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The recent move of hv_do_rep_hypercall() to this file adds a reference to touch_nmi_watchdog(). Its function definition is included indirectly when compiled on x86, but not when compiled on ARM64. So add the explicit #include. No functional change. Signed-off-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/1626058204-2106-1-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org>