[PATCH 0/6] Fix warning for missing export.h in Hyper-V drivers

[PATCH 0/6] Fix warning for missing export.h in Hyper-V drivers

[Naman Jain]

When the kernel is compiled with W=1 option, a warning is reported
if a .c file exports a symbol but does not include export.h header
file. This warning was added in below patch, which merged recently:
commit a934a57a42f6 ("scripts/misc-check: check missing #include <linux/export.h> when W=1")

Fix this issue in Hyper-V drivers. This does not bring any
functional changes.

The one in drivers/hv/vmbus_drv.c is going to be fixed with 
https://lore.kernel.org/all/20250611072704.83199-2-namjain@linux.microsoft.com/
so it is not included in this series.

Naman Jain (6):
  Drivers: hv: Fix warnings for missing export.h header inclusion
  x86/hyperv: Fix warnings for missing export.h header inclusion
  KVM: x86: hyper-v: Fix warnings for missing export.h header inclusion
  clocksource: hyper-v: Fix warnings for missing export.h header
    inclusion
  PCI: hv: Fix warnings for missing export.h header inclusion
  net: mana: Fix warnings for missing export.h header inclusion

 arch/x86/hyperv/hv_init.c                       | 1 +
 arch/x86/hyperv/irqdomain.c                     | 1 +
 arch/x86/hyperv/ivm.c                           | 1 +
 arch/x86/hyperv/nested.c                        | 1 +
 arch/x86/kvm/hyperv.c                           | 1 +
 arch/x86/kvm/kvm_onhyperv.c                     | 1 +
 drivers/clocksource/hyperv_timer.c              | 1 +
 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 +
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 1 +
 drivers/net/ethernet/microsoft/mana/mana_en.c   | 1 +
 drivers/pci/controller/pci-hyperv-intf.c        | 1 +
 16 files changed, 16 insertions(+)


base-commit: 475c850a7fdd0915b856173186d5922899d65686
-- 
2.34.1

[PATCH 1/6] Drivers: hv: Fix warnings for missing export.h header inclusion

[Naman Jain]

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 <namjain@linux.microsoft.com>
---
 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"
-- 
2.34.1

[PATCH 2/6] x86/hyperv: Fix warnings for missing export.h header inclusion

[Naman Jain]

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 <namjain@linux.microsoft.com>
---
 arch/x86/hyperv/hv_init.c   | 1 +
 arch/x86/hyperv/irqdomain.c | 1 +
 arch/x86/hyperv/ivm.c       | 1 +
 arch/x86/hyperv/nested.c    | 1 +
 4 files changed, 4 insertions(+)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 3d1d3547095a..afdbda2dd7b7 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -34,6 +34,7 @@
 #include <linux/syscore_ops.h>
 #include <clocksource/hyperv_timer.h>
 #include <linux/highmem.h>
+#include <linux/export.h>
 
 void *hv_hypercall_pg;
 EXPORT_SYMBOL_GPL(hv_hypercall_pg);
diff --git a/arch/x86/hyperv/irqdomain.c b/arch/x86/hyperv/irqdomain.c
index 31f0d29cbc5e..f7627bc8fe49 100644
--- a/arch/x86/hyperv/irqdomain.c
+++ b/arch/x86/hyperv/irqdomain.c
@@ -10,6 +10,7 @@
 
 #include <linux/pci.h>
 #include <linux/irq.h>
+#include <linux/export.h>
 #include <asm/mshyperv.h>
 
 static int hv_map_interrupt(union hv_device_id device_id, bool level,
diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c
index e93a2f488ff7..ade6c665c97e 100644
--- a/arch/x86/hyperv/ivm.c
+++ b/arch/x86/hyperv/ivm.c
@@ -10,6 +10,7 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/cpu.h>
+#include <linux/export.h>
 #include <asm/svm.h>
 #include <asm/sev.h>
 #include <asm/io.h>
diff --git a/arch/x86/hyperv/nested.c b/arch/x86/hyperv/nested.c
index 1083dc8646f9..8ccbb7c4fc27 100644
--- a/arch/x86/hyperv/nested.c
+++ b/arch/x86/hyperv/nested.c
@@ -11,6 +11,7 @@
 
 
 #include <linux/types.h>
+#include <linux/export.h>
 #include <hyperv/hvhdk.h>
 #include <asm/mshyperv.h>
 #include <asm/tlbflush.h>
-- 
2.34.1

[PATCH 3/6] KVM: x86: hyper-v: Fix warnings for missing export.h header inclusion

[Naman Jain]

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 <namjain@linux.microsoft.com>
---
 arch/x86/kvm/hyperv.c       | 1 +
 arch/x86/kvm/kvm_onhyperv.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 24f0318c50d7..09f9de4555dd 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -33,6 +33,7 @@
 #include <linux/sched/cputime.h>
 #include <linux/spinlock.h>
 #include <linux/eventfd.h>
+#include <linux/export.h>
 
 #include <asm/apicdef.h>
 #include <asm/mshyperv.h>
diff --git a/arch/x86/kvm/kvm_onhyperv.c b/arch/x86/kvm/kvm_onhyperv.c
index ded0bd688c65..ba45f8364187 100644
--- a/arch/x86/kvm/kvm_onhyperv.c
+++ b/arch/x86/kvm/kvm_onhyperv.c
@@ -5,6 +5,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/kvm_host.h>
+#include <linux/export.h>
 #include <asm/mshyperv.h>
 
 #include "hyperv.h"
-- 
2.34.1

[PATCH 4/6] clocksource: hyper-v: Fix warnings for missing export.h header inclusion

[Naman Jain]

Fix below warning in Hyper-V clocksource driver 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 <namjain@linux.microsoft.com>
---
 drivers/clocksource/hyperv_timer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index 09549451dd51..2edc13ca184e 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -22,6 +22,7 @@
 #include <linux/irq.h>
 #include <linux/acpi.h>
 #include <linux/hyperv.h>
+#include <linux/export.h>
 #include <clocksource/hyperv_timer.h>
 #include <hyperv/hvhdk.h>
 #include <asm/mshyperv.h>
-- 
2.34.1

[PATCH 5/6] PCI: hv: Fix warnings for missing export.h header inclusion

[Naman Jain]

Fix below warning in Hyper-V PCI driver 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 <namjain@linux.microsoft.com>
---
 drivers/pci/controller/pci-hyperv-intf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/pci-hyperv-intf.c b/drivers/pci/controller/pci-hyperv-intf.c
index cc96be450360..28b3e93d31c0 100644
--- a/drivers/pci/controller/pci-hyperv-intf.c
+++ b/drivers/pci/controller/pci-hyperv-intf.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/hyperv.h>
+#include <linux/export.h>
 
 struct hyperv_pci_block_ops hvpci_block_ops;
 EXPORT_SYMBOL_GPL(hvpci_block_ops);
-- 
2.34.1

[PATCH 6/6] net: mana: Fix warnings for missing export.h header inclusion

[Naman Jain]

Fix below warning in Hyper-V's MANA 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 <namjain@linux.microsoft.com>
---
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 1 +
 drivers/net/ethernet/microsoft/mana/mana_en.c   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 3504507477c6..019e32b60043 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -6,6 +6,7 @@
 #include <linux/pci.h>
 #include <linux/utsname.h>
 #include <linux/version.h>
+#include <linux/export.h>
 
 #include <net/mana/mana.h>
 
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index ccd2885c939e..faad1cb880f8 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -10,6 +10,7 @@
 #include <linux/filter.h>
 #include <linux/mm.h>
 #include <linux/pci.h>
+#include <linux/export.h>
 
 #include <net/checksum.h>
 #include <net/ip6_checksum.h>
-- 
2.34.1

Re: [PATCH 0/6] Fix warning for missing export.h in Hyper-V drivers

[Saurabh Singh Sengar]

On Wed, Jun 11, 2025 at 03:34:53PM +0530, Naman Jain wrote:
> When the kernel is compiled with W=1 option, a warning is reported
> if a .c file exports a symbol but does not include export.h header
> file. This warning was added in below patch, which merged recently:
> commit a934a57a42f6 ("scripts/misc-check: check missing #include <linux/export.h> when W=1")
> 
> Fix this issue in Hyper-V drivers. This does not bring any
> functional changes.
> 
> The one in drivers/hv/vmbus_drv.c is going to be fixed with 
> https://lore.kernel.org/all/20250611072704.83199-2-namjain@linux.microsoft.com/
> so it is not included in this series.
> 
> Naman Jain (6):
>   Drivers: hv: Fix warnings for missing export.h header inclusion
>   x86/hyperv: Fix warnings for missing export.h header inclusion
>   KVM: x86: hyper-v: Fix warnings for missing export.h header inclusion
>   clocksource: hyper-v: Fix warnings for missing export.h header
>     inclusion
>   PCI: hv: Fix warnings for missing export.h header inclusion
>   net: mana: Fix warnings for missing export.h header inclusion
> 
>  arch/x86/hyperv/hv_init.c                       | 1 +
>  arch/x86/hyperv/irqdomain.c                     | 1 +
>  arch/x86/hyperv/ivm.c                           | 1 +
>  arch/x86/hyperv/nested.c                        | 1 +
>  arch/x86/kvm/hyperv.c                           | 1 +
>  arch/x86/kvm/kvm_onhyperv.c                     | 1 +
>  drivers/clocksource/hyperv_timer.c              | 1 +
>  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 +
>  drivers/net/ethernet/microsoft/mana/gdma_main.c | 1 +
>  drivers/net/ethernet/microsoft/mana/mana_en.c   | 1 +
>  drivers/pci/controller/pci-hyperv-intf.c        | 1 +
>  16 files changed, 16 insertions(+)
> 
> 
> base-commit: 475c850a7fdd0915b856173186d5922899d65686
> -- 
> 2.34.1
>

For the series,
Reviewed-by: Saurabh Sengar <ssengar@linux.microsoft.com> 

Re: [PATCH 3/6] KVM: x86: hyper-v: Fix warnings for missing export.h header inclusion

[Sean Christopherson]

On Wed, Jun 11, 2025, Naman Jain wrote:
> Fix below warning in Hyper-V drivers

KVM is quite obviously not a Hyper-V driver.

> 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

NAK.  I agree with Heiko[*], this is absurd.  And if the W=1 change isn't reverted
for some reason, I'd rather "fix" all of KVM in one shot, not update random files
just because of their name.

Sorry.

[*] https://lore.kernel.org/all/20250611075533.8102A57-hca@linux.ibm.com

> Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
> ---
>  arch/x86/kvm/hyperv.c       | 1 +
>  arch/x86/kvm/kvm_onhyperv.c | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
> index 24f0318c50d7..09f9de4555dd 100644
> --- a/arch/x86/kvm/hyperv.c
> +++ b/arch/x86/kvm/hyperv.c
> @@ -33,6 +33,7 @@
>  #include <linux/sched/cputime.h>
>  #include <linux/spinlock.h>
>  #include <linux/eventfd.h>
> +#include <linux/export.h>
>  
>  #include <asm/apicdef.h>
>  #include <asm/mshyperv.h>
> diff --git a/arch/x86/kvm/kvm_onhyperv.c b/arch/x86/kvm/kvm_onhyperv.c
> index ded0bd688c65..ba45f8364187 100644
> --- a/arch/x86/kvm/kvm_onhyperv.c
> +++ b/arch/x86/kvm/kvm_onhyperv.c
> @@ -5,6 +5,7 @@
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
>  #include <linux/kvm_host.h>
> +#include <linux/export.h>
>  #include <asm/mshyperv.h>
>  
>  #include "hyperv.h"
> -- 
> 2.34.1
> 

Re: [PATCH 1/6] Drivers: hv: Fix warnings for missing export.h header inclusion

[Nuno Das Neves]

On 6/11/2025 3:04 AM, Naman Jain wrote:
> 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 <namjain@linux.microsoft.com>
> ---
>  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"

Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>

Re: [PATCH 3/6] KVM: x86: hyper-v: Fix warnings for missing export.h header inclusion

[Naman Jain]

On 6/11/2025 6:28 PM, Sean Christopherson wrote:
> On Wed, Jun 11, 2025, Naman Jain wrote:
>> Fix below warning in Hyper-V drivers
> 
> KVM is quite obviously not a Hyper-V driver.
> 
>> 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
> 
> NAK.  I agree with Heiko[*], this is absurd.  And if the W=1 change isn't reverted
> for some reason, I'd rather "fix" all of KVM in one shot, not update random files
> just because of their name.
> 
> Sorry.
> 
> [*] https://lore.kernel.org/all/20250611075533.8102A57-hca@linux.ibm.com
> 

Sure, thanks for reviewing.

Regards,
Naman

>> Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
>> ---
>>   arch/x86/kvm/hyperv.c       | 1 +
>>   arch/x86/kvm/kvm_onhyperv.c | 1 +
>>   2 files changed, 2 insertions(+)
>>
>> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
>> index 24f0318c50d7..09f9de4555dd 100644
>> --- a/arch/x86/kvm/hyperv.c
>> +++ b/arch/x86/kvm/hyperv.c
>> @@ -33,6 +33,7 @@
>>   #include <linux/sched/cputime.h>
>>   #include <linux/spinlock.h>
>>   #include <linux/eventfd.h>
>> +#include <linux/export.h>
>>   
>>   #include <asm/apicdef.h>
>>   #include <asm/mshyperv.h>
>> diff --git a/arch/x86/kvm/kvm_onhyperv.c b/arch/x86/kvm/kvm_onhyperv.c
>> index ded0bd688c65..ba45f8364187 100644
>> --- a/arch/x86/kvm/kvm_onhyperv.c
>> +++ b/arch/x86/kvm/kvm_onhyperv.c
>> @@ -5,6 +5,7 @@
>>   #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>>   
>>   #include <linux/kvm_host.h>
>> +#include <linux/export.h>
>>   #include <asm/mshyperv.h>
>>   
>>   #include "hyperv.h"
>> -- 
>> 2.34.1
>>

Re: [PATCH 0/6] Fix warning for missing export.h in Hyper-V drivers

[Wei Liu]

On Wed, Jun 11, 2025 at 03:34:53PM +0530, Naman Jain wrote:
> When the kernel is compiled with W=1 option, a warning is reported
> if a .c file exports a symbol but does not include export.h header
> file. This warning was added in below patch, which merged recently:
> commit a934a57a42f6 ("scripts/misc-check: check missing #include <linux/export.h> when W=1")
> 
> Fix this issue in Hyper-V drivers. This does not bring any
> functional changes.
> 
> The one in drivers/hv/vmbus_drv.c is going to be fixed with 
> https://lore.kernel.org/all/20250611072704.83199-2-namjain@linux.microsoft.com/
> so it is not included in this series.
> 
> Naman Jain (6):
>   Drivers: hv: Fix warnings for missing export.h header inclusion
>   x86/hyperv: Fix warnings for missing export.h header inclusion
>   KVM: x86: hyper-v: Fix warnings for missing export.h header inclusion
>   clocksource: hyper-v: Fix warnings for missing export.h header
>     inclusion
>   PCI: hv: Fix warnings for missing export.h header inclusion
>   net: mana: Fix warnings for missing export.h header inclusion

I applied all patches expect the KVM one to hyperv-fixes. Thanks.

Re: [PATCH 4/6] clocksource: hyper-v: Fix warnings for missing export.h header inclusion

[Daniel Lezcano]

On Wed, Jun 11, 2025 at 03:34:57PM +0530, Naman Jain wrote:
> Fix below warning in Hyper-V clocksource driver 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 <namjain@linux.microsoft.com>
> ---
>  drivers/clocksource/hyperv_timer.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
> index 09549451dd51..2edc13ca184e 100644
> --- a/drivers/clocksource/hyperv_timer.c
> +++ b/drivers/clocksource/hyperv_timer.c
> @@ -22,6 +22,7 @@
>  #include <linux/irq.h>
>  #include <linux/acpi.h>
>  #include <linux/hyperv.h>
> +#include <linux/export.h>
>  #include <clocksource/hyperv_timer.h>
>  #include <hyperv/hvhdk.h>
>  #include <asm/mshyperv.h>

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>


> -- 
> 2.34.1
> 

-- 

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