linux-kernel - Re: [PATCH -next 2/3] mm/hugetlb_cgroup: prepare cftypes based on template

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Message-ID: <87bca9ca-0c3e-449a-b121-eee7b84dc2ed@moroto.mountain>
Date: Wed, 5 Jun 2024 08:24:28 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Xiu Jianfeng <xiujianfeng@...wei.com>,
	akpm@...ux-foundation.org, muchun.song@...ux.dev
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next 2/3] mm/hugetlb_cgroup: prepare cftypes based on
 template

Hi Xiu,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Xiu-Jianfeng/mm-hugetlb_cgroup-identify-the-legacy-using-cgroup_subsys_on_dfl/20240603-201513
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240603120506.1837322-3-xiujianfeng%40huawei.com
patch subject: [PATCH -next 2/3] mm/hugetlb_cgroup: prepare cftypes based on template
config: i386-randconfig-r071-20240604 (https://download.01.org/0day-ci/archive/20240605/202406050210.OWthxCFt-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0

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/202406050210.OWthxCFt-lkp@intel.com/

smatch warnings:
mm/hugetlb_cgroup.c:828 hugetlb_cgroup_cfttypes_init() warn: this array is probably non-NULL. 'tmpl->name'

vim +828 mm/hugetlb_cgroup.c

66bcc9ace99241 Xiu Jianfeng 2024-06-03  815  static void __init
66bcc9ace99241 Xiu Jianfeng 2024-06-03  816  hugetlb_cgroup_cfttypes_init(struct hstate *h, struct cftype *cft,
66bcc9ace99241 Xiu Jianfeng 2024-06-03  817  			     struct cftype *tmpl, int tmpl_size)
66bcc9ace99241 Xiu Jianfeng 2024-06-03  818  {
66bcc9ace99241 Xiu Jianfeng 2024-06-03  819  	char buf[32];
66bcc9ace99241 Xiu Jianfeng 2024-06-03  820  	int i, idx = hstate_index(h);
66bcc9ace99241 Xiu Jianfeng 2024-06-03  821  
66bcc9ace99241 Xiu Jianfeng 2024-06-03  822  	/* format the size */
66bcc9ace99241 Xiu Jianfeng 2024-06-03  823  	mem_fmt(buf, sizeof(buf), huge_page_size(h));
66bcc9ace99241 Xiu Jianfeng 2024-06-03  824  
66bcc9ace99241 Xiu Jianfeng 2024-06-03  825  	for (i = 0; i < tmpl_size; cft++, tmpl++, i++) {
66bcc9ace99241 Xiu Jianfeng 2024-06-03  826  		*cft = *tmpl;
66bcc9ace99241 Xiu Jianfeng 2024-06-03  827  		/* rebuild the name */
66bcc9ace99241 Xiu Jianfeng 2024-06-03 @828  		if (tmpl->name)
66bcc9ace99241 Xiu Jianfeng 2024-06-03  829  			snprintf(cft->name, MAX_CFTYPE_NAME, "%s.%s", buf, tmpl->name);

tmpl->name is an array so it's non-NULL.  Just do the snprintf().  No
need for the if statement.

66bcc9ace99241 Xiu Jianfeng 2024-06-03  830  		/* rebuild the private */
66bcc9ace99241 Xiu Jianfeng 2024-06-03  831  		if (tmpl->private)
66bcc9ace99241 Xiu Jianfeng 2024-06-03  832  			cft->private = MEMFILE_PRIVATE(idx, tmpl->private);
66bcc9ace99241 Xiu Jianfeng 2024-06-03  833  		/* rebuild the file_offset */
66bcc9ace99241 Xiu Jianfeng 2024-06-03  834  		if (tmpl->file_offset) {
66bcc9ace99241 Xiu Jianfeng 2024-06-03  835  			unsigned int offset = tmpl->file_offset;
66bcc9ace99241 Xiu Jianfeng 2024-06-03  836  
66bcc9ace99241 Xiu Jianfeng 2024-06-03  837  			cft->file_offset = MEMFILE_OFFSET0(offset) +
66bcc9ace99241 Xiu Jianfeng 2024-06-03  838  					   MEMFILE_FIELD_SIZE(offset) * idx;
66bcc9ace99241 Xiu Jianfeng 2024-06-03  839  		}
66bcc9ace99241 Xiu Jianfeng 2024-06-03  840  	}
66bcc9ace99241 Xiu Jianfeng 2024-06-03  841  }

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