linux-kernel - Re: [PATCH] sparse: use static inline for __chk_{user,io}

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Date:   Fri, 28 Aug 2020 19:15:54 +0800
From:   kernel test robot <lkp@...el.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Subject: Re: [PATCH] sparse: use static inline for __chk_{user,io}_ptr()

Hi Luc,

I love your patch! Perhaps something to improve:

[auto build test WARNING on 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5]

url:    https://github.com/0day-ci/linux/commits/Luc-Van-Oostenryck/sparse-use-static-inline-for-__chk_-user-io-_ptr/20200828-165431
base:    9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
config: i386-randconfig-s001-20200828 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-191-g10164920-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/w1/slaves/w1_ds28e04.c:342:13: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __user *ptr @@     got char *buf @@
>> drivers/w1/slaves/w1_ds28e04.c:342:13: sparse:     expected void const volatile [noderef] __user *ptr
   drivers/w1/slaves/w1_ds28e04.c:342:13: sparse:     got char *buf
>> drivers/w1/slaves/w1_ds28e04.c:356:13: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __user *ptr @@     got char const *buf @@
   drivers/w1/slaves/w1_ds28e04.c:356:13: sparse:     expected void const volatile [noderef] __user *ptr
   drivers/w1/slaves/w1_ds28e04.c:356:13: sparse:     got char const *buf

# https://github.com/0day-ci/linux/commit/7d01c91ac34a64f0177bc6d058cc50e805f59102
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Luc-Van-Oostenryck/sparse-use-static-inline-for-__chk_-user-io-_ptr/20200828-165431
git checkout 7d01c91ac34a64f0177bc6d058cc50e805f59102
vim +342 drivers/w1/slaves/w1_ds28e04.c

fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21  338  
fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21  339  static ssize_t crccheck_show(struct device *dev, struct device_attribute *attr,
fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21  340  			     char *buf)
fbf7f7b4e2ae40 Markus Franke      2012-05-26  341  {
fbf7f7b4e2ae40 Markus Franke      2012-05-26 @342  	if (put_user(w1_enable_crccheck + 0x30, buf))
fbf7f7b4e2ae40 Markus Franke      2012-05-26  343  		return -EFAULT;
fbf7f7b4e2ae40 Markus Franke      2012-05-26  344  
fbf7f7b4e2ae40 Markus Franke      2012-05-26  345  	return sizeof(w1_enable_crccheck);
fbf7f7b4e2ae40 Markus Franke      2012-05-26  346  }
fbf7f7b4e2ae40 Markus Franke      2012-05-26  347  
fa33a65a9cf7e2 Greg Kroah-Hartman 2013-08-21  348  static ssize_t crccheck_store(struct device *dev, struct device_attribute *attr,
fbf7f7b4e2ae40 Markus Franke      2012-05-26  349  			      const char *buf, size_t count)
fbf7f7b4e2ae40 Markus Franke      2012-05-26  350  {
fbf7f7b4e2ae40 Markus Franke      2012-05-26  351  	char val;
fbf7f7b4e2ae40 Markus Franke      2012-05-26  352  
fbf7f7b4e2ae40 Markus Franke      2012-05-26  353  	if (count != 1 || !buf)
fbf7f7b4e2ae40 Markus Franke      2012-05-26  354  		return -EINVAL;
fbf7f7b4e2ae40 Markus Franke      2012-05-26  355  
fbf7f7b4e2ae40 Markus Franke      2012-05-26 @356  	if (get_user(val, buf))
fbf7f7b4e2ae40 Markus Franke      2012-05-26  357  		return -EFAULT;
fbf7f7b4e2ae40 Markus Franke      2012-05-26  358  
fbf7f7b4e2ae40 Markus Franke      2012-05-26  359  	/* convert to decimal */
fbf7f7b4e2ae40 Markus Franke      2012-05-26  360  	val = val - 0x30;
fbf7f7b4e2ae40 Markus Franke      2012-05-26  361  	if (val != 0 && val != 1)
fbf7f7b4e2ae40 Markus Franke      2012-05-26  362  		return -EINVAL;
fbf7f7b4e2ae40 Markus Franke      2012-05-26  363  
fbf7f7b4e2ae40 Markus Franke      2012-05-26  364  	/* set the new value */
fbf7f7b4e2ae40 Markus Franke      2012-05-26  365  	w1_enable_crccheck = val;
fbf7f7b4e2ae40 Markus Franke      2012-05-26  366  
fbf7f7b4e2ae40 Markus Franke      2012-05-26  367  	return sizeof(w1_enable_crccheck);
fbf7f7b4e2ae40 Markus Franke      2012-05-26  368  }
fbf7f7b4e2ae40 Markus Franke      2012-05-26  369  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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