linux-kernel - Re: [PATCH 3/4] kvm: Replace vcpu->swait with rcuwait

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Date:   Wed, 25 Mar 2020 00:47:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     kbuild-all@...ts.01.org, tglx@...utronix.de, pbonzini@...hat.com,
        bigeasy@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        torvalds@...ux-foundation.org, will@...nel.org,
        joel@...lfernandes.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, dave@...olabs.net,
        Paul Mackerras <paulus@...abs.org>,
        kvmarm@...ts.cs.columbia.edu, linux-mips@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 3/4] kvm: Replace vcpu->swait with rcuwait

Hi Davidlohr,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20200323]
[also build test ERROR on v5.6-rc7]
[cannot apply to kvm/linux-next kvmarm/next linus/master kvm-ppc/kvm-ppc-next v5.6-rc7 v5.6-rc6 v5.6-rc5]
[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/Davidlohr-Bueso/kvm-Use-rcuwait-for-vcpu-blocking/20200324-155230
base:    5149100c3aebe5e640d6ff68e0b5e5a7eb8638e0
config: i386-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All errors (new ones prefixed by >>):

   arch/x86/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_vcpu_block':
>> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2698:16: error: macro "rcuwait_wait_event" passed 3 arguments, but takes just 2
          TASK_IDLE);
                   ^
>> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2696:2: error: 'rcuwait_wait_event' undeclared (first use in this function); did you mean 'rcuwait_wake_up'?
     rcuwait_wait_event(&vcpu->wait,
     ^~~~~~~~~~~~~~~~~~
     rcuwait_wake_up
   arch/x86/kvm/../../../virt/kvm/kvm_main.c:2696:2: note: each undeclared identifier is reported only once for each function it appears in

vim +/rcuwait_wait_event +2698 arch/x86/kvm/../../../virt/kvm/kvm_main.c

  2664	
  2665	/*
  2666	 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
  2667	 */
  2668	void kvm_vcpu_block(struct kvm_vcpu *vcpu)
  2669	{
  2670		ktime_t start, cur;
  2671		u64 block_ns;
  2672		int block_check = -EINTR;
  2673	
  2674		kvm_arch_vcpu_blocking(vcpu);
  2675	
  2676		start = cur = ktime_get();
  2677		if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
  2678			ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
  2679	
  2680			++vcpu->stat.halt_attempted_poll;
  2681			do {
  2682				/*
  2683				 * This sets KVM_REQ_UNHALT if an interrupt
  2684				 * arrives.
  2685				 */
  2686				if (kvm_vcpu_check_block(vcpu) < 0) {
  2687					++vcpu->stat.halt_successful_poll;
  2688					if (!vcpu_valid_wakeup(vcpu))
  2689						++vcpu->stat.halt_poll_invalid;
  2690					goto out;
  2691				}
  2692				cur = ktime_get();
  2693			} while (single_task_running() && ktime_before(cur, stop));
  2694		}
  2695	
> 2696		rcuwait_wait_event(&vcpu->wait,
  2697				   (block_check = kvm_vcpu_check_block(vcpu)) < 0,
> 2698				   TASK_IDLE);
  2699		cur = ktime_get();
  2700	out:
  2701		kvm_arch_vcpu_unblocking(vcpu);
  2702		block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
  2703	
  2704		if (!kvm_arch_no_poll(vcpu)) {
  2705			if (!vcpu_valid_wakeup(vcpu)) {
  2706				shrink_halt_poll_ns(vcpu);
  2707			} else if (halt_poll_ns) {
  2708				if (block_ns <= vcpu->halt_poll_ns)
  2709					;
  2710				/* we had a long block, shrink polling */
  2711				else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
  2712					shrink_halt_poll_ns(vcpu);
  2713				/* we had a short halt and our poll time is too small */
  2714				else if (vcpu->halt_poll_ns < halt_poll_ns &&
  2715					block_ns < halt_poll_ns)
  2716					grow_halt_poll_ns(vcpu);
  2717			} else {
  2718				vcpu->halt_poll_ns = 0;
  2719			}
  2720		}
  2721	
  2722		trace_kvm_vcpu_wakeup(block_ns, !block_check, vcpu_valid_wakeup(vcpu));
  2723		kvm_arch_vcpu_block_finish(vcpu);
  2724	}
  2725	EXPORT_SYMBOL_GPL(kvm_vcpu_block);
  2726	

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

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