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: xtensa-allyesconfig (attached as .config) compiler: xtensa-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=xtensa 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': arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 182 | ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) | ^~ 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)); | ^~~~~~ arch/xtensa/include/asm/page.h:190:32: note: in expansion of macro 'pfn_valid' 190 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | ^~~~~~~~~ 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/xtensa/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from include/asm-generic/preempt.h:5, from ./arch/xtensa/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': arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 182 | ((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/uapi/linux/swab.h:7, 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/xtensa/include/uapi/asm/byteorder.h:8, from arch/xtensa/include/asm/bitops.h:21, 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': 24 | __asm__("ssai 8 \n\t" | ^~~~~~~ drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:580:6: note: 'pmap' was declared here 580 | u32 pmap; | ^~~~ vim +/pmap +24 arch/xtensa/include/uapi/asm/swab.h 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 19 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 20 static inline __attribute_const__ __u32 __arch_swab32(__u32 x) 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 21 { 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 22 __u32 res; 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 23 /* instruction sequence from Xtensa ISA release 2/2000 */ 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 @24 __asm__("ssai 8 \n\t" 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 25 "srli %0, %1, 16 \n\t" 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 26 "src %0, %0, %1 \n\t" 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 27 "src %0, %0, %0 \n\t" 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 28 "src %0, %1, %0 \n" 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 29 : "=&a" (res) 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 30 : "a" (x) 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 31 ); 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 32 return res; 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 33 } 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 34 #define __arch_swab32 __arch_swab32 8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 35 :::::: The code at line 24 was first introduced by commit :::::: 8903709b054a8dafe4e8c6d9a6444034d7aba36f xtensa: introduce swab.h :::::: TO: Harvey Harrison <harvey.harrison(a)gmail.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org