[android-common:android14-kiwi-6.1 95/95] drivers/base/cacheinfo.c:259:5-11: WARNING: Unsigned expression compared with zero: leaves > 0

[android-common:android14-kiwi-6.1 95/95] drivers/base/cacheinfo.c:259:5-11: WARNING: Unsigned expression compared with zero: leaves > 0

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: cros-kernel-buildreports@googlegroups.com

tree:   https://android.googlesource.com/kernel/common android14-kiwi-6.1
head:   f32d30ba0d3898356d1a193eea42a9cbdeb348ba
commit: 100309b45cc4d18815f68c97db012ab9714e25e2 [95/95] cacheinfo: Check 'cache-unified' property to count cache leaves
:::::: branch date: 16 hours ago
:::::: commit date: 7 weeks ago
config: i386-randconfig-r054-20260126 (https://download.01.org/0day-ci/archive/20260126/202601260810.WCHpkdOG-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0

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@intel.com>
| Reported-by: Julia Lawall <julia.lawall@inria.fr>
| Closes: https://lore.kernel.org/r/202601260810.WCHpkdOG-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> drivers/base/cacheinfo.c:259:5-11: WARNING: Unsigned expression compared with zero: leaves > 0

vim +259 drivers/base/cacheinfo.c

100309b45cc4d1 Pierre Gondois 2025-10-21  250  
100309b45cc4d1 Pierre Gondois 2025-10-21  251  int init_of_cache_level(unsigned int cpu)
100309b45cc4d1 Pierre Gondois 2025-10-21  252  {
100309b45cc4d1 Pierre Gondois 2025-10-21  253  	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
100309b45cc4d1 Pierre Gondois 2025-10-21  254  	struct device_node *np = of_cpu_device_node_get(cpu);
100309b45cc4d1 Pierre Gondois 2025-10-21  255  	struct device_node *prev = NULL;
100309b45cc4d1 Pierre Gondois 2025-10-21  256  	unsigned int levels = 0, leaves, level;
100309b45cc4d1 Pierre Gondois 2025-10-21  257  
100309b45cc4d1 Pierre Gondois 2025-10-21  258  	leaves = of_count_cache_leaves(np);
a6d0510f295d99 Pierre Gondois 2025-10-21 @259  	if (leaves > 0)
a6d0510f295d99 Pierre Gondois 2025-10-21  260  		levels = 1;
a6d0510f295d99 Pierre Gondois 2025-10-21  261  
a6d0510f295d99 Pierre Gondois 2025-10-21  262  	prev = np;
a6d0510f295d99 Pierre Gondois 2025-10-21  263  	while ((np = of_find_next_cache_node(np))) {
a6d0510f295d99 Pierre Gondois 2025-10-21  264  		of_node_put(prev);
a6d0510f295d99 Pierre Gondois 2025-10-21  265  		prev = np;
a6d0510f295d99 Pierre Gondois 2025-10-21  266  		if (!of_device_is_compatible(np, "cache"))
52a43345ec152e Pierre Gondois 2025-10-21  267  			goto err_out;
a6d0510f295d99 Pierre Gondois 2025-10-21  268  		if (of_property_read_u32(np, "cache-level", &level))
52a43345ec152e Pierre Gondois 2025-10-21  269  			goto err_out;
a6d0510f295d99 Pierre Gondois 2025-10-21  270  		if (level <= levels)
52a43345ec152e Pierre Gondois 2025-10-21  271  			goto err_out;
100309b45cc4d1 Pierre Gondois 2025-10-21  272  
100309b45cc4d1 Pierre Gondois 2025-10-21  273  		leaves += of_count_cache_leaves(np);
a6d0510f295d99 Pierre Gondois 2025-10-21  274  		levels = level;
a6d0510f295d99 Pierre Gondois 2025-10-21  275  	}
a6d0510f295d99 Pierre Gondois 2025-10-21  276  
a6d0510f295d99 Pierre Gondois 2025-10-21  277  	of_node_put(np);
a6d0510f295d99 Pierre Gondois 2025-10-21  278  	this_cpu_ci->num_levels = levels;
a6d0510f295d99 Pierre Gondois 2025-10-21  279  	this_cpu_ci->num_leaves = leaves;
a6d0510f295d99 Pierre Gondois 2025-10-21  280  
a6d0510f295d99 Pierre Gondois 2025-10-21  281  	return 0;
52a43345ec152e Pierre Gondois 2025-10-21  282  
52a43345ec152e Pierre Gondois 2025-10-21  283  err_out:
52a43345ec152e Pierre Gondois 2025-10-21  284  	of_node_put(np);
52a43345ec152e Pierre Gondois 2025-10-21  285  	return -EINVAL;
a6d0510f295d99 Pierre Gondois 2025-10-21  286  }
a6d0510f295d99 Pierre Gondois 2025-10-21  287  

:::::: The code at line 259 was first introduced by commit
:::::: a6d0510f295d99739abe16349a9c5d7a7f0ee55d cacheinfo: Use RISC-V's init_cache_level() as generic OF implementation

:::::: TO: Pierre Gondois <pierre.gondois@arm.com>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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