Messages in this thread | | | Date | Tue, 3 Feb 2015 11:05:15 +0000 | From | David Vrabel <> | Subject | Re: [Xen-devel] [PATCH v5 1/2] xen: add xen_is_preemptible_hypercall() |
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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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