linux-kernel - Re: [PATCH 2/3] leds: add debugfs to device trigger

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Message-ID: <201509291106.01PhMygT%fengguang.wu@intel.com>
Date:	Tue, 29 Sep 2015 11:41:11 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Maciek Borzecki <maciek.borzecki@...il.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org, linux-doc@...r.kernel.org,
	Jonathan Corbet <corbet@....net>,
	Maciek Borzecki <maciek.borzecki@...il.com>
Subject: Re: [PATCH 2/3] leds: add debugfs to device trigger

Hi Maciek,

[auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore]

reproduce:
  # apt-get install sparse
  make ARCH=x86_64 allmodconfig
  make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/leds/trigger/ledtrig-device.c:214:22: sparse: incorrect type in argument 1 (different address spaces)
   drivers/leds/trigger/ledtrig-device.c:214:22:    expected char const *<noident>
   drivers/leds/trigger/ledtrig-device.c:214:22:    got char const [noderef] <asn:1>*buf

vim +214 drivers/leds/trigger/ledtrig-device.c

   198		.read = seq_read,
   199		.llseek = seq_lseek,
   200		.release = single_release
   201	};
   202	
   203	static int get_dev_from_user(const char __user *buf, size_t size,
   204				dev_t *dev)
   205	{
   206		unsigned int major;
   207		unsigned int minor;
   208		int ret;
   209	
   210		WARN_ON(dev == NULL);
   211		if (dev == NULL)
   212			return -EINVAL;
   213	
 > 214		ret = sscanf(buf, "%u:%u", &major, &minor);
   215		if (ret < 2)
   216			return -EINVAL;
   217	
   218		*dev = MKDEV(major, minor);
   219		return 0;
   220	}
   221	
   222	static ssize_t ledtrig_dev_register_write(struct file *filp,

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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