tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core-sched head: b417ddaf222294bcc35e9857105ab37d9b0fd715 commit: 7841ce54261f3c407cf52de13712261521ae9403 [27/29] sched: Cgroup core-scheduling interface config: powerpc64-randconfig-r002-20210414 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9829f5e6b1bca9b61efc629770d28bb9014dec45) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue sched/core-sched git checkout 7841ce54261f3c407cf52de13712261521ae9403 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=powerpc64 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 >>): #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/core.c:10: In file included from include/trace/events/sched.h:740: In file included from include/trace/define_trace.h:102: In file included from include/trace/trace_events.h:21: In file included from include/linux/trace_events.h:9: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:97:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/core.c:10: In file included from include/trace/events/sched.h:740: In file included from include/trace/define_trace.h:102: In file included from include/trace/trace_events.h:21: In file included from include/linux/trace_events.h:9: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:99:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/core.c:10: In file included from include/trace/events/sched.h:740: In file included from include/trace/define_trace.h:102: In file included from include/trace/trace_events.h:21: In file included from include/linux/trace_events.h:9: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:101:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/sched/core.c:10: In file included from include/trace/events/sched.h:740: In file included from include/trace/define_trace.h:102: In file included from include/trace/trace_events.h:21: In file included from include/linux/trace_events.h:9: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:103:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ kernel/sched/core.c:9359:2: error: implicit declaration of function 'sched_core_cgroup_free' [-Werror,-Wimplicit-function-declaration] sched_core_cgroup_free(tg); ^ kernel/sched/core.c:9359:2: note: did you mean 'sched_core_free'? include/linux/sched.h:2176:20: note: 'sched_core_free' declared here static inline void sched_core_free(struct task_struct *tsk) { } ^ kernel/sched/core.c:9404:2: error: implicit declaration of function 'sched_core_cgroup_online' [-Werror,-Wimplicit-function-declaration] sched_core_cgroup_online(parent, tg); ^ cookie = sched_core_cgroup_cookie(tsk->sched_task_group); ^ kernel/sched/core.c:9498:11: error: implicit declaration of function 'sched_core_update_cookie' [-Werror,-Wimplicit-function-declaration] cookie = sched_core_update_cookie(tsk, cookie); ^ kernel/sched/core.c:9498:11: note: did you mean 'sched_core_cgroup_cookie'? kernel/sched/core.c:9497:11: note: 'sched_core_cgroup_cookie' declared here cookie = sched_core_cgroup_cookie(tsk->sched_task_group); ^ kernel/sched/core.c:9499:2: error: implicit declaration of function 'sched_core_put_cookie' [-Werror,-Wimplicit-function-declaration] sched_core_put_cookie(cookie); ^ kernel/sched/core.c:9499:2: note: did you mean 'sched_core_update_cookie'? kernel/sched/core.c:9498:11: note: 'sched_core_update_cookie' declared here cookie = sched_core_update_cookie(tsk, cookie); ^ 12 warnings and 5 errors generated. vim +/sched_core_cgroup_cookie +9497 kernel/sched/core.c 9353 9354 static void sched_free_group(struct task_group *tg) 9355 { 9356 free_fair_sched_group(tg); 9357 free_rt_sched_group(tg); 9358 autogroup_free(tg); 9360 kmem_cache_free(task_group_cache, tg); 9361 } 9362 9363 /* allocate runqueue etc for a new task group */ 9364 struct task_group *sched_create_group(struct task_group *parent) 9365 { 9366 struct task_group *tg; 9367 9368 tg = kmem_cache_alloc(task_group_cache, GFP_KERNEL | __GFP_ZERO); 9369 if (!tg) 9370 return ERR_PTR(-ENOMEM); 9371 9372 if (!alloc_fair_sched_group(tg, parent)) 9373 goto err; 9374 9375 if (!alloc_rt_sched_group(tg, parent)) 9376 goto err; 9377 9378 alloc_uclamp_sched_group(tg, parent); 9379 9380 return tg; 9381 9382 err: 9383 sched_free_group(tg); 9384 return ERR_PTR(-ENOMEM); 9385 } 9386 9387 void sched_online_group(struct task_group *tg, struct task_group *parent) 9388 { 9389 unsigned long flags; 9390 9391 spin_lock_irqsave(&task_group_lock, flags); 9392 list_add_rcu(&tg->list, &task_groups); 9393 9394 /* Root should already exist: */ 9395 WARN_ON(!parent); 9396 9397 tg->parent = parent; 9398 INIT_LIST_HEAD(&tg->children); 9399 list_add_rcu(&tg->siblings, &parent->children); 9400 spin_unlock_irqrestore(&task_group_lock, flags); 9401 9402 online_fair_sched_group(tg); 9403 9404 sched_core_cgroup_online(parent, tg); 9405 } 9406 9407 /* rcu callback to free various structures associated with a task group */ 9408 static void sched_free_group_rcu(struct rcu_head *rhp) 9409 { 9410 /* Now it should be safe to free those cfs_rqs: */ 9411 sched_free_group(container_of(rhp, struct task_group, rcu)); 9412 } 9413 9414 void sched_destroy_group(struct task_group *tg) 9415 { 9416 /* Wait for possible concurrent references to cfs_rqs complete: */ 9417 call_rcu(&tg->rcu, sched_free_group_rcu); 9418 } 9419 9420 void sched_offline_group(struct task_group *tg) 9421 { 9422 unsigned long flags; 9423 9424 /* End participation in shares distribution: */ 9425 unregister_fair_sched_group(tg); 9426 9427 spin_lock_irqsave(&task_group_lock, flags); 9428 list_del_rcu(&tg->list); 9429 list_del_rcu(&tg->siblings); 9430 spin_unlock_irqrestore(&task_group_lock, flags); 9431 } 9432 9433 static void sched_change_group(struct task_struct *tsk, int type) 9434 { 9435 struct task_group *tg; 9436 9437 /* 9438 * All callers are synchronized by task_rq_lock(); we do not use RCU 9439 * which is pointless here. Thus, we pass "true" to task_css_check() 9440 * to prevent lockdep warnings. 9441 */ 9442 tg = container_of(task_css_check(tsk, cpu_cgrp_id, true), 9443 struct task_group, css); 9444 tg = autogroup_task_group(tsk, tg); 9445 tsk->sched_task_group = tg; 9446 9447 #ifdef CONFIG_FAIR_GROUP_SCHED 9448 if (tsk->sched_class->task_change_group) 9449 tsk->sched_class->task_change_group(tsk, type); 9450 else 9451 #endif 9452 set_task_rq(tsk, task_cpu(tsk)); 9453 } 9454 9455 /* 9456 * Change task's runqueue when it moves between groups. 9457 * 9458 * The caller of this function should have put the task in its new group by 9459 * now. This function just updates tsk->se.cfs_rq and tsk->se.parent to reflect 9460 * its new group. 9461 */ 9462 void sched_move_task(struct task_struct *tsk) 9463 { 9464 int queued, running, queue_flags = 9465 DEQUEUE_SAVE | DEQUEUE_MOVE | DEQUEUE_NOCLOCK; 9466 unsigned long cookie; 9467 struct rq_flags rf; 9468 struct rq *rq; 9469 9470 rq = task_rq_lock(tsk, &rf); 9471 update_rq_clock(rq); 9472 9473 running = task_current(rq, tsk); 9474 queued = task_on_rq_queued(tsk); 9475 9476 if (queued) 9477 dequeue_task(rq, tsk, queue_flags); 9478 if (running) 9479 put_prev_task(rq, tsk); 9480 9481 sched_change_group(tsk, TASK_MOVE_GROUP); 9482 9483 if (queued) 9484 enqueue_task(rq, tsk, queue_flags); 9485 if (running) { 9486 set_next_task(rq, tsk); 9487 /* 9488 * After changing group, the running task may have joined a 9489 * throttled one but it's still the running task. Trigger a 9490 * resched to make sure that task can still run. 9491 */ 9492 resched_curr(rq); 9493 } 9494 9495 task_rq_unlock(rq, tsk, &rf); 9496 9498 cookie = sched_core_update_cookie(tsk, cookie); 9499 sched_core_put_cookie(cookie); 9500 } 9501 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org