Hi Andrey, [auto build test ERROR on linus/master] [also build test ERROR on v4.14-rc1 next-20170921] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Andrey-Ryabinin/kcov-remove-ifdef-CONFIG_RANDOMIZE_BASE/20170922-035755 config: s390-allmodconfig (attached as .config) compiler: s390x-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=s390 All errors (new ones prefixed by >>): kernel/kcov.c: In function '__sanitizer_cov_trace_pc': >> kernel/kcov.c:72:9: error: implicit declaration of function 'kaslr_offset' >> [-Werror=implicit-function-declaration] ip -= kaslr_offset(); ^~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/kaslr_offset +72 kernel/kcov.c 5c9a8750 Dmitry Vyukov 2016-03-22 49 5c9a8750 Dmitry Vyukov 2016-03-22 50 /* 5c9a8750 Dmitry Vyukov 2016-03-22 51 * Entry point from instrumented code. 5c9a8750 Dmitry Vyukov 2016-03-22 52 * This is called once per basic-block/edge. 5c9a8750 Dmitry Vyukov 2016-03-22 53 */ bdab42df James Morse 2016-04-28 54 void notrace __sanitizer_cov_trace_pc(void) 5c9a8750 Dmitry Vyukov 2016-03-22 55 { 5c9a8750 Dmitry Vyukov 2016-03-22 56 struct task_struct *t; 5c9a8750 Dmitry Vyukov 2016-03-22 57 enum kcov_mode mode; 5c9a8750 Dmitry Vyukov 2016-03-22 58 5c9a8750 Dmitry Vyukov 2016-03-22 59 t = current; 5c9a8750 Dmitry Vyukov 2016-03-22 60 /* 5c9a8750 Dmitry Vyukov 2016-03-22 61 * We are interested in code coverage as a function of a syscall inputs, 5c9a8750 Dmitry Vyukov 2016-03-22 62 * so we ignore code executed in interrupts. 5c9a8750 Dmitry Vyukov 2016-03-22 63 */ f61e869d Dmitry Vyukov 2017-05-08 64 if (!t || !in_task()) 5c9a8750 Dmitry Vyukov 2016-03-22 65 return; 5c9a8750 Dmitry Vyukov 2016-03-22 66 mode = READ_ONCE(t->kcov_mode); 5c9a8750 Dmitry Vyukov 2016-03-22 67 if (mode == KCOV_MODE_TRACE) { 5c9a8750 Dmitry Vyukov 2016-03-22 68 unsigned long *area; 5c9a8750 Dmitry Vyukov 2016-03-22 69 unsigned long pos; 4983f0ab Alexander Popov 2016-12-19 70 unsigned long ip = _RET_IP_; 4983f0ab Alexander Popov 2016-12-19 71 4983f0ab Alexander Popov 2016-12-19 @72 ip -= kaslr_offset(); 5c9a8750 Dmitry Vyukov 2016-03-22 73 5c9a8750 Dmitry Vyukov 2016-03-22 74 /* 5c9a8750 Dmitry Vyukov 2016-03-22 75 * There is some code that runs in interrupts but for which 5c9a8750 Dmitry Vyukov 2016-03-22 76 * in_interrupt() returns false (e.g. preempt_schedule_irq()). 5c9a8750 Dmitry Vyukov 2016-03-22 77 * READ_ONCE()/barrier() effectively provides load-acquire wrt 5c9a8750 Dmitry Vyukov 2016-03-22 78 * interrupts, there are paired barrier()/WRITE_ONCE() in 5c9a8750 Dmitry Vyukov 2016-03-22 79 * kcov_ioctl_locked(). 5c9a8750 Dmitry Vyukov 2016-03-22 80 */ 5c9a8750 Dmitry Vyukov 2016-03-22 81 barrier(); 5c9a8750 Dmitry Vyukov 2016-03-22 82 area = t->kcov_area; 5c9a8750 Dmitry Vyukov 2016-03-22 83 /* The first word is number of subsequent PCs. */ 5c9a8750 Dmitry Vyukov 2016-03-22 84 pos = READ_ONCE(area[0]) + 1; 5c9a8750 Dmitry Vyukov 2016-03-22 85 if (likely(pos < t->kcov_size)) { 4983f0ab Alexander Popov 2016-12-19 86 area[pos] = ip; 5c9a8750 Dmitry Vyukov 2016-03-22 87 WRITE_ONCE(area[0], pos); 5c9a8750 Dmitry Vyukov 2016-03-22 88 } 5c9a8750 Dmitry Vyukov 2016-03-22 89 } 5c9a8750 Dmitry Vyukov 2016-03-22 90 } 5c9a8750 Dmitry Vyukov 2016-03-22 91 EXPORT_SYMBOL(__sanitizer_cov_trace_pc); 5c9a8750 Dmitry Vyukov 2016-03-22 92 :::::: The code at line 72 was first introduced by commit :::::: 4983f0ab7ffaad1e534b21975367429736475205 kcov: make kcov work properly with KASLR enabled :::::: TO: Alexander Popov <alex.po...@linux.com> :::::: CC: Linus Torvalds <torva...@linux-foundation.org> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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