tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4 head: 629150468791671b5fde21363e643e87c5815b17 commit: bbcf6f9bb1bc206330ca4d423e5a3966d8d82110 [1102/1697] net: xilinx: Add support for PL TSN IP features config: h8300-allyesconfig (attached as .config) compiler: h8300-linux-gcc (GCC) 9.3.0 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://github.com/Xilinx/linux-xlnx/commit/bbcf6f9bb1bc206330ca4d423e5a3... git remote add xlnx https://github.com/Xilinx/linux-xlnx git fetch --no-tags xlnx xlnx_rebase_v5.4 git checkout bbcf6f9bb1bc206330ca4d423e5a3966d8d82110 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): In file included from include/linux/kernel.h:11, from include/linux/list.h:9, from include/linux/timer.h:5, from include/linux/netdevice.h:24, from drivers/net/ethernet/xilinx/xilinx_axienet.h:12, from drivers/net/ethernet/xilinx/xilinx_tsn_switch.h:21, from drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:18: include/linux/scatterlist.h: In function 'sg_set_buf': include/asm-generic/page.h:93:50: warning: ordered comparison of pointer with null pointer [-Wextra] 93 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ | ^~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~ include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~~~~~~~~~~ In file included from arch/h8300/include/asm/bug.h:8, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/h8300/include/generated/asm/preempt.h:1, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from include/linux/seqlock.h:36, from include/linux/time.h:6, from include/linux/ktime.h:24, from include/linux/timer.h:6, from include/linux/netdevice.h:24, from drivers/net/ethernet/xilinx/xilinx_axienet.h:12, from drivers/net/ethernet/xilinx/xilinx_tsn_switch.h:21, from drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:18: include/linux/dma-mapping.h: In function 'dma_map_resource': include/asm-generic/page.h:91:32: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 91 | #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) | ^~ include/asm-generic/bug.h:139:27: note: in definition of macro 'WARN_ON_ONCE' 139 | int __ret_warn_once = !!(condition); \ | ^~~~~~~~~ include/linux/dma-mapping.h:355:19: note: in expansion of macro 'pfn_valid' 355 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr)))) | ^~~~~~~~~ In file included from include/linux/swab.h:5, from include/uapi/linux/byteorder/big_endian.h:13, from include/linux/byteorder/big_endian.h:5, from arch/h8300/include/asm/byteorder.h:5, from include/asm-generic/bitops/le.h:6, from arch/h8300/include/asm/bitops.h:171, from include/linux/bitops.h:26, from include/linux/kernel.h:12, from include/linux/list.h:9, from include/linux/timer.h:5, from include/linux/netdevice.h:24, from drivers/net/ethernet/xilinx/xilinx_axienet.h:12, from drivers/net/ethernet/xilinx/xilinx_tsn_switch.h:21, from drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:18: drivers/net/ethernet/xilinx/xilinx_tsn_switch.c: In function 'tsnswitch_probe': 20 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ | ^~ drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:580:6: note: 'pmap' was declared here 580 | u32 pmap; | ^~~~ vim +/pmap +20 include/uapi/linux/swab.h 607ca46e97a1b659 David Howells 2012-10-13 8 607ca46e97a1b659 David Howells 2012-10-13 9 /* 607ca46e97a1b659 David Howells 2012-10-13 10 * casts are necessary for constants, because we never know how for sure 607ca46e97a1b659 David Howells 2012-10-13 11 * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. 607ca46e97a1b659 David Howells 2012-10-13 12 */ 607ca46e97a1b659 David Howells 2012-10-13 13 #define ___constant_swab16(x) ((__u16)( \ 607ca46e97a1b659 David Howells 2012-10-13 14 (((__u16)(x) & (__u16)0x00ffU) << 8) | \ 607ca46e97a1b659 David Howells 2012-10-13 15 (((__u16)(x) & (__u16)0xff00U) >> 8))) 607ca46e97a1b659 David Howells 2012-10-13 16 607ca46e97a1b659 David Howells 2012-10-13 17 #define ___constant_swab32(x) ((__u32)( \ 607ca46e97a1b659 David Howells 2012-10-13 18 (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ 607ca46e97a1b659 David Howells 2012-10-13 19 (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ 607ca46e97a1b659 David Howells 2012-10-13 @20 (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ 607ca46e97a1b659 David Howells 2012-10-13 21 (((__u32)(x) & (__u32)0xff000000UL) >> 24))) 607ca46e97a1b659 David Howells 2012-10-13 22 :::::: The code at line 20 was first introduced by commit :::::: 607ca46e97a1b6594b29647d98a32d545c24bdff UAPI: (Scripted) Disintegrate include/linux :::::: TO: David Howells <dhowells(a)redhat.com&gt; :::::: CC: David Howells <dhowells(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org