drivers/net/dsa/yt921x.c:1601:9: error: call to '__compiletime_assert_831' declared with 'error' attribute: FIELD_PREP: value too large for the field

:::::: 
:::::: Manual check reason: "__compiletime_assert_NNN"
:::::: 

BCC: [email protected]
CC: [email protected]
CC: [email protected]
TO: David Yang <[email protected]>
CC: Jakub Kicinski <[email protected]>

Hi David,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fce2dfa773ced15f27dd27cd0b482a7473cdcf2a
commit: 186623f4aa724c46cbb4dbd5235cf6942215f5b5 net: dsa: yt921x: Add support for Motorcomm YT921x
date:   9 months ago
:::::: branch date: 12 hours ago
:::::: commit date: 9 months ago
config: um-randconfig-r134-20260717 (https://download.01.org/0day-ci/archive/20260717/[email protected]/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260717/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Fixes: 186623f4aa72 ("net: dsa: yt921x: Add support for Motorcomm YT921x")
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/r/[email protected]/

All errors (new ones prefixed by >>):

   In file included from drivers/net/dsa/yt921x.c:11:
   In file included from include/linux/etherdevice.h:20:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:17:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/um/include/asm/hardirq.h:5:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:12:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1209 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
>> drivers/net/dsa/yt921x.c:1601:9: error: call to '__compiletime_assert_831' declared with 'error' attribute: FIELD_PREP: value too large for the field
    1601 |         ctrl = YT921X_PORT_VLAN_CTRL_CVID(vid);
         |                ^
   drivers/net/dsa/yt921x.h:363:43: note: expanded from macro 'YT921X_PORT_VLAN_CTRL_CVID'
     363 | #define   YT921X_PORT_VLAN_CTRL_CVID(x)                 FIELD_PREP(YT921X_PORT_VLAN_CTRL_CVID_M, (x))
         |                                                         ^
   include/linux/bitfield.h:115:3: note: expanded from macro 'FIELD_PREP'
     115 |                 __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");    \
         |                 ^
   include/linux/bitfield.h:68:3: note: expanded from macro '__BF_FIELD_CHECK'
      68 |                 BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?           \
         |                 ^
   note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:585:2: note: expanded from macro '_compiletime_assert'
     585 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^
   include/linux/compiler_types.h:578:4: note: expanded from macro '__compiletime_assert'
     578 |                         prefix ## suffix();                             \
         |                         ^
   <scratch space>:46:1: note: expanded from here
      46 | __compiletime_assert_831
         | ^
   1 warning and 1 error generated.


vim +1601 drivers/net/dsa/yt921x.c

186623f4aa724c David Yang 2025-10-17  1593  
186623f4aa724c David Yang 2025-10-17  1594  static int
186623f4aa724c David Yang 2025-10-17  1595  yt921x_port_set_pvid(struct yt921x_priv *priv, int port, u16 vid)
186623f4aa724c David Yang 2025-10-17  1596  {
186623f4aa724c David Yang 2025-10-17  1597  	u32 mask;
186623f4aa724c David Yang 2025-10-17  1598  	u32 ctrl;
186623f4aa724c David Yang 2025-10-17  1599  
186623f4aa724c David Yang 2025-10-17  1600  	mask = YT921X_PORT_VLAN_CTRL_CVID_M;
186623f4aa724c David Yang 2025-10-17 @1601  	ctrl = YT921X_PORT_VLAN_CTRL_CVID(vid);
186623f4aa724c David Yang 2025-10-17  1602  	return yt921x_reg_update_bits(priv, YT921X_PORTn_VLAN_CTRL(port),
186623f4aa724c David Yang 2025-10-17  1603  				      mask, ctrl);
186623f4aa724c David Yang 2025-10-17  1604  }
186623f4aa724c David Yang 2025-10-17  1605  

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki