linux-kernel - Re: [v4] i2c: Add PCI and platform drivers for the AMD MP2 I2C controller

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Date:   Wed, 24 Oct 2018 11:49:02 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Elie Morisse <syniurge@...il.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
        Elie Morisse <syniurge@...il.com>
Subject: Re: [v4] i2c: Add PCI and platform drivers for the AMD MP2 I2C
 controller

Hi Elie,

I love your patch! Perhaps something to improve:

[auto build test WARNING on wsa/i2c/for-next]
[also build test WARNING on v4.19 next-20181019]
[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/Elie-Morisse/i2c-Add-PCI-and-platform-drivers-for-the-AMD-MP2-I2C-controller/20181024-013625
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
config: i386-allyesconfig (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=i386 

All warnings (new ones prefixed by >>):

   drivers/i2c/busses/i2c-amd-pci-mp2.c: In function 'amd_mp2_debugfs_read':
>> drivers/i2c/busses/i2c-amd-pci-mp2.c:298:66: warning: comparison of distinct pointer types lacks a cast
     buf_size = min(count, 0x800ul);
                                                                     ^ 

vim +298 drivers/i2c/busses/i2c-amd-pci-mp2.c

   285	
   286	static ssize_t amd_mp2_debugfs_read(struct file *filp, char __user *ubuf,
   287					    size_t count, loff_t *offp)
   288	{
   289		struct amd_mp2_dev *privdata;
   290		void __iomem *mmio;
   291		u8 *buf;
   292		size_t buf_size;
   293		ssize_t ret, off;
   294		u32 v32;
   295	
   296		privdata = filp->private_data;
   297		mmio = privdata->mmio;
 > 298		buf_size = min(count, 0x800ul);
   299		buf = kmalloc(buf_size, GFP_KERNEL);
   300	
   301		if (!buf)
   302			return -ENOMEM;
   303	
   304		off = 0;
   305		off += scnprintf(buf + off, buf_size - off,
   306				"Mp2 Device Information:\n");
   307	
   308		off += scnprintf(buf + off, buf_size - off,
   309				"========================\n");
   310		off += scnprintf(buf + off, buf_size - off,
   311				"\tMP2 C2P Message Register Dump:\n\n");
   312		v32 = readl(privdata->mmio + AMD_C2P_MSG0);
   313		off += scnprintf(buf + off, buf_size - off,
   314				"AMD_C2P_MSG0 -\t\t\t%#06x\n", v32);
   315	
   316		v32 = readl(privdata->mmio + AMD_C2P_MSG1);
   317		off += scnprintf(buf + off, buf_size - off,
   318				"AMD_C2P_MSG1 -\t\t\t%#06x\n", v32);
   319	
   320		v32 = readl(privdata->mmio + AMD_C2P_MSG2);
   321		off += scnprintf(buf + off, buf_size - off,
   322				"AMD_C2P_MSG2 -\t\t\t%#06x\n", v32);
   323	
   324		v32 = readl(privdata->mmio + AMD_C2P_MSG3);
   325		off += scnprintf(buf + off, buf_size - off,
   326				"AMD_C2P_MSG3 -\t\t\t%#06x\n", v32);
   327	
   328		v32 = readl(privdata->mmio + AMD_C2P_MSG4);
   329		off += scnprintf(buf + off, buf_size - off,
   330				"AMD_C2P_MSG4 -\t\t\t%#06x\n", v32);
   331	
   332		v32 = readl(privdata->mmio + AMD_C2P_MSG5);
   333		off += scnprintf(buf + off, buf_size - off,
   334				"AMD_C2P_MSG5 -\t\t\t%#06x\n", v32);
   335	
   336		v32 = readl(privdata->mmio + AMD_C2P_MSG6);
   337		off += scnprintf(buf + off, buf_size - off,
   338				"AMD_C2P_MSG6 -\t\t\t%#06x\n", v32);
   339	
   340		v32 = readl(privdata->mmio + AMD_C2P_MSG7);
   341		off += scnprintf(buf + off, buf_size - off,
   342				"AMD_C2P_MSG7 -\t\t\t%#06x\n", v32);
   343	
   344		v32 = readl(privdata->mmio + AMD_C2P_MSG8);
   345		off += scnprintf(buf + off, buf_size - off,
   346				"AMD_C2P_MSG8 -\t\t\t%#06x\n", v32);
   347	
   348		v32 = readl(privdata->mmio + AMD_C2P_MSG9);
   349		off += scnprintf(buf + off, buf_size - off,
   350				"AMD_C2P_MSG9 -\t\t\t%#06x\n", v32);
   351	
   352		off += scnprintf(buf + off, buf_size - off,
   353				"\n\tMP2 P2C Message Register Dump:\n\n");
   354	
   355		v32 = readl(privdata->mmio + AMD_P2C_MSG1);
   356		off += scnprintf(buf + off, buf_size - off,
   357				"AMD_P2C_MSG1 -\t\t\t%#06x\n", v32);
   358	
   359		v32 = readl(privdata->mmio + AMD_P2C_MSG2);
   360		off += scnprintf(buf + off, buf_size - off,
   361				"AMD_P2C_MSG2 -\t\t\t%#06x\n", v32);
   362	
   363		v32 = readl(privdata->mmio + AMD_P2C_MSG_INTEN);
   364		off += scnprintf(buf + off, buf_size - off,
   365				"AMD_P2C_MSG_INTEN -\t\t%#06x\n", v32);
   366	
   367		v32 = readl(privdata->mmio + AMD_P2C_MSG_INTSTS);
   368		off += scnprintf(buf + off, buf_size - off,
   369				"AMD_P2C_MSG_INTSTS -\t\t%#06x\n", v32);
   370	
   371		ret = simple_read_from_buffer(ubuf, count, offp, buf, off);
   372		kfree(buf);
   373		return ret;
   374	}
   375	

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