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Drivers: hv: util: Make hv_poll_channel() a little more efficient

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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 <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2017-04-30 16:21:17 -07:00 • committed by Greg Kroah-Hartman
parent 48f4ccdfc4
commit 1e052a16eb
1 changed files with 4 additions and 0 deletions
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4
drivers/hv/hyperv_vmbus.h
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@ -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);
}