On Mon, Jun 27, 2016 at 01:41:28PM -0400, Pan Xinhui wrote:
> 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....@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
> +I think you are missing Peter's comment here. We can #ifndef vcpu_is_preempted #define vcpu_is_preempted(cpu) fasle #endif And different archs implement their own versions of vcpu_is_preempted(), IOW, no need for an arch_vcpu_is_preempted(). Regards, Boqun > 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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