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[PATCH 1/3] kernel/sched: introduce vcpu preempted check interface

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this supports to fix lock holder preempted issue which run as a guest

for kernel users, we could use bool vcpu_is_preempted(int cpu) to detech
if one vcpu is preempted or not.

The default implementation is a macrodefined by false. So compiler can
wrap it out if arch dose not support such vcpu pteempted check.

archs can implement it by define arch_vcpu_is_preempted().

Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
---
 include/linux/sched.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6e42ada..dc0a9c3 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -3293,6 +3293,15 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
 
 #endif /* CONFIG_SMP */
 
+#ifdef arch_vcpu_is_preempted
+static inline bool vcpu_is_preempted(int cpu)
+{
+	return arch_vcpu_is_preempted(cpu);
+}
+#else
+#define vcpu_is_preempted(cpu)	false
+#endif
+
 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
 
-- 
2.4.11

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[PATCH 0/3] implement vcpu preempted check Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-27 15:50 +0200
  [PATCH 2/3] powerpc/spinlock: support vcpu preempted check Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-27 15:50 +0200
    Re: [PATCH 2/3] powerpc/spinlock: support vcpu preempted check Peter Zijlstra <peterz@infradead.org> - 2016-06-27 16:20 +0200
      Re: [PATCH 2/3] powerpc/spinlock: support vcpu preempted check xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-28 05:30 +0200
    Re: [PATCH 2/3] powerpc/spinlock: support vcpu preempted check Boqun Feng <boqun.feng@gmail.com> - 2016-06-27 17:00 +0200
      Re: [PATCH 2/3] powerpc/spinlock: support vcpu preempted check xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-28 05:50 +0200
        Re: [PATCH 2/3] powerpc/spinlock: support vcpu preempted check Boqun Feng <boqun.feng@gmail.com> - 2016-06-28 07:10 +0200
          Re: [PATCH 2/3] powerpc/spinlock: support vcpu preempted check xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-28 07:40 +0200
  [PATCH 1/3] kernel/sched: introduce vcpu preempted check interface Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-27 15:50 +0200
    Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check  interface Peter Zijlstra <peterz@infradead.org> - 2016-06-27 16:10 +0200
      Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check  interface Peter Zijlstra <peterz@infradead.org> - 2016-06-27 16:10 +0200
        Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check interface xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-28 05:20 +0200
      Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check  interface Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-06-28 09:10 +0200
        Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check interface xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-28 11:50 +0200
    Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check  interface Boqun Feng <boqun.feng@gmail.com> - 2016-06-27 16:10 +0200
      Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check interface xinhui <xinhui.pan@linux.vnet.ibm.com> - 2016-06-28 05:20 +0200

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