linux-kernel - Re: [PATCH] add support for battery charging threshold, mute. correctly save ac/dc brightness to hardware registers

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Message-ID: <202008200605.MzwZ4Tgt%lkp@intel.com>
Date:   Thu, 20 Aug 2020 06:31:38 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kenneth Chan <kenneth.t.chan@...il.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        laforge@...monks.org, Kenneth Chan <kenneth.t.chan@...il.com>
Subject: Re: [PATCH] add support for battery charging threshold, mute.
 correctly save ac/dc brightness to hardware registers

Hi Kenneth,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on linus/master v5.9-rc1 next-20200819]
[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]

url:    https://github.com/0day-ci/linux/commits/Kenneth-Chan/add-support-for-battery-charging-threshold-mute-correctly-save-ac-dc-brightness-to-hardware-registers/20200819-020600
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git bcf876870b95592b52519ed4aafcf9d95999bc9c
config: x86_64-randconfig-a014-20200819 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b34b1e38381fa4d1b1d9751a6b5233b68e734cfe)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/platform/x86/panasonic-laptop.c:667:15: warning: overlapping comparisons always evaluate to true [-Wtautological-overlap-compare]
           if (val >= 0 || val <= 255) {
               ~~~~~~~~~^~~~~~~~~~~~~
   drivers/platform/x86/panasonic-laptop.c:697:15: warning: overlapping comparisons always evaluate to true [-Wtautological-overlap-compare]
           if (val >= 0 || val <= 255) {
               ~~~~~~~~~^~~~~~~~~~~~~
   drivers/platform/x86/panasonic-laptop.c:728:15: warning: overlapping comparisons always evaluate to true [-Wtautological-overlap-compare]
           if (val >= 0 || val <= 255) {
               ~~~~~~~~~^~~~~~~~~~~~~
   3 warnings generated.

# https://github.com/0day-ci/linux/commit/1f9eb2351cf22424f1ca39f5068c51fe74189aba
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Kenneth-Chan/add-support-for-battery-charging-threshold-mute-correctly-save-ac-dc-brightness-to-hardware-registers/20200819-020600
git checkout 1f9eb2351cf22424f1ca39f5068c51fe74189aba
vim +667 drivers/platform/x86/panasonic-laptop.c

   656	
   657	static ssize_t ac_brightness_store(struct device *dev, struct device_attribute *attr,
   658				  const char *buf, size_t count)
   659	{
   660		struct acpi_device *acpi = to_acpi_device(dev);
   661		struct pcc_acpi *pcc = acpi_driver_data(acpi);
   662		int err, val;
   663	
   664		err = kstrtoint(buf, 0, &val);
   665		if (err)
   666			return err;
 > 667		if (val >= 0 || val <= 255) {
   668			acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, val);
   669			pcc->ac_brightness = val;
   670		}
   671	
   672		return count;
   673	}
   674	

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

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