Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/sched/core] [also build test WARNING on v5.10-rc7 next-20201209] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/carver4lio-163-com/sched-rt-fix-... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 21bf7cbd1b100758cc82f5340576028d3d83119b config: mips-randconfig-r026-20201209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1968804ac726e7674d5de22bc2204b45857da344) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/0day-ci/linux/commit/65b78641992cb9b9ae024d4b9ee02822a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review carver4lio-163-com/sched-rt-fix-the-missing-of-rt_rq-runtime-check-in-rt-period-timer/20201205-142057 git checkout 65b78641992cb9b9ae024d4b9ee02822a7d45167 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): kernel/sched/rt.c:669:6: warning: no previous prototype for function 'sched_rt_bandwidth_account' bool sched_rt_bandwidth_account(struct rt_rq ^ kernel/sched/rt.c:669:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool sched_rt_bandwidth_account(struct rt_rq ^ static static inline const struct cpumask ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/bitops.h", .line = 105, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 or $0, $2 sc $0, $1 beqz $0, 1b .set pop ' clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 12.0.0 (git://gitmirror/llvm_project 1968804ac726e7674d5de22bc2204b45857da344) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-1968804ac7/bin clang-12: note: diagnostic msg: Makefile arch drivers include kernel scripts source usr vim +/sched_rt_period_mask +583 kernel/sched/rt.c 23b0fdfc9299b1 kernel/sched_rt.c Peter Zijlstra 2008-02-13 581 d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 582 #ifdef CONFIG_SMP c6c4927b22a351 kernel/sched_rt.c Rusty Russell 2008-11-25 @583 static inline const struct cpumask *sched_rt_period_mask(void) d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 584 { 424c93fe4cbe71 kernel/sched/rt.c Nathan Zimmer 2013-05-09 585 return this_rq()->rd->span; d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 586 } 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 587 #else c6c4927b22a351 kernel/sched_rt.c Rusty Russell 2008-11-25 588 static inline const struct cpumask *sched_rt_period_mask(void) d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 589 { c6c4927b22a351 kernel/sched_rt.c Rusty Russell 2008-11-25 590 return cpu_online_mask; d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 591 } d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 592 #endif 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 593 d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 594 static inline d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 595 struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu) 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 596 { d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 597 return container_of(rt_b, struct task_group, rt_bandwidth)->rt_rq[cpu]; d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 598 } d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 599 ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 600 static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq) ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 601 { ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 602 return &rt_rq->tg->rt_bandwidth; ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 603 } ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 604 55e12e5e7b1d7e kernel/sched_rt.c Dhaval Giani 2008-06-24 605 #else /* !CONFIG_RT_GROUP_SCHED */ 9f0c1e560c4332 kernel/sched_rt.c Peter Zijlstra 2008-02-13 606 d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 607 static inline u64 sched_rt_runtime(struct rt_rq *rt_rq) d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 608 { ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 609 return rt_rq->rt_runtime; ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 610 } ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 611 ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 612 static inline u64 sched_rt_period(struct rt_rq *rt_rq) ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 613 { ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 614 return ktime_to_ns(def_rt_bandwidth.rt_period); 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 615 } 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 616 ec514c487c3d4b kernel/sched_rt.c Cheng Xu 2011-05-14 617 typedef struct rt_rq *rt_rq_iter_t; ec514c487c3d4b kernel/sched_rt.c Cheng Xu 2011-05-14 618 ec514c487c3d4b kernel/sched_rt.c Cheng Xu 2011-05-14 619 #define for_each_rt_rq(rt_rq, iter, rq) \ ec514c487c3d4b kernel/sched_rt.c Cheng Xu 2011-05-14 620 for ((void) iter, rt_rq = &rq->rt; rt_rq; rt_rq = NULL) ec514c487c3d4b kernel/sched_rt.c Cheng Xu 2011-05-14 621 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 622 #define for_each_sched_rt_entity(rt_se) \ 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 623 for (; rt_se; rt_se = NULL) 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 624 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 625 static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se) 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 626 { 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 627 return NULL; 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 628 } 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 629 9f0c1e560c4332 kernel/sched_rt.c Peter Zijlstra 2008-02-13 630 static inline void sched_rt_rq_enqueue(struct rt_rq *rt_rq) 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 631 { f4ebcbc0d7e009 kernel/sched/rt.c Kirill Tkhai 2014-03-15 632 struct rq *rq = rq_of_rt_rq(rt_rq); f4ebcbc0d7e009 kernel/sched/rt.c Kirill Tkhai 2014-03-15 633 f4ebcbc0d7e009 kernel/sched/rt.c Kirill Tkhai 2014-03-15 634 if (!rt_rq->rt_nr_running) f4ebcbc0d7e009 kernel/sched/rt.c Kirill Tkhai 2014-03-15 635 return; f4ebcbc0d7e009 kernel/sched/rt.c Kirill Tkhai 2014-03-15 636 f4ebcbc0d7e009 kernel/sched/rt.c Kirill Tkhai 2014-03-15 637 enqueue_top_rt_rq(rt_rq); 8875125efe8402 kernel/sched/rt.c Kirill Tkhai 2014-06-29 638 resched_curr(rq); 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 639 } 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 640 9f0c1e560c4332 kernel/sched_rt.c Peter Zijlstra 2008-02-13 641 static inline void sched_rt_rq_dequeue(struct rt_rq *rt_rq) 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 642 { f4ebcbc0d7e009 kernel/sched/rt.c Kirill Tkhai 2014-03-15 643 dequeue_top_rt_rq(rt_rq); 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 644 } 6f505b16425a51 kernel/sched_rt.c Peter Zijlstra 2008-01-25 645 46383648b3c769 kernel/sched/rt.c Kirill Tkhai 2014-03-15 646 static inline int rt_rq_throttled(struct rt_rq *rt_rq) 46383648b3c769 kernel/sched/rt.c Kirill Tkhai 2014-03-15 647 { 46383648b3c769 kernel/sched/rt.c Kirill Tkhai 2014-03-15 648 return rt_rq->rt_throttled; 46383648b3c769 kernel/sched/rt.c Kirill Tkhai 2014-03-15 649 } 46383648b3c769 kernel/sched/rt.c Kirill Tkhai 2014-03-15 650 c6c4927b22a351 kernel/sched_rt.c Rusty Russell 2008-11-25 651 static inline const struct cpumask *sched_rt_period_mask(void) d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 652 { c6c4927b22a351 kernel/sched_rt.c Rusty Russell 2008-11-25 653 return cpu_online_mask; d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 654 } d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 655 d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 656 static inline d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 657 struct rt_rq *sched_rt_period_rt_rq(struct rt_bandwidth *rt_b, int cpu) d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 658 { d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 659 return &cpu_rq(cpu)->rt; d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 660 } d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 661 ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 662 static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq) ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 663 { ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 664 return &def_rt_bandwidth; ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 665 } ac086bc22997a2 kernel/sched_rt.c Peter Zijlstra 2008-04-19 666 55e12e5e7b1d7e kernel/sched_rt.c Dhaval Giani 2008-06-24 667 #endif /* CONFIG_RT_GROUP_SCHED */ d0b27fa77854b1 kernel/sched_rt.c Peter Zijlstra 2008-04-19 668 faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 @669 bool sched_rt_bandwidth_account(struct rt_rq *rt_rq) faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 670 { faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 671 struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq); faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 672 faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 673 return (hrtimer_active(&rt_b->rt_period_timer) || faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 674 rt_rq->rt_time < rt_b->rt_runtime); faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 675 } faa5993736d9b4 kernel/sched/rt.c Juri Lelli 2014-02-21 676 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org