Fix below warning in Hyper-V drivers that comes when kernel is compiled
with W=1 option. Include export.h in driver files to fix it.
* warning: EXPORT_SYMBOL() is used, but #include <linux/export.h>
is missing

Signed-off-by: Naman Jain <redacted>
---
 drivers/hv/channel.c           | 1 +
 drivers/hv/channel_mgmt.c      | 1 +
 drivers/hv/hv_proc.c           | 1 +
 drivers/hv/mshv_common.c       | 1 +
 drivers/hv/mshv_root_hv_call.c | 1 +
 drivers/hv/ring_buffer.c       | 1 +
 6 files changed, 6 insertions(+)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 35f26fa1ffe7..7c7c66e0dc3f 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c

@@ -18,6 +18,7 @@
 #include <linux/uio.h>
 #include <linux/interrupt.h>
 #include <linux/set_memory.h>
+#include <linux/export.h>
 #include <asm/page.h>
 #include <asm/mshyperv.h>
 

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 6e084c207414..65dd299e2944 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c

@@ -20,6 +20,7 @@
 #include <linux/delay.h>
 #include <linux/cpu.h>
 #include <linux/hyperv.h>
+#include <linux/export.h>
 #include <asm/mshyperv.h>
 #include <linux/sched/isolation.h>
 

diff --git a/drivers/hv/hv_proc.c b/drivers/hv/hv_proc.c
index 7d7ecb6f6137..fbb4eb3901bb 100644
--- a/drivers/hv/hv_proc.c
+++ b/drivers/hv/hv_proc.c

@@ -6,6 +6,7 @@
 #include <linux/slab.h>
 #include <linux/cpuhotplug.h>
 #include <linux/minmax.h>
+#include <linux/export.h>
 #include <asm/mshyperv.h>
 
 /*

diff --git a/drivers/hv/mshv_common.c b/drivers/hv/mshv_common.c
index 2575e6d7a71f..6f227a8a5af7 100644
--- a/drivers/hv/mshv_common.c
+++ b/drivers/hv/mshv_common.c

@@ -13,6 +13,7 @@
 #include <linux/mm.h>
 #include <asm/mshyperv.h>
 #include <linux/resume_user_mode.h>
+#include <linux/export.h>
 
 #include "mshv.h"
 

diff --git a/drivers/hv/mshv_root_hv_call.c b/drivers/hv/mshv_root_hv_call.c
index a222a16107f6..c9c274f29c3c 100644
--- a/drivers/hv/mshv_root_hv_call.c
+++ b/drivers/hv/mshv_root_hv_call.c

@@ -9,6 +9,7 @@
 
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/export.h>
 #include <asm/mshyperv.h>
 
 #include "mshv_root.h"

diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 3c9b02471760..23ce1fb70de1 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c

@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/prefetch.h>
 #include <linux/io.h>
+#include <linux/export.h>
 #include <asm/mshyperv.h>
 
 #include "hyperv_vmbus.h"