[arm-perf:rwonce/rework 7/16] arch/x86/include/asm/atomic.h:31:16: sparse: sparse: context imbalance in 'engines_sample' - different lock contexts for basic block

[arm-perf:rwonce/rework 7/16] arch/x86/include/asm/atomic.h:31:16: sparse: sparse: context imbalance in 'engines_sample' - different lock contexts for basic block

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git rwonce/rework
head:   b398ace5d2ea0b7f00d9f1ce23c647e289c206ca
commit: 9e343b467c70379e66b8b771d96f03ae23eba351 [7/16] READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses
config: x86_64-randconfig-s022-20200605 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-246-g41f651b4-dirty
        git checkout 9e343b467c70379e66b8b771d96f03ae23eba351
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

>> arch/x86/include/asm/atomic.h:31:16: sparse: sparse: context imbalance in 'engines_sample' - different lock contexts for basic block

vim +/engines_sample +31 arch/x86/include/asm/atomic.h

5abbbbf0b0cd4a Brian Gerst    2010-01-07  18  
5abbbbf0b0cd4a Brian Gerst    2010-01-07  19  /**
8bf705d130396e Dmitry Vyukov  2018-01-29  20   * arch_atomic_read - read atomic variable
5abbbbf0b0cd4a Brian Gerst    2010-01-07  21   * @v: pointer of type atomic_t
5abbbbf0b0cd4a Brian Gerst    2010-01-07  22   *
5abbbbf0b0cd4a Brian Gerst    2010-01-07  23   * Atomically reads the value of @v.
5abbbbf0b0cd4a Brian Gerst    2010-01-07  24   */
8bf705d130396e Dmitry Vyukov  2018-01-29  25  static __always_inline int arch_atomic_read(const atomic_t *v)
5abbbbf0b0cd4a Brian Gerst    2010-01-07  26  {
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  27  	/*
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  28  	 * Note for KASAN: we deliberately don't use READ_ONCE_NOCHECK() here,
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  29  	 * it's non-inlined function that increases binary size and stack usage.
ac605bee0bfab4 Dmitry Vyukov  2018-01-29  30  	 */
62e8a3258bda11 Peter Zijlstra 2015-09-18 @31  	return READ_ONCE((v)->counter);
5abbbbf0b0cd4a Brian Gerst    2010-01-07  32  }
5abbbbf0b0cd4a Brian Gerst    2010-01-07  33  

:::::: The code at line 31 was first introduced by commit
:::::: 62e8a3258bda118f24ff462fe04cfbe75b8189b5 atomic, arch: Audit atomic_{read,set}()

:::::: TO: Peter Zijlstra <peterz@infradead.org>
:::::: CC: Ingo Molnar <mingo@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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