tree: https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel head: 71914a457c7d0ccd85e22ceda42254432f1dbc10 commit: 4782bd74de97c016793ba05b6fd51a4a881ce046 [65/69] linkage: perform symbol pair checking (per group) config: arc-defconfig (attached as .config) compiler: arc-elf-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 git checkout 4782bd74de97c016793ba05b6fd51a4a881ce046 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): arch/arc/kernel/entry-arcv2.S: Assembler messages: arch/arc/kernel/entry-arcv2.S:99: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry-arcv2.S:105: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry-arcv2.S:111: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry-arcv2.S:123: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry-arcv2.S:136: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry-arcv2.S:161: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:26: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:38: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:50: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:79: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:96: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:131: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:147: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:235: Error: junk at end of line, first unrecognized character is `h' arch/arc/kernel/entry.S:277: Error: junk at end of line, first unrecognized character is `h' vim +68 arch/arc/kernel/entry-arcv2.S 1f6ccfff631467 Vineet Gupta 2013-05-13 67 1f6ccfff631467 Vineet Gupta 2013-05-13 @68 ENTRY(handle_interrupt) 1f6ccfff631467 Vineet Gupta 2013-05-13 69 a4880801a72ecc Vineet Gupta 2019-05-15 70 INTERRUPT_PROLOGUE 1f6ccfff631467 Vineet Gupta 2013-05-13 71 78833e79d51690 Vineet Gupta 2016-09-23 72 # irq control APIs local_irq_save/restore/disable/enable fiddle with 78833e79d51690 Vineet Gupta 2016-09-23 73 # global interrupt enable bits in STATUS32 (.IE for 1 prio, .E[] for 2 prio) 78833e79d51690 Vineet Gupta 2016-09-23 74 # However a taken interrupt doesn't clear these bits. Thus irqs_disabled() 78833e79d51690 Vineet Gupta 2016-09-23 75 # query in hard ISR path would return false (since .IE is set) which would 78833e79d51690 Vineet Gupta 2016-09-23 76 # trips genirq interrupt handling asserts. 78833e79d51690 Vineet Gupta 2016-09-23 77 # 78833e79d51690 Vineet Gupta 2016-09-23 78 # So do a "soft" disable of interrutps here. 78833e79d51690 Vineet Gupta 2016-09-23 79 # 78833e79d51690 Vineet Gupta 2016-09-23 80 # Note this disable is only for consistent book-keeping as further interrupts 78833e79d51690 Vineet Gupta 2016-09-23 81 # will be disabled anyways even w/o this. Hardware tracks active interrupts 75370ad44075e8 Vineet Gupta 2019-05-22 82 # seperately in AUX_IRQ_ACT.active and will not take new interrupts 78833e79d51690 Vineet Gupta 2016-09-23 83 # unless this one returns (or higher prio becomes pending in 2-prio scheme) 78833e79d51690 Vineet Gupta 2016-09-23 84 78833e79d51690 Vineet Gupta 2016-09-23 85 IRQ_DISABLE 78833e79d51690 Vineet Gupta 2016-09-23 86 78833e79d51690 Vineet Gupta 2016-09-23 87 ; icause is banked: one per priority level 78833e79d51690 Vineet Gupta 2016-09-23 88 ; so a higher prio interrupt taken here won't clobber prev prio icause d9676fa152c83b Evgeny Voevodin 2016-03-23 89 lr r0, [ICAUSE] 1f6ccfff631467 Vineet Gupta 2013-05-13 90 mov blink, ret_from_exception 1f6ccfff631467 Vineet Gupta 2013-05-13 91 1f6ccfff631467 Vineet Gupta 2013-05-13 92 b.d arch_do_IRQ 1f6ccfff631467 Vineet Gupta 2013-05-13 93 mov r1, sp 1f6ccfff631467 Vineet Gupta 2013-05-13 94 :::::: The code at line 68 was first introduced by commit :::::: 1f6ccfff6314672743ad7252160654709e997a2a ARCv2: Support for ARCv2 ISA and HS38x cores :::::: TO: Vineet Gupta <vgupta(a)synopsys.com&gt; :::::: CC: Vineet Gupta <vgupta(a)synopsys.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org