Re: [PATCH v3 14/17] timer: Implement the hierarchical pull model

[kernel test robot <lkp@intel.com>]

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Hi Anna-Maria,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/timers/core]
[also build test WARNING on powerpc/next tip/x86/core linus/master tj-wq/for-next v6.1-rc2]
[cannot apply to tip/timers/nohz next-20221025]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Anna-Maria-Behnsen/timer-Move-from-a-push-remote-at-enqueue-to-a-pull-at-expiry-model/20221025-220106
patch link:    https://lore.kernel.org/r/20221025135850.51044-15-anna-maria%40linutronix.de
patch subject: [PATCH v3 14/17] timer: Implement the hierarchical pull model
config: x86_64-rhel-8.3-func (attached as .config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/b57766ae36b5e3dd11225f0259f9fd7d39a79e94
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Anna-Maria-Behnsen/timer-Move-from-a-push-remote-at-enqueue-to-a-pull-at-expiry-model/20221025-220106
        git checkout b57766ae36b5e3dd11225f0259f9fd7d39a79e94
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/time/

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

All warnings (new ones prefixed by >>):

   kernel/time/timer_migration.c: In function 'tmigr_cpu_deactivate':
   kernel/time/timer_migration.c:633:21: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     633 |                 u64 ret = tmc->wakeup;
         |                     ^~~
   In file included from include/linux/bitmap.h:9,
                    from include/linux/cpumask.h:12,
                    from arch/x86/include/asm/cpumask.h:5,
                    from arch/x86/include/asm/msr.h:11,
                    from arch/x86/include/asm/processor.h:22,
                    from arch/x86/include/asm/cpufeature.h:5,
                    from arch/x86/include/asm/thread_info.h:53,
                    from include/linux/thread_info.h:60,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:56,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/slab.h:15,
                    from kernel/time/timer_migration.c:8:
   kernel/time/timer_migration.c: In function 'tmigr_inactive_up':
>> include/linux/find.h:168:37: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'union tmigr_state[1]' [-Warray-bounds]
     168 |                 unsigned long val = *addr & GENMASK(size - 1, 0);
         |                                     ^~~~~
   kernel/time/timer_migration.c:495:37: note: while referencing 'newstate'
     495 |         union tmigr_state curstate, newstate;
         |                                     ^~~~~~~~


vim +168 include/linux/find.h

c7f612cdf091de include/asm-generic/bitops/find.h Akinobu Mita   2006-03-26  154  
b7ec62d7ee0f0b include/asm-generic/bitops/find.h Yury Norov     2021-08-14  155  #ifndef find_first_bit
708ff2a0097b02 include/asm-generic/bitops/find.h Akinobu Mita   2010-09-29  156  /**
708ff2a0097b02 include/asm-generic/bitops/find.h Akinobu Mita   2010-09-29  157   * find_first_bit - find the first set bit in a memory region
708ff2a0097b02 include/asm-generic/bitops/find.h Akinobu Mita   2010-09-29  158   * @addr: The address to start the search at
ec778edf97dcaa include/asm-generic/bitops/find.h Cody P Schafer 2013-11-12  159   * @size: The maximum number of bits to search
708ff2a0097b02 include/asm-generic/bitops/find.h Akinobu Mita   2010-09-29  160   *
708ff2a0097b02 include/asm-generic/bitops/find.h Akinobu Mita   2010-09-29  161   * Returns the bit number of the first set bit.
ec778edf97dcaa include/asm-generic/bitops/find.h Cody P Schafer 2013-11-12  162   * If no bits are set, returns @size.
708ff2a0097b02 include/asm-generic/bitops/find.h Akinobu Mita   2010-09-29  163   */
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  164  static inline
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  165  unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  166  {
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  167  	if (small_const_nbits(size)) {
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06 @168  		unsigned long val = *addr & GENMASK(size - 1, 0);
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  169  
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  170  		return val ? __ffs(val) : size;
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  171  	}
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  172  
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  173  	return _find_first_bit(addr, size);
2cc7b6a44ac21d include/asm-generic/bitops/find.h Yury Norov     2021-05-06  174  }
b7ec62d7ee0f0b include/asm-generic/bitops/find.h Yury Norov     2021-08-14  175  #endif
708ff2a0097b02 include/asm-generic/bitops/find.h Akinobu Mita   2010-09-29  176  

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