mm/damon/core.c:2050 damos_adjust_quota() error: uninitialized symbol 'cached_esz'.

mm/damon/core.c:2050 damos_adjust_quota() error: uninitialized symbol 'cached_esz'.

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: SeongJae Park <sj@kernel.org>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7ea30958b3054f5e488fa0b33c352723f7ab3a2a
commit: a86d695193bfab3f130f9275c275e4e143dcd2e3 mm/damon: add trace event for effective size quota
date:   3 months ago
:::::: branch date: 17 hours ago
:::::: commit date: 3 months ago
config: i386-randconfig-141-20251016 (https://download.01.org/0day-ci/archive/20251016/202510162333.YNUPa5FO-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)

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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202510162333.YNUPa5FO-lkp@intel.com/

smatch warnings:
mm/damon/core.c:2050 damos_adjust_quota() error: uninitialized symbol 'cached_esz'.

vim +/cached_esz +2050 mm/damon/core.c

a86d695193bfab3 SeongJae Park 2025-07-04  2027  
898810e5ca54691 SeongJae Park 2022-10-26  2028  static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
1f366e421c8f695 SeongJae Park 2021-11-05  2029  {
2b8a248d5873343 SeongJae Park 2021-11-05  2030  	struct damos_quota *quota = &s->quota;
898810e5ca54691 SeongJae Park 2022-10-26  2031  	struct damon_target *t;
898810e5ca54691 SeongJae Park 2022-10-26  2032  	struct damon_region *r;
a86d695193bfab3 SeongJae Park 2025-07-04  2033  	unsigned long cumulated_sz, cached_esz;
38683e003153f7a SeongJae Park 2021-11-05  2034  	unsigned int score, max_score = 0;
2b8a248d5873343 SeongJae Park 2021-11-05  2035  
89d347a545a704e SeongJae Park 2024-02-19  2036  	if (!quota->ms && !quota->sz && list_empty(&quota->goals))
898810e5ca54691 SeongJae Park 2022-10-26  2037  		return;
2b8a248d5873343 SeongJae Park 2021-11-05  2038  
2b8a248d5873343 SeongJae Park 2021-11-05  2039  	/* New charge window starts */
2b8a248d5873343 SeongJae Park 2021-11-05  2040  	if (time_after_eq(jiffies, quota->charged_from +
898810e5ca54691 SeongJae Park 2022-10-26  2041  				msecs_to_jiffies(quota->reset_interval))) {
6268eac34ca30af SeongJae Park 2022-01-14  2042  		if (quota->esz && quota->charged_sz >= quota->esz)
6268eac34ca30af SeongJae Park 2022-01-14  2043  			s->stat.qt_exceeds++;
1cd2430300594a2 SeongJae Park 2021-11-05  2044  		quota->total_charged_sz += quota->charged_sz;
2b8a248d5873343 SeongJae Park 2021-11-05  2045  		quota->charged_from = jiffies;
2b8a248d5873343 SeongJae Park 2021-11-05  2046  		quota->charged_sz = 0;
a86d695193bfab3 SeongJae Park 2025-07-04  2047  		if (trace_damos_esz_enabled())
a86d695193bfab3 SeongJae Park 2025-07-04  2048  			cached_esz = quota->esz;
1cd2430300594a2 SeongJae Park 2021-11-05  2049  		damos_set_effective_quota(quota);
a86d695193bfab3 SeongJae Park 2025-07-04 @2050  		if (trace_damos_esz_enabled() && quota->esz != cached_esz)
a86d695193bfab3 SeongJae Park 2025-07-04  2051  			damos_trace_esz(c, s, quota);
2b8a248d5873343 SeongJae Park 2021-11-05  2052  	}
38683e003153f7a SeongJae Park 2021-11-05  2053  
f7d911c39cbbb88 SeongJae Park 2022-03-22  2054  	if (!c->ops.get_scheme_score)
898810e5ca54691 SeongJae Park 2022-10-26  2055  		return;
38683e003153f7a SeongJae Park 2021-11-05  2056  
38683e003153f7a SeongJae Park 2021-11-05  2057  	/* Fill up the score histogram */
304b95847f28520 SeongJae Park 2024-08-25  2058  	memset(c->regions_score_histogram, 0,
304b95847f28520 SeongJae Park 2024-08-25  2059  			sizeof(*c->regions_score_histogram) *
304b95847f28520 SeongJae Park 2024-08-25  2060  			(DAMOS_MAX_SCORE + 1));
38683e003153f7a SeongJae Park 2021-11-05  2061  	damon_for_each_target(t, c) {
38683e003153f7a SeongJae Park 2021-11-05  2062  		damon_for_each_region(r, t) {
38683e003153f7a SeongJae Park 2021-11-05  2063  			if (!__damos_valid_target(r, s))
38683e003153f7a SeongJae Park 2021-11-05  2064  				continue;
898810e5ca54691 SeongJae Park 2022-10-26  2065  			score = c->ops.get_scheme_score(c, t, r, s);
304b95847f28520 SeongJae Park 2024-08-25  2066  			c->regions_score_histogram[score] +=
304b95847f28520 SeongJae Park 2024-08-25  2067  				damon_sz_region(r);
38683e003153f7a SeongJae Park 2021-11-05  2068  			if (score > max_score)
38683e003153f7a SeongJae Park 2021-11-05  2069  				max_score = score;
38683e003153f7a SeongJae Park 2021-11-05  2070  		}
38683e003153f7a SeongJae Park 2021-11-05  2071  	}
38683e003153f7a SeongJae Park 2021-11-05  2072  
38683e003153f7a SeongJae Park 2021-11-05  2073  	/* Set the min score limit */
38683e003153f7a SeongJae Park 2021-11-05  2074  	for (cumulated_sz = 0, score = max_score; ; score--) {
304b95847f28520 SeongJae Park 2024-08-25  2075  		cumulated_sz += c->regions_score_histogram[score];
38683e003153f7a SeongJae Park 2021-11-05  2076  		if (cumulated_sz >= quota->esz || !score)
38683e003153f7a SeongJae Park 2021-11-05  2077  			break;
38683e003153f7a SeongJae Park 2021-11-05  2078  	}
38683e003153f7a SeongJae Park 2021-11-05  2079  	quota->min_score = score;
2b8a248d5873343 SeongJae Park 2021-11-05  2080  }
1f366e421c8f695 SeongJae Park 2021-11-05  2081  

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