Hi Prasad, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/timers/core] [also build test WARNING on tip/auto-latest tip/timers/nohz v5.6-rc6 next-20200316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Prasad-Sodagudi/timer-make-defer... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git d441dceb5dce71150f28add80d36d91bbfccba99 config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 9.2.0 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 GCC_VERSION=9.2.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): kernel/time/timer.c: In function 'get_timer_cpu_base': kernel/time/timer.c:848:11: error: 'timer_base_deferrable' undeclared (first use in this function) 848 | base = &timer_base_deferrable; | ^~~~~~~~~~~~~~~~~~~~~ kernel/time/timer.c:848:11: note: each undeclared identifier is reported only once for each function it appears in kernel/time/timer.c: In function 'get_timer_this_cpu_base': kernel/time/timer.c:867:11: error: 'timer_base_deferrable' undeclared (first use in this function) 867 | base = &timer_base_deferrable; | ^~~~~~~~~~~~~~~~~~~~~ In file included from arch/ia64/include/uapi/asm/intrinsics.h:22, from arch/ia64/include/asm/intrinsics.h:11, from arch/ia64/include/asm/bitops.h:19, from include/linux/bitops.h:29, from include/linux/kernel.h:12, from include/linux/list.h:9, from include/linux/smp.h:12, from include/linux/kernel_stat.h:5, from kernel/time/timer.c:21: kernel/time/timer.c: In function 'run_timer_softirq': kernel/time/timer.c:1828:24: error: 'deferrable_pending' undeclared (first use in this function) 1828 | if ((atomic_cmpxchg(&deferrable_pending, 1, 0) && | ^~~~~~~~~~~~~~~~~~ arch/ia64/include/uapi/asm/cmpxchg.h:75:10: note: in definition of macro 'ia64_cmpxchg' 75 | switch (size) { \ | ^~~~ 130 | #define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) | ^~~~~~~~~~~ 211 | #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) | ^~~~~~~ kernel/time/timer.c:1828:8: note: in expansion of macro 'atomic_cmpxchg' 1828 | if ((atomic_cmpxchg(&deferrable_pending, 1, 0) && | ^~~~~~~~~~~~~~ kernel/time/timer.c:1829:5: error: 'tick_do_timer_cpu' undeclared (first use in this function); did you mean 'tick_dep_clear_cpu'? 1829 | tick_do_timer_cpu == TICK_DO_TIMER_NONE) || | ^~~~~~~~~~~~~~~~~ | tick_dep_clear_cpu kernel/time/timer.c:1829:26: error: 'TICK_DO_TIMER_NONE' undeclared (first use in this function) 1829 | tick_do_timer_cpu == TICK_DO_TIMER_NONE) || | ^~~~~~~~~~~~~~~~~~ kernel/time/timer.c:1831:18: error: 'timer_base_deferrable' undeclared (first use in this function) 1831 | __run_timers(&timer_base_deferrable); | ^~~~~~~~~~~~~~~~~~~~~ kernel/time/timer.c: In function 'init_timer_deferrable_global': kernel/time/timer.c:2073:2: error: 'timer_base_deferrable' undeclared (first use in this function) 2073 | timer_base_deferrable.cpu = nr_cpu_ids; | ^~~~~~~~~~~~~~~~~~~~~ -- kernel//time/timer.c: In function 'get_timer_cpu_base': kernel//time/timer.c:848:11: error: 'timer_base_deferrable' undeclared (first use in this function) 848 | base = &timer_base_deferrable; | ^~~~~~~~~~~~~~~~~~~~~ kernel//time/timer.c:848:11: note: each undeclared identifier is reported only once for each function it appears in kernel//time/timer.c: In function 'get_timer_this_cpu_base': kernel//time/timer.c:867:11: error: 'timer_base_deferrable' undeclared (first use in this function) 867 | base = &timer_base_deferrable; | ^~~~~~~~~~~~~~~~~~~~~ In file included from arch/ia64/include/uapi/asm/intrinsics.h:22, from arch/ia64/include/asm/intrinsics.h:11, from arch/ia64/include/asm/bitops.h:19, from include/linux/bitops.h:29, from include/linux/kernel.h:12, from include/linux/list.h:9, from include/linux/smp.h:12, from include/linux/kernel_stat.h:5, from kernel//time/timer.c:21: kernel//time/timer.c: In function 'run_timer_softirq': kernel//time/timer.c:1828:24: error: 'deferrable_pending' undeclared (first use in this function) 1828 | if ((atomic_cmpxchg(&deferrable_pending, 1, 0) && | ^~~~~~~~~~~~~~~~~~ arch/ia64/include/uapi/asm/cmpxchg.h:75:10: note: in definition of macro 'ia64_cmpxchg' 75 | switch (size) { \ | ^~~~ 130 | #define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) | ^~~~~~~~~~~ 211 | #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) | ^~~~~~~ kernel//time/timer.c:1828:8: note: in expansion of macro 'atomic_cmpxchg' 1828 | if ((atomic_cmpxchg(&deferrable_pending, 1, 0) && | ^~~~~~~~~~~~~~ kernel//time/timer.c:1829:5: error: 'tick_do_timer_cpu' undeclared (first use in this function); did you mean 'tick_dep_clear_cpu'? 1829 | tick_do_timer_cpu == TICK_DO_TIMER_NONE) || | ^~~~~~~~~~~~~~~~~ | tick_dep_clear_cpu kernel//time/timer.c:1829:26: error: 'TICK_DO_TIMER_NONE' undeclared (first use in this function) 1829 | tick_do_timer_cpu == TICK_DO_TIMER_NONE) || | ^~~~~~~~~~~~~~~~~~ kernel//time/timer.c:1831:18: error: 'timer_base_deferrable' undeclared (first use in this function) 1831 | __run_timers(&timer_base_deferrable); | ^~~~~~~~~~~~~~~~~~~~~ kernel//time/timer.c: In function 'init_timer_deferrable_global': kernel//time/timer.c:2073:2: error: 'timer_base_deferrable' undeclared (first use in this function) 2073 | timer_base_deferrable.cpu = nr_cpu_ids; | ^~~~~~~~~~~~~~~~~~~~~ vim +/cmpxchg_acq +130 arch/ia64/include/uapi/asm/cmpxchg.h 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 114 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 115 #define cmpxchg_acq(ptr, o, n) \ 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 116 ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr))) 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 117 #define cmpxchg_rel(ptr, o, n) \ 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 118 ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr))) 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 119 e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 120 /* e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 121 * Worse still - early processor implementations actually just ignored e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 122 * the acquire/release and did a full fence all the time. Unfortunately e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 123 * this meant a lot of badly written code that used .acq when they really e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 124 * wanted .rel became legacy out in the wild - so when we made a cpu e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 125 * that strictly did the .acq or .rel ... all that code started breaking - so e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 126 * we had to back-pedal and keep the "legacy" behavior of a full fence :-( e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 127 */ e4f9bfb3feaeac arch/ia64/include/uapi/asm/cmpxchg.h Peter Zijlstra 2014-02-04 128 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 129 /* for compatibility with other platforms: */ 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 @130 #define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 131 #define cmpxchg64(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) 85f8f7759e418c arch/ia64/include/asm/cmpxchg.h Paul Gortmaker 2012-04-03 132 :::::: The code at line 130 was first introduced by commit :::::: 85f8f7759e418c814ee2ceacf73eddb9bed39492 ia64: populate the cmpxchg header with appropriate code :::::: TO: Paul Gortmaker <paul.gortmaker(a)windriver.com&gt; :::::: CC: Paul Gortmaker <paul.gortmaker(a)windriver.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org