Re: [PATCH] mm/damon/core: remove declaration of kdamond_fn()

Hi Zenghui,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Zenghui-Yu/mm-damon-core-remove-declaration-of-kdamond_fn/20260828-003953
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260827163953.83520-1-zenghui.yu%40linux.dev
patch subject: [PATCH] mm/damon/core: remove declaration of kdamond_fn()
config: hexagon-randconfig-r052-20260828 (https://download.01.org/0day-ci/archive/20260828/[email protected]/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260828/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

>> mm/damon/core.c:1941:30: error: use of undeclared identifier 'kdamond_fn'
    1941 |                 ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond.%d",
         |                                            ^
   1 error generated.


vim +/kdamond_fn +1941 mm/damon/core.c

b1029f29eb1d5fb SJ Park        2026-02-28  1924  
2224d8485492e49 SeongJae Park  2021-09-07  1925  /*
2224d8485492e49 SeongJae Park  2021-09-07  1926   * __damon_start() - Starts monitoring with given context.
2224d8485492e49 SeongJae Park  2021-09-07  1927   * @ctx:	monitoring context
2224d8485492e49 SeongJae Park  2021-09-07  1928   *
2224d8485492e49 SeongJae Park  2021-09-07  1929   * This function should be called while damon_lock is hold.
2224d8485492e49 SeongJae Park  2021-09-07  1930   *
2224d8485492e49 SeongJae Park  2021-09-07  1931   * Return: 0 on success, negative error code otherwise.
2224d8485492e49 SeongJae Park  2021-09-07  1932   */
2224d8485492e49 SeongJae Park  2021-09-07  1933  static int __damon_start(struct damon_ctx *ctx)
2224d8485492e49 SeongJae Park  2021-09-07  1934  {
2224d8485492e49 SeongJae Park  2021-09-07  1935  	int err = -EBUSY;
2224d8485492e49 SeongJae Park  2021-09-07  1936  
2224d8485492e49 SeongJae Park  2021-09-07  1937  	mutex_lock(&ctx->kdamond_lock);
2224d8485492e49 SeongJae Park  2021-09-07  1938  	if (!ctx->kdamond) {
2224d8485492e49 SeongJae Park  2021-09-07  1939  		err = 0;
6376a824595607e SJ Park        2023-12-08  1940  		reinit_completion(&ctx->kdamond_started);
2224d8485492e49 SeongJae Park  2021-09-07 @1941  		ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond.%d",
2224d8485492e49 SeongJae Park  2021-09-07  1942  				nr_running_ctxs);
2224d8485492e49 SeongJae Park  2021-09-07  1943  		if (IS_ERR(ctx->kdamond)) {
2224d8485492e49 SeongJae Park  2021-09-07  1944  			err = PTR_ERR(ctx->kdamond);
7ec1992b891e59d Colin Ian King 2021-11-05  1945  			ctx->kdamond = NULL;
6376a824595607e SJ Park        2023-12-08  1946  		} else {
6376a824595607e SJ Park        2023-12-08  1947  			wait_for_completion(&ctx->kdamond_started);
2224d8485492e49 SeongJae Park  2021-09-07  1948  		}
2224d8485492e49 SeongJae Park  2021-09-07  1949  	}
2224d8485492e49 SeongJae Park  2021-09-07  1950  	mutex_unlock(&ctx->kdamond_lock);
2224d8485492e49 SeongJae Park  2021-09-07  1951  
2224d8485492e49 SeongJae Park  2021-09-07  1952  	return err;
2224d8485492e49 SeongJae Park  2021-09-07  1953  }
2224d8485492e49 SeongJae Park  2021-09-07  1954  

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