linux-kernel - Re: [PATCH v1] binder: implement binderfs

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Message-ID: <201812140031.n9YDJDkL%fengguang.wu@intel.com>
Date:   Fri, 14 Dec 2018 00:44:26 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Christian Brauner <christian@...uner.io>
Cc:     kbuild-all@...org, gregkh@...uxfoundation.org, tkjos@...roid.com,
        maco@...roid.com, linux-kernel@...r.kernel.org, arve@...roid.com,
        joel@...lfernandes.org, darrick.wong@...cle.com,
        david@...morbit.com, kilobyte@...band.pl,
        devel@...verdev.osuosl.org, chouryzhou@...cent.com,
        tkjos@...gle.com, Christian Brauner <christian@...uner.io>
Subject: Re: [PATCH v1] binder: implement binderfs

Hi Christian,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on staging/staging-testing]
[also build test WARNING on v4.20-rc6 next-20181212]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Christian-Brauner/binder-implement-binderfs/20181210-003538
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   include/linux/slab.h:332:43: warning: dubious: x & !y
   include/linux/slab.h:332:43: warning: dubious: x & !y
>> drivers/android/binderfs.c:232:43: warning: incorrect type in initializer (different address spaces)
   drivers/android/binderfs.c:232:43:    expected struct binderfs_device *device
   drivers/android/binderfs.c:232:43:    got struct binderfs_device [noderef] <asn:1>*<noident>
>> drivers/android/binderfs.c:238:51: warning: incorrect type in argument 2 (different address spaces)
   drivers/android/binderfs.c:238:51:    expected void const [noderef] <asn:1>*from
   drivers/android/binderfs.c:238:51:    got struct binderfs_device *device
   drivers/android/binderfs.c:242:60: warning: incorrect type in argument 2 (different address spaces)
   drivers/android/binderfs.c:242:60:    expected struct binderfs_device [noderef] <asn:1>*userp
   drivers/android/binderfs.c:242:60:    got struct binderfs_device *device
   include/linux/slab.h:332:43: warning: dubious: x & !y
   include/linux/slab.h:332:43: warning: dubious: x & !y

vim +232 drivers/android/binderfs.c

   215	
   216	/**
   217	 * binderfs_ctl_ioctl - handle binder device node allocation requests
   218	 *
   219	 * The request handler for the binder-control device. All requests operate on
   220	 * the binderfs mount the binder-control device resides in:
   221	 * - BINDER_CTL_ADD
   222	 *   Allocate a new binder device.
   223	 *
   224	 * Return: 0 on success, negative errno on failure
   225	 */
   226	static long binder_ctl_ioctl(struct file *file, unsigned int cmd,
   227				     unsigned long arg)
   228	{
   229		struct binderfs_info *info;
   230		int ret = -EINVAL;
   231		struct inode *inode = file_inode(file);
 > 232		struct binderfs_device *device = (struct binderfs_device __user *)arg;
   233		struct binderfs_device device_req;
   234	
   235		info = BINDERFS_I(inode);
   236		switch (cmd) {
   237		case BINDER_CTL_ADD:
 > 238			ret = copy_from_user(&device_req, device, sizeof(device_req));
   239			if (ret)
   240				break;
   241	
   242			ret = binderfs_binder_device_create(inode, device, &device_req);
   243			break;
   244		default:
   245			break;
   246		}
   247	
   248		return ret;
   249	}
   250	

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