linux-kernel - drivers/hid/hid-ft260.c:879:1: warning: taking address of packed member 'clock' of class or structure 'ft260_get_i2c_status_report' may result in an unaligned pointer value

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Date:   Sun, 12 Sep 2021 00:50:36 +0800
From:   kernel test robot <lkp@...el.com>
To:     Michael Zaidman <michael.zaidman@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Jiri Kosina <jkosina@...e.cz>
Subject: drivers/hid/hid-ft260.c:879:1: warning: taking address of packed
 member 'clock' of class or structure 'ft260_get_i2c_status_report' may
 result in an unaligned pointer value

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   926de8c4326c14fcf35f1de142019043597a4fac
commit: 6a82582d9fa438045191074856f47165334f2777 HID: ft260: add usb hid to i2c host bridge driver
date:   6 months ago
config: i386-randconfig-a015-20210911 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6a82582d9fa438045191074856f47165334f2777
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6a82582d9fa438045191074856f47165334f2777
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 

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 >>):

   clang-14: warning: optimization flag '-falign-jumps=0' is not supported [-Wignored-optimization-argument]
   In file included from drivers/hid/hid-ft260.c:12:
   In file included from include/linux/hidraw.h:8:
   In file included from include/uapi/linux/hidraw.h:19:
   In file included from include/linux/hid.h:19:
   In file included from include/linux/slab.h:15:
   In file included from include/linux/gfp.h:6:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:51:
   In file included from include/linux/preempt.h:78:
   In file included from arch/x86/include/asm/preempt.h:7:
   In file included from include/linux/thread_info.h:58:
   arch/x86/include/asm/thread_info.h:172:13: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
           oldframe = __builtin_frame_address(1);
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/thread_info.h:174:11: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
                   frame = __builtin_frame_address(2);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/hid/hid-ft260.c:515:59: warning: variable 'len' is uninitialized when used here [-Wuninitialized]
                   hid_err(hdev, "%s: unsupported wr len: %d\n", __func__, len);
                                                                           ^~~
   include/linux/hid.h:1190:30: note: expanded from macro 'hid_err'
           dev_err(&(hid)->dev, fmt, ##__VA_ARGS__)
                                       ^~~~~~~~~~~
   include/linux/dev_printk.h:112:32: note: expanded from macro 'dev_err'
           _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
                                         ^~~~~~~~~~~
   drivers/hid/hid-ft260.c:507:9: note: initialize the variable 'len' to silence this warning
           int len, ret;
                  ^
                   = 0
>> drivers/hid/hid-ft260.c:879:1: warning: taking address of packed member 'clock' of class or structure 'ft260_get_i2c_status_report' may result in an unaligned pointer value [-Waddress-of-packed-member]
   FT260_I2CST_ATTR_SHOW(clock);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/hid/hid-ft260.c:814:3: note: expanded from macro 'FT260_I2CST_ATTR_SHOW'
                   FT260_ATTR_SHOW(name, ft260_get_i2c_status_report,             \
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/hid/hid-ft260.c:803:18: note: expanded from macro 'FT260_ATTR_SHOW'
                   type *field = &rep.name;                                       \
                                  ^~~~~~~~
   4 warnings generated.


vim +879 drivers/hid/hid-ft260.c

   878	
 > 879	FT260_I2CST_ATTR_SHOW(clock);
   880	FT260_WORD_ATTR_STORE(clock, ft260_set_i2c_speed_report,
   881			      FT260_SET_I2C_CLOCK_SPEED);
   882	static DEVICE_ATTR_RW(clock);
   883	

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

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