linux-kernel - Re: [PATCH 2/5] mm/damon/sysfs: Implement a command to only commit scheme dests

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Message-ID: <202508101330.XRQqvfiN-lkp@intel.com>
Date: Mon, 11 Aug 2025 10:00:50 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Bijan Tabatabai <bijan311@...il.com>,
	damon@...ts.linux.dev, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, sj@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>, corbet@....net,
	Bijan Tabatabai <bijantabatab@...ron.com>
Subject: Re: [PATCH 2/5] mm/damon/sysfs: Implement a command to only commit
 scheme dests

Hi Bijan,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Bijan-Tabatabai/mm-damon-core-Add-damos_destroy_dests/20250806-120845
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250805162022.4920-3-bijan311%40gmail.com
patch subject: [PATCH 2/5] mm/damon/sysfs: Implement a command to only commit scheme dests
config: microblaze-randconfig-r072-20250810 (https://download.01.org/0day-ci/archive/20250810/202508101330.XRQqvfiN-lkp@intel.com/config)
compiler: microblaze-linux-gcc (GCC) 8.5.0

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@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202508101330.XRQqvfiN-lkp@intel.com/

smatch warnings:
mm/damon/sysfs-schemes.c:2605 damos_sysfs_set_schemes_dests() warn: iterator 'i' not incremented

vim +/i +2605 mm/damon/sysfs-schemes.c

8014d822c9939b Bijan Tabatabai 2025-08-05  2601  int damos_sysfs_set_schemes_dests(struct damon_sysfs_schemes *sysfs_schemes,
8014d822c9939b Bijan Tabatabai 2025-08-05  2602  		struct damon_ctx *ctx)
8014d822c9939b Bijan Tabatabai 2025-08-05  2603  {
8014d822c9939b Bijan Tabatabai 2025-08-05  2604  	struct damos *scheme;
8014d822c9939b Bijan Tabatabai 2025-08-05 @2605  	int i = 0;
8014d822c9939b Bijan Tabatabai 2025-08-05  2606  
8014d822c9939b Bijan Tabatabai 2025-08-05  2607  	damon_for_each_scheme(scheme, ctx) {
8014d822c9939b Bijan Tabatabai 2025-08-05  2608  		struct damos_sysfs_dests *sysfs_dests;
8014d822c9939b Bijan Tabatabai 2025-08-05  2609  		struct damos_migrate_dests dests = {};
8014d822c9939b Bijan Tabatabai 2025-08-05  2610  		int err;
8014d822c9939b Bijan Tabatabai 2025-08-05  2611  
8014d822c9939b Bijan Tabatabai 2025-08-05  2612  		/* user could have removed the scheme sysfs dir */
8014d822c9939b Bijan Tabatabai 2025-08-05  2613  		if (i >= sysfs_schemes->nr)

i is always zero.

8014d822c9939b Bijan Tabatabai 2025-08-05  2614  			break;
8014d822c9939b Bijan Tabatabai 2025-08-05  2615  
8014d822c9939b Bijan Tabatabai 2025-08-05  2616  		sysfs_dests = sysfs_schemes->schemes_arr[i]->dests;
8014d822c9939b Bijan Tabatabai 2025-08-05  2617  		err = damos_sysfs_add_migrate_dest(&dests, sysfs_dests);
8014d822c9939b Bijan Tabatabai 2025-08-05  2618  		if (err) {
8014d822c9939b Bijan Tabatabai 2025-08-05  2619  			damos_destroy_dests(&dests);
8014d822c9939b Bijan Tabatabai 2025-08-05  2620  			return err;
8014d822c9939b Bijan Tabatabai 2025-08-05  2621  		}
8014d822c9939b Bijan Tabatabai 2025-08-05  2622  
8014d822c9939b Bijan Tabatabai 2025-08-05  2623  		damos_destroy_dests(&scheme->migrate_dests);
8014d822c9939b Bijan Tabatabai 2025-08-05  2624  		scheme->migrate_dests = dests;
8014d822c9939b Bijan Tabatabai 2025-08-05  2625  	}
8014d822c9939b Bijan Tabatabai 2025-08-05  2626  
8014d822c9939b Bijan Tabatabai 2025-08-05  2627  	return 0;
8014d822c9939b Bijan Tabatabai 2025-08-05  2628  }

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