Hi Eddie,

I love your patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.2-rc2 next-20221226]
[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/Eddie-James/tpm-Add-reserved-memory-event-log/20230104-002229
patch link:    https://lore.kernel.org/r/20230103162010.381214-1-eajames%40linux.ibm.com
patch subject: [PATCH] tpm: Add reserved memory event log
config: arm-buildonly-randconfig-r005-20230101
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 7a8cb6cd4e3ff8aaadebff2b9d3ee9e2a326d444)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/6aebeea318ade8b695dc36f4c5a2ad166ae4f1a7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Eddie-James/tpm-Add-reserved-memory-event-log/20230104-002229
        git checkout 6aebeea318ade8b695dc36f4c5a2ad166ae4f1a7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/char/tpm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/char/tpm/tpm-chip.c:24:
   include/linux/tpm_eventlog.h:167:6: warning: variable 'mapping_size' set but not used [-Wunused-but-set-variable]
           int mapping_size;
               ^
>> drivers/char/tpm/tpm-chip.c:327:22: warning: cast from 'void (*)(const void *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
           chip->log.release = (void(*)(void *))kfree;
                               ^~~~~~~~~~~~~~~~~~~~~~
   2 warnings generated.


vim +327 drivers/char/tpm/tpm-chip.c

   302	
   303	/**
   304	 * tpm_chip_alloc() - allocate a new struct tpm_chip instance
   305	 * @pdev: device to which the chip is associated
   306	 *        At this point pdev mst be initialized, but does not have to
   307	 *        be registered
   308	 * @ops: struct tpm_class_ops instance
   309	 *
   310	 * Allocates a new struct tpm_chip instance and assigns a free
   311	 * device number for it. Must be paired with put_device(&chip->dev).
   312	 */
   313	struct tpm_chip *tpm_chip_alloc(struct device *pdev,
   314					const struct tpm_class_ops *ops)
   315	{
   316		struct tpm_chip *chip;
   317		int rc;
   318	
   319		chip = kzalloc(sizeof(*chip), GFP_KERNEL);
   320		if (chip == NULL)
   321			return ERR_PTR(-ENOMEM);
   322	
   323		mutex_init(&chip->tpm_mutex);
   324		init_rwsem(&chip->ops_sem);
   325	
   326		chip->ops = ops;
 > 327		chip->log.release = (void(*)(void *))kfree;
   328	
   329		mutex_lock(&idr_lock);
   330		rc = idr_alloc(&dev_nums_idr, NULL, 0, TPM_NUM_DEVICES, GFP_KERNEL);
   331		mutex_unlock(&idr_lock);
   332		if (rc < 0) {
   333			dev_err(pdev, "No available tpm device numbers\n");
   334			kfree(chip);
   335			return ERR_PTR(rc);
   336		}
   337		chip->dev_num = rc;
   338	
   339		device_initialize(&chip->dev);
   340	
   341		chip->dev.class = tpm_class;
   342		chip->dev.class->shutdown_pre = tpm_class_shutdown;
   343		chip->dev.release = tpm_dev_release;
   344		chip->dev.parent = pdev;
   345		chip->dev.groups = chip->groups;
   346	
   347		if (chip->dev_num == 0)
   348			chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);
   349		else
   350			chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);
   351	
   352		rc = dev_set_name(&chip->dev, "tpm%d", chip->dev_num);
   353		if (rc)
   354			goto out;
   355	
   356		if (!pdev)
   357			chip->flags |= TPM_CHIP_FLAG_VIRTUAL;
   358	
   359		cdev_init(&chip->cdev, &tpm_fops);
   360		chip->cdev.owner = THIS_MODULE;
   361	
   362		rc = tpm2_init_space(&chip->work_space, TPM2_SPACE_BUFFER_SIZE);
   363		if (rc) {
   364			rc = -ENOMEM;
   365			goto out;
   366		}
   367	
   368		chip->locality = -1;
   369		return chip;
   370	
   371	out:
   372		put_device(&chip->dev);
   373		return ERR_PTR(rc);
   374	}
   375	EXPORT_SYMBOL_GPL(tpm_chip_alloc);
   376	

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