linux-kernel - [luto:sched/lazymm 11/16] kernel/sched/idle.c:288: undefined reference to `unlazy_mm_irqs

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Date:   Wed, 17 Nov 2021 17:56:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [luto:sched/lazymm 11/16] kernel/sched/idle.c:288: undefined
 reference to `unlazy_mm_irqs_off'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git sched/lazymm
head:   c0d03d4f2778fd0a7c16e69cdfb3f111296129b5
commit: 23ef8314367945e2dd63230fb1c2ebb7e148fe48 [11/16] Rework "sched/core: Fix illegal RCU from offline CPUs"
config: i386-randconfig-c021-20211117 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id=23ef8314367945e2dd63230fb1c2ebb7e148fe48
        git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
        git fetch --no-tags luto sched/lazymm
        git checkout 23ef8314367945e2dd63230fb1c2ebb7e148fe48
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   ld: kernel/sched/idle.o: in function `do_idle':
>> kernel/sched/idle.c:288: undefined reference to `unlazy_mm_irqs_off'


vim +288 kernel/sched/idle.c

   255	
   256	/*
   257	 * Generic idle loop implementation
   258	 *
   259	 * Called with polling cleared.
   260	 */
   261	static void do_idle(void)
   262	{
   263		int cpu = smp_processor_id();
   264	
   265		/*
   266		 * Check if we need to update blocked load
   267		 */
   268		nohz_run_idle_balance(cpu);
   269	
   270		/*
   271		 * If the arch has a polling bit, we maintain an invariant:
   272		 *
   273		 * Our polling bit is clear if we're not scheduled (i.e. if rq->curr !=
   274		 * rq->idle). This means that, if rq->idle has the polling bit set,
   275		 * then setting need_resched is guaranteed to cause the CPU to
   276		 * reschedule.
   277		 */
   278	
   279		__current_set_polling();
   280		tick_nohz_idle_enter();
   281	
   282		while (!need_resched()) {
   283			rmb();
   284	
   285			local_irq_disable();
   286	
   287			if (cpu_is_offline(cpu)) {
 > 288				unlazy_mm_irqs_off();
   289				tick_nohz_idle_stop_tick();
   290				cpuhp_report_idle_dead();
   291				arch_cpu_idle_dead();
   292			}
   293	
   294			arch_cpu_idle_enter();
   295			rcu_nocb_flush_deferred_wakeup();
   296	
   297			/*
   298			 * In poll mode we reenable interrupts and spin. Also if we
   299			 * detected in the wakeup from idle path that the tick
   300			 * broadcast device expired for us, we don't want to go deep
   301			 * idle as we know that the IPI is going to arrive right away.
   302			 */
   303			if (cpu_idle_force_poll || tick_check_broadcast_expired()) {
   304				tick_nohz_idle_restart_tick();
   305				cpu_idle_poll();
   306			} else {
   307				cpuidle_idle_call();
   308			}
   309			arch_cpu_idle_exit();
   310		}
   311	
   312		/*
   313		 * Since we fell out of the loop above, we know TIF_NEED_RESCHED must
   314		 * be set, propagate it into PREEMPT_NEED_RESCHED.
   315		 *
   316		 * This is required because for polling idle loops we will not have had
   317		 * an IPI to fold the state for us.
   318		 */
   319		preempt_set_need_resched();
   320		tick_nohz_idle_exit();
   321		__current_clr_polling();
   322	
   323		/*
   324		 * We promise to call sched_ttwu_pending() and reschedule if
   325		 * need_resched() is set while polling is set. That means that clearing
   326		 * polling needs to be visible before doing these things.
   327		 */
   328		smp_mb__after_atomic();
   329	
   330		/*
   331		 * RCU relies on this call to be done outside of an RCU read-side
   332		 * critical section.
   333		 */
   334		flush_smp_call_function_from_idle();
   335		schedule_idle();
   336	
   337		if (unlikely(klp_patch_pending(current)))
   338			klp_update_patch_state(current);
   339	}
   340	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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