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X-CSE-ConnectionGUID: 6x2QZSxnRX2CS6R7ECEXEw== X-CSE-MsgGUID: tp4jRdzkTsOD6eusUJWdRg== X-IronPort-AV: E=McAfee;i="6800,10657,11888"; a="88525463" X-IronPort-AV: E=Sophos;i="6.25,248,1779174000"; d="scan'208";a="88525463" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Aug 2026 22:34:16 -0700 X-CSE-ConnectionGUID: 2JOw/X5sR7qW4b71mX5Ntg== X-CSE-MsgGUID: mIi6lFz/Rs6jYJK3+8P47g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,248,1779174000"; d="scan'208";a="270025508" Received: from lkp-server01.sh.intel.com (HELO 3532383e6126) ([10.239.97.150]) by fmviesa004.fm.intel.com with ESMTP; 27 Aug 2026 22:34:14 -0700 Received: from kbuild by 3532383e6126 with local (Exim 4.98.2) (envelope-from ) id 1wzpEB-00000000AST-1pk6; Fri, 28 Aug 2026 05:34:11 +0000 Date: Fri, 28 Aug 2026 13:33:29 +0800 From: kernel test robot To: Zenghui Yu , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: oe-kbuild-all@lists.linux.dev, sj@kernel.org, akpm@linux-foundation.org, "Zenghui Yu (Huawei)" Subject: Re: [PATCH] mm/damon/core: remove declaration of kdamond_fn() Message-ID: <202608281351.Hv386MvO-lkp@intel.com> References: <20260827163953.83520-1-zenghui.yu@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260827163953.83520-1-zenghui.yu@linux.dev> 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: xtensa-randconfig-r073-20260828 (https://download.01.org/0day-ci/archive/20260828/202608281351.Hv386MvO-lkp@intel.com/config) compiler: xtensa-linux-gcc (GCC) 16.1.0 smatch: v0.5.0-9187-g5189e3fb reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260828/202608281351.Hv386MvO-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 | Closes: https://lore.kernel.org/oe-kbuild-all/202608281351.Hv386MvO-lkp@intel.com/ All error/warnings (new ones prefixed by >>): In file included from include/linux/psi_types.h:5, from include/linux/cgroup-defs.h:24, from include/linux/cgroup.h:29, from include/linux/memcontrol.h:13, from include/linux/damon.h:10, from mm/damon/core.c:8: mm/damon/core.c: In function '__damon_start': >> mm/damon/core.c:1941:44: error: 'kdamond_fn' undeclared (first use in this function) 1941 | ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond.%d", | ^~~~~~~~~~ include/linux/kthread.h:46:32: note: in definition of macro 'kthread_create' 46 | kthread_create_on_node(threadfn, data, NUMA_NO_NODE, namefmt, ##arg) | ^~~~~~~~ mm/damon/core.c:1941:32: note: in expansion of macro 'kthread_run' 1941 | ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond.%d", | ^~~~~~~~~~~ mm/damon/core.c:1941:44: note: each undeclared identifier is reported only once for each function it appears in include/linux/kthread.h:46:32: note: in definition of macro 'kthread_create' 46 | kthread_create_on_node(threadfn, data, NUMA_NO_NODE, namefmt, ##arg) | ^~~~~~~~ mm/damon/core.c:1941:32: note: in expansion of macro 'kthread_run' 1941 | ctx->kdamond = kthread_run(kdamond_fn, ctx, "kdamond.%d", | ^~~~~~~~~~~ mm/damon/core.c: At top level: >> mm/damon/core.c:3750:12: warning: 'kdamond_fn' defined but not used [-Wunused-function] 3750 | static int kdamond_fn(void *data) | ^~~~~~~~~~ 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 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki