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With the intent to provide local_clock_noinstr(), a variant of local_clock() that's safe to be called from noinstr code (with the assumption that any such code will already be non-preemptible), prepare for things by making the Hyper-V TSC and MSR sched_clock implementations noinstr. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Co-developed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Michael Kelley <mikelley@microsoft.com> # Hyper-V Link: https://lore.kernel.org/r/20230519102715.843039089@infradead.org