From 1e052a16eb2caf6727b594cad0744ccdfddf4254 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Sun, 30 Apr 2017 16:21:17 -0700 Subject: [PATCH] Drivers: hv: util: Make hv_poll_channel() a little more efficient The current code unconditionally sends an IPI. If we are running on the correct CPU and are in interrupt level, we don't need an IPI. Make this adjustment. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hyperv_vmbus.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 6113e915c50e..fa514be7679c 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -411,6 +411,10 @@ static inline void hv_poll_channel(struct vmbus_channel *channel, if (!channel) return; + if (in_interrupt() && (channel->target_cpu == smp_processor_id())) { + cb(channel); + return; + } smp_call_function_single(channel->target_cpu, cb, channel, true); } -- 2.20.1