drivers/media/test-drivers/vidtv/vidtv_psi.c:1778:32: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_eit_event' may result in an unaligned pointer value

[kernel test robot <lkp@intel.com>]

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Hi Daniel,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dbe69e43372212527abf48609aba7fc39a6daa27
commit: 7a7899f6f58e3270ccfd200ee63ebced5ddba3c9 media: vidtv: psi: Implement an Event Information Table (EIT)
date:   7 months ago
config: mips-buildonly-randconfig-r005-20210630 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d21d5472501460933e78aead04cf59579025ba4)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7a7899f6f58e3270ccfd200ee63ebced5ddba3c9
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7a7899f6f58e3270ccfd200ee63ebced5ddba3c9
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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

All warnings (new ones prefixed by >>):

   drivers/media/test-drivers/vidtv/vidtv_psi.c:850:31: warning: taking address of packed member 'bitfield2' of class or structure 'vidtv_psi_table_pmt' may result in an unaligned pointer value [-Waddress-of-packed-member]
           vidtv_psi_set_desc_loop_len(&pmt->bitfield2, desc_loop_len, 10);
                                        ^~~~~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_psi.c:861:32: warning: taking address of packed member 'bitfield2' of class or structure 'vidtv_psi_table_pmt_stream' may result in an unaligned pointer value [-Waddress-of-packed-member]
                   vidtv_psi_set_desc_loop_len(&s->bitfield2, desc_loop_len, 10);
                                                ^~~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_psi.c:893:32: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_sdt_service' may result in an unaligned pointer value [-Waddress-of-packed-member]
                   vidtv_psi_set_desc_loop_len(&s->bitfield, desc_loop_len, 12);
                                                ^~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_psi.c:1556:31: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_nit' may result in an unaligned pointer value [-Waddress-of-packed-member]
           vidtv_psi_set_desc_loop_len(&nit->bitfield, desc_loop_len, 12);
                                        ^~~~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_psi.c:1571:32: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_transport' may result in an unaligned pointer value [-Waddress-of-packed-member]
                   vidtv_psi_set_desc_loop_len(&t->bitfield, desc_loop_len, 12);
                                                ^~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_psi.c:1579:31: warning: taking address of packed member 'bitfield2' of class or structure 'vidtv_psi_table_nit' may result in an unaligned pointer value [-Waddress-of-packed-member]
           vidtv_psi_set_desc_loop_len(&nit->bitfield2, transport_loop_len, 12);
                                        ^~~~~~~~~~~~~~
>> drivers/media/test-drivers/vidtv/vidtv_psi.c:1778:32: warning: taking address of packed member 'bitfield' of class or structure 'vidtv_psi_table_eit_event' may result in an unaligned pointer value [-Waddress-of-packed-member]
                   vidtv_psi_set_desc_loop_len(&e->bitfield, desc_loop_len, 12);
                                                ^~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_psi.c:93:19: warning: unused function 'vidtv_psi_sdt_serv_get_desc_loop_len' [-Wunused-function]
   static inline u16 vidtv_psi_sdt_serv_get_desc_loop_len(struct vidtv_psi_table_sdt_service *s)
                     ^
   drivers/media/test-drivers/vidtv/vidtv_psi.c:104:19: warning: unused function 'vidtv_psi_pmt_stream_get_desc_loop_len' [-Wunused-function]
   static inline u16 vidtv_psi_pmt_stream_get_desc_loop_len(struct vidtv_psi_table_pmt_stream *s)
                     ^
   drivers/media/test-drivers/vidtv/vidtv_psi.c:115:19: warning: unused function 'vidtv_psi_pmt_get_desc_loop_len' [-Wunused-function]
   static inline u16 vidtv_psi_pmt_get_desc_loop_len(struct vidtv_psi_table_pmt *p)
                     ^
   10 warnings generated.
--
>> drivers/media/test-drivers/vidtv/vidtv_channel.c:147:27: warning: taking address of packed member 'descriptor' of class or structure 'vidtv_psi_table_eit_event' may result in an unaligned pointer value [-Waddress-of-packed-member]
                           vidtv_psi_desc_assign(&tail->descriptor, desc);
                                                  ^~~~~~~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_channel.c:192:27: warning: taking address of packed member 'descriptor' of class or structure 'vidtv_psi_table_sdt_service' may result in an unaligned pointer value [-Waddress-of-packed-member]
                           vidtv_psi_desc_assign(&tail->descriptor, desc);
                                                  ^~~~~~~~~~~~~~~~
   drivers/media/test-drivers/vidtv/vidtv_channel.c:292:29: warning: taking address of packed member 'descriptor' of class or structure 'vidtv_psi_table_pmt_stream' may result in an unaligned pointer value [-Waddress-of-packed-member]
                                           vidtv_psi_desc_assign(&tail->descriptor, desc);
                                                                  ^~~~~~~~~~~~~~~~
   3 warnings generated.


vim +1778 drivers/media/test-drivers/vidtv/vidtv_psi.c

  1758	
  1759	void vidtv_psi_eit_table_update_sec_len(struct vidtv_psi_table_eit *eit)
  1760	{
  1761		u16 length = 0;
  1762		struct vidtv_psi_table_eit_event *e = eit->event;
  1763		u16 desc_loop_len;
  1764	
  1765		/*
  1766		 * from immediately after 'section_length' until
  1767		 * 'last_table_id'
  1768		 */
  1769		length += EIT_LEN_UNTIL_LAST_TABLE_ID;
  1770	
  1771		while (e) {
  1772			/* skip both pointers at the end */
  1773			length += sizeof(struct vidtv_psi_table_eit_event) -
  1774				  sizeof(struct vidtv_psi_desc *) -
  1775				  sizeof(struct vidtv_psi_table_eit_event *);
  1776	
  1777			desc_loop_len = vidtv_psi_desc_comp_loop_len(e->descriptor);
> 1778			vidtv_psi_set_desc_loop_len(&e->bitfield, desc_loop_len, 12);
  1779	
  1780			length += desc_loop_len;
  1781	
  1782			e = e->next;
  1783		}
  1784	
  1785		length += CRC_SIZE_IN_BYTES;
  1786	
  1787		vidtv_psi_set_sec_len(&eit->header, length);
  1788	}
  1789	

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

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