[sj:damon/next 112/124] mm/damon/core.c:1862:25: error: 'c' undeclared

[sj:damon/next 112/124] mm/damon/core.c:1862:25: error: 'c' undeclared

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sj/linux.git damon/next
head:   a8c204a2a82057d70dd8944476dd043dc52561ed
commit: 7fdffc23ed84ea44a9f15f71d15b00a94f326acd [112/124] mm/damon/core: unify damon_warn_fix_nr_accesses_corruption() with damon_verify_reset_aggregated()
config: sh-allyesconfig (https://download.01.org/0day-ci/archive/20260210/202602100155.sDqMXews-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260210/202602100155.sDqMXews-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/202602100155.sDqMXews-lkp@intel.com/

Note: the sj/damon/next HEAD a8c204a2a82057d70dd8944476dd043dc52561ed builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:31,
                    from arch/sh/include/asm/bug.h:112,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:13,
                    from include/asm-generic/current.h:6,
                    from ./arch/sh/include/generated/asm/current.h:1,
                    from include/linux/sched.h:12,
                    from include/linux/cgroup.h:12,
                    from include/linux/memcontrol.h:13,
                    from include/linux/damon.h:11,
                    from mm/damon/core.c:10:
   mm/damon/core.c: In function 'damon_warn_fix_nr_accesses_corruption':
>> mm/damon/core.c:1862:25: error: 'c' undeclared (first use in this function)
    1862 |                         c->passed_sample_intervals,
         |                         ^
   include/linux/printk.h:484:33: note: in definition of macro 'printk_index_wrap'
     484 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                                 ^~~~~~~~~~~
   include/linux/printk.h:555:9: note: in expansion of macro 'printk'
     555 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   mm/damon/core.c:1861:9: note: in expansion of macro 'pr_err'
    1861 |         pr_err("passed_sis %lu next_aggregation_sis %lu\n",
         |         ^~~~~~
   mm/damon/core.c:1862:25: note: each undeclared identifier is reported only once for each function it appears in
    1862 |                         c->passed_sample_intervals,
         |                         ^
   include/linux/printk.h:484:33: note: in definition of macro 'printk_index_wrap'
     484 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                                 ^~~~~~~~~~~
   include/linux/printk.h:555:9: note: in expansion of macro 'printk'
     555 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   mm/damon/core.c:1861:9: note: in expansion of macro 'pr_err'
    1861 |         pr_err("passed_sis %lu next_aggregation_sis %lu\n",
         |         ^~~~~~


vim +/c +1862 mm/damon/core.c

89796f03081328 SeongJae Park 2025-12-02  1844  
591c4c78be0636 SeongJae Park 2025-05-12  1845  /*
591c4c78be0636 SeongJae Park 2025-05-12  1846   * Warn and fix corrupted ->nr_accesses[_bp] for investigations and preventing
591c4c78be0636 SeongJae Park 2025-05-12  1847   * the problem being propagated.
591c4c78be0636 SeongJae Park 2025-05-12  1848   */
591c4c78be0636 SeongJae Park 2025-05-12  1849  static void damon_warn_fix_nr_accesses_corruption(struct damon_region *r)
591c4c78be0636 SeongJae Park 2025-05-12  1850  {
591c4c78be0636 SeongJae Park 2025-05-12  1851  	if (r->nr_accesses_bp == r->nr_accesses * 10000)
591c4c78be0636 SeongJae Park 2025-05-12  1852  		return;
7fdffc23ed84ea SeongJae Park 2026-02-04  1853  #ifndef CONFIG_DAMON_HARDENED
591c4c78be0636 SeongJae Park 2025-05-12  1854  	WARN_ONCE(true, "invalid nr_accesses_bp at reset: %u %u\n",
591c4c78be0636 SeongJae Park 2025-05-12  1855  			r->nr_accesses_bp, r->nr_accesses);
591c4c78be0636 SeongJae Park 2025-05-12  1856  	r->nr_accesses_bp = r->nr_accesses * 10000;
7fdffc23ed84ea SeongJae Park 2026-02-04  1857  #else
5b9f4fef2cb618 SeongJae Park 2026-01-03  1858  	pr_err("reset time invalid region found!\n");
5b9f4fef2cb618 SeongJae Park 2026-01-03  1859  	pr_err("nr_accesses_bp %u last_nr_acceses %u\n",
5b9f4fef2cb618 SeongJae Park 2026-01-03  1860  			r->nr_accesses_bp, r->last_nr_accesses);
5b9f4fef2cb618 SeongJae Park 2026-01-03  1861  	pr_err("passed_sis %lu next_aggregation_sis %lu\n",
5b9f4fef2cb618 SeongJae Park 2026-01-03 @1862  			c->passed_sample_intervals,
5b9f4fef2cb618 SeongJae Park 2026-01-03  1863  			c->next_aggregation_sis);
5b9f4fef2cb618 SeongJae Park 2026-01-03  1864  	BUG();
5b9f4fef2cb618 SeongJae Park 2026-01-03  1865  #endif
7fdffc23ed84ea SeongJae Park 2026-02-04  1866  }
5b9f4fef2cb618 SeongJae Park 2026-01-03  1867  

:::::: The code at line 1862 was first introduced by commit
:::::: 5b9f4fef2cb618ee597b3345dee579340e8d5d43 mm/damon/core: add damon_reset_aggregated() hardening

:::::: TO: SeongJae Park <sj@kernel.org>
:::::: CC: SeongJae Park <sj@kernel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [sj:damon/next 112/124] mm/damon/core.c:1862:25: error: 'c' undeclared

[SeongJae Park]

On Tue, 10 Feb 2026 01:35:06 +0800 kernel test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sj/linux.git damon/next
> head:   a8c204a2a82057d70dd8944476dd043dc52561ed
> commit: 7fdffc23ed84ea44a9f15f71d15b00a94f326acd [112/124] mm/damon/core: unify damon_warn_fix_nr_accesses_corruption() with damon_verify_reset_aggregated()
> config: sh-allyesconfig (https://download.01.org/0day-ci/archive/20260210/202602100155.sDqMXews-lkp@intel.com/config)
> compiler: sh4-linux-gcc (GCC) 15.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260210/202602100155.sDqMXews-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/202602100155.sDqMXews-lkp@intel.com/
> 
> Note: the sj/damon/next HEAD a8c204a2a82057d70dd8944476dd043dc52561ed builds fine.
>       It only hurts bisectability.

Thank you for this report.  Seems this is same to another one, that a fix [1]
has pushed a few hours ago.  I understand it is still making bisect
complicated, because the fix was made as a separate commit.  I will squash the
fix to the broken commit soon.

[1] https://lore.kernel.org/20260209151322.54520-1-sj@kernel.org


Thanks,
SJ

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