On 27/01/15 01:51, Luis R. Rodriguez wrote:
>
> +#ifndef CONFIG_PREEMPT
> +extern struct { char _entry[32]; } preemptible_hypercall_page[];
> +
> +static inline bool xen_is_preemptible_hypercall(struct pt_regs *regs)
> +{
> + return !user_mode_vm(regs) &&
> + regs->ip >= (unsigned long)preemptible_hypercall_page &&
> + regs->ip < (unsigned long)preemptible_hypercall_page +
> PAGE_SIZE;
I asked for this test to be optimized.
return (regs->ip >> PAGE_SHIFT)
== ((unsigned long)preemptible_hypercall_page >> PAGE_SHIFT)
&& !user_mode_vm(regs);
David
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