[PATCH 3/3] drm/amdgpu: move function declaration to header file

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We get 1 warning when building kernel with W=1:
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c:37:6: warning: no previous prototype for 'amdgpu_pm_acpi_event_handler' [-Wmissing-prototypes]

In fact, this function is defined in
drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c, but should be declared
in a header file. So this patch moves the function declaration
to drivers/gpu/drm/amd/amdgpu/amdgpu.h.

Signed-off-by: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h      | 2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 1 -
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 039b57e..c0bc42b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -2145,6 +2145,8 @@ void amdgpu_io_wreg(struct amdgpu_device *adev, u32 reg, u32 v);
 u32 amdgpu_mm_rdoorbell(struct amdgpu_device *adev, u32 index);
 void amdgpu_mm_wdoorbell(struct amdgpu_device *adev, u32 index, u32 v);
 
+void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev);
+
 /*
  * Registers read & write functions.
  */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 5796539..d77d630 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -33,7 +33,6 @@
 #include "amd_acpi.h"
 #include "atom.h"
 
-extern void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev);
 /* Call the ATIF method
  */
 /**
-- 
2.7.4

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