linux-kernel - Re: [PATCH v1 2/2] devres: Move devm_alloc

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Message-ID: <202511122250.550UBJAu-lkp@intel.com>
Date: Thu, 13 Nov 2025 12:49:34 +0800
From: kernel test robot <lkp@...el.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Philipp Stanner <phasta@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Jonathan Corbet <corbet@....net>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>
Subject: Re: [PATCH v1 2/2] devres: Move devm_alloc_percpu() and related to
 devres.h

Hi Andy,

kernel test robot noticed the following build errors:

[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.18-rc5 next-20251112]
[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/Andy-Shevchenko/devres-Remove-unused-devm_free_percpu/20251111-230827
base:   driver-core/driver-core-testing
patch link:    https://lore.kernel.org/r/20251111144104.910241-3-andriy.shevchenko%40linux.intel.com
patch subject: [PATCH v1 2/2] devres: Move devm_alloc_percpu() and related to devres.h
config: i386-buildonly-randconfig-004-20251112 (https://download.01.org/0day-ci/archive/20251112/202511122250.550UBJAu-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251112/202511122250.550UBJAu-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/202511122250.550UBJAu-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/gpio/gpiolib-devres.c:9:
>> include/linux/device/devres.h:113:6: error: variable has incomplete type 'void __attribute__((btf_type_tag("percpu")))' (aka 'void')
     113 | void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, size_t align);
         |      ^
   include/linux/compiler_types.h:60:19: note: expanded from macro '__percpu'
      60 | # define __percpu       __percpu_qual BTF_TYPE_TAG(percpu)
         |                         ^
   In file included from drivers/gpio/gpiolib-devres.c:9:
   include/linux/device/devres.h:113:14: error: expected ';' after top level declarator
     113 | void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, size_t align);
         |              ^
         |              ;
   2 errors generated.


vim +113 include/linux/device/devres.h

    98	
    99	/**
   100	 * devm_alloc_percpu - Resource-managed alloc_percpu
   101	 * @dev: Device to allocate per-cpu memory for
   102	 * @type: Type to allocate per-cpu memory for
   103	 *
   104	 * Managed alloc_percpu. Per-cpu memory allocated with this function is
   105	 * automatically freed on driver detach.
   106	 *
   107	 * RETURNS:
   108	 * Pointer to allocated memory on success, NULL on failure.
   109	 */
   110	#define devm_alloc_percpu(dev, type)      \
   111		((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), __alignof__(type)))
   112	
 > 113	void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, size_t align);
   114	

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