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xen: add steal_clock support on x86
The pv_time_ops structure contains a function pointer for the "steal_clock" functionality used only by KVM and Xen on ARM. Xen on x86 uses its own mechanism to account for the "stolen" time a thread wasn't able to run due to hypervisor scheduling. Add support in Xen arch independent time handling for this feature by moving it out of the arm arch into drivers/xen and remove the x86 Xen hack. Signed-off-by: Juergen Gross <email@example.com> Reviewed-by: Boris Ostrovsky <firstname.lastname@example.org> Reviewed-by: Stefano Stabellini <email@example.com> Signed-off-by: David Vrabel <firstname.lastname@example.org>
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