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Message-ID: <202409261331.9NyGRPt2-lkp@intel.com>
Date: Thu, 26 Sep 2024 13:58:39 +0800
From: kernel test robot <lkp@...el.com>
To: ran xiaokai <ranxiaokai627@....com>, elver@...gle.com,
tglx@...utronix.de, dvyukov@...gle.com
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
Ran Xiaokai <ran.xiaokai@....com.cn>
Subject: Re: [PATCH 2/4] kcsan, debugfs: refactor
set_report_filterlist_whitelist() to return a value
Hi ran,
kernel test robot noticed the following build warnings:
[auto build test WARNING on linus/master]
[also build test WARNING on next-20240925]
[cannot apply to v6.11]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/ran-xiaokai/kcsan-debugfs-Remove-redundant-call-of-kallsyms_lookup_name/20240925-231034
base: linus/master
patch link: https://lore.kernel.org/r/20240925143154.2322926-3-ranxiaokai627%40163.com
patch subject: [PATCH 2/4] kcsan, debugfs: refactor set_report_filterlist_whitelist() to return a value
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20240926/202409261331.9NyGRPt2-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240926/202409261331.9NyGRPt2-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 <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409261331.9NyGRPt2-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/kcsan/debugfs.c:243:7: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
243 | if (kstrtoul(&arg[strlen("microbench=")], 0, &iters))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/kcsan/debugfs.c:256:6: note: uninitialized use occurs here
256 | if (ret < 0)
| ^~~
kernel/kcsan/debugfs.c:243:3: note: remove the 'if' if its condition is always true
243 | if (kstrtoul(&arg[strlen("microbench=")], 0, &iters))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
244 | return -EINVAL;
>> kernel/kcsan/debugfs.c:238:13: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
238 | } else if (!strcmp(arg, "off")) {
| ^~~~~~~~~~~~~~~~~~~
kernel/kcsan/debugfs.c:256:6: note: uninitialized use occurs here
256 | if (ret < 0)
| ^~~
kernel/kcsan/debugfs.c:238:9: note: remove the 'if' if its condition is always false
238 | } else if (!strcmp(arg, "off")) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
239 | WRITE_ONCE(kcsan_enabled, false);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
240 | } else if (str_has_prefix(arg, "microbench=")) {
| ~~~~~~
kernel/kcsan/debugfs.c:236:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
236 | if (!strcmp(arg, "on")) {
| ^~~~~~~~~~~~~~~~~~
kernel/kcsan/debugfs.c:256:6: note: uninitialized use occurs here
256 | if (ret < 0)
| ^~~
kernel/kcsan/debugfs.c:236:2: note: remove the 'if' if its condition is always false
236 | if (!strcmp(arg, "on")) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~
237 | WRITE_ONCE(kcsan_enabled, true);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
238 | } else if (!strcmp(arg, "off")) {
| ~~~~~~
kernel/kcsan/debugfs.c:229:13: note: initialize the variable 'ret' to silence this warning
229 | ssize_t ret;
| ^
| = 0
3 warnings generated.
vim +243 kernel/kcsan/debugfs.c
dfd402a4c4baae Marco Elver 2019-11-14 222
5cbaefe9743bf1 Ingo Molnar 2019-11-20 223 static ssize_t
5cbaefe9743bf1 Ingo Molnar 2019-11-20 224 debugfs_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
dfd402a4c4baae Marco Elver 2019-11-14 225 {
dfd402a4c4baae Marco Elver 2019-11-14 226 char kbuf[KSYM_NAME_LEN];
dfd402a4c4baae Marco Elver 2019-11-14 227 char *arg;
43d631bf06ec96 Thorsten Blum 2024-06-24 228 const size_t read_len = min(count, sizeof(kbuf) - 1);
52313281c8b7ca Ran Xiaokai 2024-09-25 229 ssize_t ret;
dfd402a4c4baae Marco Elver 2019-11-14 230
dfd402a4c4baae Marco Elver 2019-11-14 231 if (copy_from_user(kbuf, buf, read_len))
dfd402a4c4baae Marco Elver 2019-11-14 232 return -EFAULT;
dfd402a4c4baae Marco Elver 2019-11-14 233 kbuf[read_len] = '\0';
dfd402a4c4baae Marco Elver 2019-11-14 234 arg = strstrip(kbuf);
dfd402a4c4baae Marco Elver 2019-11-14 235
dfd402a4c4baae Marco Elver 2019-11-14 236 if (!strcmp(arg, "on")) {
dfd402a4c4baae Marco Elver 2019-11-14 237 WRITE_ONCE(kcsan_enabled, true);
dfd402a4c4baae Marco Elver 2019-11-14 @238 } else if (!strcmp(arg, "off")) {
dfd402a4c4baae Marco Elver 2019-11-14 239 WRITE_ONCE(kcsan_enabled, false);
a4e74fa5f0d3e2 Marco Elver 2020-07-31 240 } else if (str_has_prefix(arg, "microbench=")) {
dfd402a4c4baae Marco Elver 2019-11-14 241 unsigned long iters;
dfd402a4c4baae Marco Elver 2019-11-14 242
a4e74fa5f0d3e2 Marco Elver 2020-07-31 @243 if (kstrtoul(&arg[strlen("microbench=")], 0, &iters))
dfd402a4c4baae Marco Elver 2019-11-14 244 return -EINVAL;
dfd402a4c4baae Marco Elver 2019-11-14 245 microbenchmark(iters);
dfd402a4c4baae Marco Elver 2019-11-14 246 } else if (!strcmp(arg, "whitelist")) {
52313281c8b7ca Ran Xiaokai 2024-09-25 247 ret = set_report_filterlist_whitelist(true);
dfd402a4c4baae Marco Elver 2019-11-14 248 } else if (!strcmp(arg, "blacklist")) {
52313281c8b7ca Ran Xiaokai 2024-09-25 249 ret = set_report_filterlist_whitelist(false);
dfd402a4c4baae Marco Elver 2019-11-14 250 } else if (arg[0] == '!') {
52313281c8b7ca Ran Xiaokai 2024-09-25 251 ret = insert_report_filterlist(&arg[1]);
dfd402a4c4baae Marco Elver 2019-11-14 252 } else {
dfd402a4c4baae Marco Elver 2019-11-14 253 return -EINVAL;
dfd402a4c4baae Marco Elver 2019-11-14 254 }
dfd402a4c4baae Marco Elver 2019-11-14 255
52313281c8b7ca Ran Xiaokai 2024-09-25 256 if (ret < 0)
52313281c8b7ca Ran Xiaokai 2024-09-25 257 return ret;
52313281c8b7ca Ran Xiaokai 2024-09-25 258 else
dfd402a4c4baae Marco Elver 2019-11-14 259 return count;
dfd402a4c4baae Marco Elver 2019-11-14 260 }
dfd402a4c4baae Marco Elver 2019-11-14 261
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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