linux-kernel - drivers/devfreq/event/exynos-ppmu.c:529:21: warning: cast to smaller integer type 'enum exynos_ppmu

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Message-ID: <202502272210.guXvXlHo-lkp@intel.com>
Date: Thu, 27 Feb 2025 22:18:36 +0800
From: kernel test robot <lkp@...el.com>
To: Lukasz Luba <l.luba@...tner.samsung.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
Subject: drivers/devfreq/event/exynos-ppmu.c:529:21: warning: cast to smaller
 integer type 'enum exynos_ppmu_type' from 'const void *'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dd83757f6e686a2188997cb58b5975f744bb7786
commit: 0ae9c3213c2ca34f7e7ebad1436267778d37ba9f PM / devfreq: exynos-events: change matching code during probe
date:   6 years ago
config: x86_64-buildonly-randconfig-006-20250127 (https://download.01.org/0day-ci/archive/20250227/202502272210.guXvXlHo-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250227/202502272210.guXvXlHo-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/202502272210.guXvXlHo-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/devfreq/event/exynos-ppmu.c:19:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:20:
   include/linux/mm.h:162:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     162 |         case 72:
         |         ^
   include/linux/mm.h:162:2: note: insert '__attribute__((fallthrough));' to silence this warning
     162 |         case 72:
         |         ^
         |         __attribute__((fallthrough)); 
   include/linux/mm.h:162:2: note: insert 'break;' to avoid fall-through
     162 |         case 72:
         |         ^
         |         break; 
   include/linux/mm.h:164:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     164 |         case 64:
         |         ^
   include/linux/mm.h:164:2: note: insert '__attribute__((fallthrough));' to silence this warning
     164 |         case 64:
         |         ^
         |         __attribute__((fallthrough)); 
   include/linux/mm.h:164:2: note: insert 'break;' to avoid fall-through
     164 |         case 64:
         |         ^
         |         break; 
   include/linux/mm.h:166:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
     166 |         case 56:
         |         ^
   include/linux/mm.h:166:2: note: insert '__attribute__((fallthrough));' to silence this warning
     166 |         case 56:
         |         ^
         |         __attribute__((fallthrough)); 
   include/linux/mm.h:166:2: note: insert 'break;' to avoid fall-through
     166 |         case 56:
         |         ^
         |         break; 
>> drivers/devfreq/event/exynos-ppmu.c:529:21: warning: cast to smaller integer type 'enum exynos_ppmu_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
     529 |                 info->ppmu_type = (enum exynos_ppmu_type)of_id->data;
         |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 warnings generated.


vim +529 drivers/devfreq/event/exynos-ppmu.c

   504	
   505	static int of_get_devfreq_events(struct device_node *np,
   506					 struct exynos_ppmu *info)
   507	{
   508		struct devfreq_event_desc *desc;
   509		struct device *dev = info->dev;
   510		struct device_node *events_np, *node;
   511		int i, j, count;
   512		const struct of_device_id *of_id;
   513	
   514		events_np = of_get_child_by_name(np, "events");
   515		if (!events_np) {
   516			dev_err(dev,
   517				"failed to get child node of devfreq-event devices\n");
   518			return -EINVAL;
   519		}
   520	
   521		count = of_get_child_count(events_np);
   522		desc = devm_kcalloc(dev, count, sizeof(*desc), GFP_KERNEL);
   523		if (!desc)
   524			return -ENOMEM;
   525		info->num_events = count;
   526	
   527		of_id = of_match_device(exynos_ppmu_id_match, dev);
   528		if (of_id)
 > 529			info->ppmu_type = (enum exynos_ppmu_type)of_id->data;
   530		else
   531			return -EINVAL;
   532	
   533		j = 0;
   534		for_each_child_of_node(events_np, node) {
   535			for (i = 0; i < ARRAY_SIZE(ppmu_events); i++) {
   536				if (!ppmu_events[i].name)
   537					continue;
   538	
   539				if (of_node_name_eq(node, ppmu_events[i].name))
   540					break;
   541			}
   542	
   543			if (i == ARRAY_SIZE(ppmu_events)) {
   544				dev_warn(dev,
   545					"don't know how to configure events : %pOFn\n",
   546					node);
   547				continue;
   548			}
   549	
   550			switch (info->ppmu_type) {
   551			case EXYNOS_TYPE_PPMU:
   552				desc[j].ops = &exynos_ppmu_ops;
   553				break;
   554			case EXYNOS_TYPE_PPMU_V2:
   555				desc[j].ops = &exynos_ppmu_v2_ops;
   556				break;
   557			}
   558	
   559			desc[j].driver_data = info;
   560	
   561			of_property_read_string(node, "event-name", &desc[j].name);
   562	
   563			j++;
   564		}
   565		info->desc = desc;
   566	
   567		of_node_put(events_np);
   568	
   569		return 0;
   570	}
   571	

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