[PATCH 1/2] Drivers: hv: vmbus: Use get/put_cpu() in vmbus_connect()

[kys]

From: Dexuan Cui <de...@microsoft.com>

With CONFIG_DEBUG_PREEMPT=y, I always see this warning:
BUG: using smp_processor_id() in preemptible [00000000]

Fix the false warning by using get/put_cpu().

Here vmbus_connect() sends a message to the host and waits for the
host's response. The host will deliver the response message and an
interrupt on CPU msg->target_vcpu, and later the interrupt handler
will wake up vmbus_connect(). vmbus_connect() doesn't really have
to run on the same cpu as CPU msg->target_vcpu, so it's safe to
call put_cpu() just here.

Signed-off-by: Dexuan Cui <de...@microsoft.com>
Cc: sta...@vger.kernel.org
Cc: K. Y. Srinivasan <k...@microsoft.com>
Cc: Haiyang Zhang <haiya...@microsoft.com>
Cc: Stephen Hemminger <sthem...@microsoft.com>
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
---
 drivers/hv/connection.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index ced041899456..f4d08c8ac7f8 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -76,6 +76,7 @@ static int vmbus_negotiate_version(struct 
vmbus_channel_msginfo *msginfo,
                                        __u32 version)
 {
        int ret = 0;
+       unsigned int cur_cpu;
        struct vmbus_channel_initiate_contact *msg;
        unsigned long flags;
 
@@ -118,9 +119,10 @@ static int vmbus_negotiate_version(struct 
vmbus_channel_msginfo *msginfo,
         * the CPU attempting to connect may not be CPU 0.
         */
        if (version >= VERSION_WIN8_1) {
-               msg->target_vcpu =
-                       hv_cpu_number_to_vp_number(smp_processor_id());
-               vmbus_connection.connect_cpu = smp_processor_id();
+               cur_cpu = get_cpu();
+               msg->target_vcpu = hv_cpu_number_to_vp_number(cur_cpu);
+               vmbus_connection.connect_cpu = cur_cpu;
+               put_cpu();
        } else {
                msg->target_vcpu = 0;
                vmbus_connection.connect_cpu = 0;
-- 
2.18.0