: undefined reference to `kasan_flag_enabled'
   /usr/bin/ld: mm/mempool.o: in function `poison_element':
>> arch/x86/include/asm/atomic.h:23: undefined reference to `kasan_flag_enabled'
   collect2: error: ld returned 1 exit status


vim +23 arch/x86/include/asm/atomic.h

5abbbbf0b0cd4a Brian Gerst    2010-01-07  11  
5abbbbf0b0cd4a Brian Gerst    2010-01-07  12  /*
5abbbbf0b0cd4a Brian Gerst    2010-01-07  13   * Atomic operations that C can't guarantee us.  Useful for
5abbbbf0b0cd4a Brian Gerst    2010-01-07  14   * resource counting etc..
5abbbbf0b0cd4a Brian Gerst    2010-01-07  15   */
5abbbbf0b0cd4a Brian Gerst    2010-01-07  16  
8bf705d130396e Dmitry Vyukov  2018-01-29  17  static __always_inline int arch_atomic_read(const atomic_t *v)
5abbbbf0b0cd4a Brian Gerst    2010-01-07  18  {
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  19  	/*
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  20  	 * Note for KASAN: we deliberately don't use READ_ONCE_NOCHECK() here,
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  21  	 * it's non-inlined function that increases binary size and stack usage.
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  22  	 */
37f8173dd84936 Peter Zijlstra 2020-01-24 @23  	return __READ_ONCE((v)->counter);
5abbbbf0b0cd4a Brian Gerst    2010-01-07  24  }
5abbbbf0b0cd4a Brian Gerst    2010-01-07  25  

:::::: The code at line 23 was first introduced by commit
:::::: 37f8173dd84936ea78000ed1cad24f8b18d48ebb locking/atomics: Flip fallbacks and instrumentation

:::::: TO: Peter Zijlstra <peterz@infradead.org>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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