On Tue, Feb 03, 2015 at 11:05:15AM +, David Vrabel wrote:
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);
It didn't seem you were so sure about it and I asked some
clarifications about it but you had not replied:
http://www.gossamer-threads.com/lists/xen/devel/363565?page=last
Luis
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