linux-kernel - Re: linux-next: build failure after merge of the kvm-fixes tree

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Date:   Thu, 27 May 2021 12:56:54 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, KVM <kvm@...r.kernel.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the kvm-fixes tree

On Thu, 27 May 2021 at 10:50, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> After merging the kvm-fixes tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
>
> In file included from arch/powerpc/include/asm/kvm_ppc.h:19,
>                  from arch/powerpc/include/asm/dbell.h:17,
>                  from arch/powerpc/kernel/asm-offsets.c:38:
> include/linux/kvm_host.h: In function 'kvm_vcpu_can_poll':
> include/linux/kvm_host.h:270:9: error: implicit declaration of function 'single_task_running' [-Werror=implicit-function-declaration]
>   270 |  return single_task_running() && !need_resched() && ktime_before(cur, stop);
>       |         ^~~~~~~~~~~~~~~~~~~
>
> Caused by commit
>
>   85d4c3baeb45 ("KVM: PPC: exit halt polling on need_resched()")
>
> I have used the kvm-fixes tree from next-20210524 again today.

The kvm/master is broken by several patches.

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 0f6f394..e851671 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1659,7 +1659,7 @@ struct kvm_hv_hcall {

 static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct
kvm_hv_hcall *hc, bool ex)
 {
-    int i, j;
+    int i;
     gpa_t gpa;
     struct kvm *kvm = vcpu->kvm;
     struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9d095bed..feb9611 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3604,7 +3604,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu,
struct msr_data *msr_info)
          * to ensure backwards-compatible behavior for migration.
          */
         if (msr_info->host_initiated &&
-            kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_TSC_HOST_ACCESS))
+            kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_TSC_HOST_ACCESS)) {
             offset = vcpu->arch.l1_tsc_offset;
             ratio = vcpu->arch.l1_tsc_scaling_ratio;
         } else {
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 18905c9..4273e04 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -10,6 +10,7 @@
 #include <linux/spinlock.h>
 #include <linux/signal.h>
 #include <linux/sched.h>
+#include <linux/sched/stat.h>
 #include <linux/bug.h>
 #include <linux/minmax.h>
 #include <linux/mm.h>